ORIGINAL RESEARCH article
ZIF-12/Fe-Cu LDH Composite as a High Performance Electrocatalyst for Water Oxidation
- 1Catalysis and Nanomaterials Lab 27, Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
- 2Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, Pakistan
- 3Department of Chemistry, Faculty of Sciences, King Khalid University, Abha, Saudi Arabia
- 4Chemistry of Interfaces, Luleå University of Technology, Luleå, Sweden
Layered double hydroxides (LDH) are being used as electrocatalysts for oxygen evolution reactions (OERs). However, low current densities limit their practical applications. Herein, we report a facile and economic synthesis of an iron-copper based LDH integrated with a cobalt-based metal-organic framework (ZIF-12) to form LDH-ZIF-12 composite (1) through a co-precipitation method. The as-synthesized composite 1 requires a low overpotential of 337 mV to achieve a catalytic current density of 10 mA cm−2 with a Tafel slope of 89 mV dec−1. Tafel analysis further demonstrates that 1 exhibits a slope of 89 mV dec−1 which is much lower than the slope of 284 mV dec−1 for LDH and 172 mV dec−1 for ZIF-12. The slope value of 1 is also lower than previously reported electrocatalysts, including Ni-Co LDH (113 mV dec−1) and Zn-Co LDH nanosheets (101 mV dec−1), under similar conditions. Controlled potential electrolysis and stability test experiments show the potential application of 1 as a heterogeneous electrocatalyst for water oxidation.
Water is an important renewable energy source and has the potential to meet current energy crisis needs via photochemical, electrochemical, and photoelectrochemical splitting to produce oxygen and hydrogen green fuels (Conti et al., 2016; Shao et al., 2018). Oxygen evolution reaction (OER) is the most crucial reaction of water splitting. OER is considered as strenuous in contrast to HER due to sluggish kinetics (Walter et al., 2010; Man et al., 2011) since OER is a four electron process and involves simultaneous fragmentation of the O-H bond and formation of an O=O bond that needs 1.23 V vs RHE (Symes and Cronin, 2013).
Noble metals (such as Ir, Pt, and Ru) based heterogeneous and homogeneous electrocatalysts have been reported as benchmark electrocatalysts which show high activity and low overpotential values toward water oxidation. However, due to their scarcity, high cost, and instability in alkaline medium, commercial application of these precious metal catalysts is restricted (McCrory et al., 2013; Symes and Cronin, 2013; Lattach et al., 2014; Sheridan et al., 2015). Focus has now been given to the abundant and non-precious materials which can replace these benchmark electrocatalysts (Zhu et al., 2019). Diverse inorganic materials including metal oxides (Surendranath et al., 2009; Smith et al., 2013; McCrory et al., 2015; Yamada et al., 2020), amorphous materials (Zhou et al., 2013), perovskite structures (Kudo et al., 2000; Sabba et al., 2015; Jin and Bard, 2020a), hydro(oxy)oxide (Song and Hu, 2014), chalcogenides (Gao et al., 2012), olivines (Lee S. W. et al., 2012), and polyoxometalates (Stracke and Finke, 2011; Soriano-López et al., 2013; Han et al., 2014) have been explored as potential candidates for OER catalysis.
Layered double hydroxides (LDH), also known as hydrotalcite-like clays, have stacking of brucite octahedral layers. Space between the cationic layer host anions to compensate for the positive charge of the layer (Long et al., 2014). These anions are replaceable. So, these materials exhibit a specific property as an anion exchanger, which makes them highly attractive in the field of catalysis (Khan et al., 2016). In LDH class, the metal cations from transition element groups undergo redox reaction under applied potential range. Metal cations in the layer have been supposed to enhance the charge transport of the catalyst. Electron hopping mixed mechanism along the layer is believed to be a reason for charge transport, which is ascribable to the inner redox reaction between oxidized and reduced forms of metal cations (Aguilar-Vargas et al., 2013).
NiFe-LDH, (Hunter et al., 2016), CoMn-LDH (Wang J. et al., 2016), and NiCo-LDH (Yu et al., 2016) have been reported as efficient electrocatalysts for water oxidation in alkaline medium. Muller et al., presented that oxygen evolution activity of [NiFe-LDH] nanosheets is associated with Pka of the conjugate acid of interlayer anions (Hunter et al., 2016). Similarly, Sun et al., reported a three-dimensional porous film of NiFe-LDH nanoparticles as an extremely efficient and durable oxygen evolution catalyst showing low onset overpotential of 320 mV, Tafel slop of 50 mV dec−1, and water oxidation current density of 60 mA cm−2 (Yu et al., 2016).
Metal organic frameworks (MOFs) are a new class of microporous and crystalline materials (Aiyappa et al., 2019) which attained considerable attraction toward catalytic reactions due to their inherent features, including their large surface area (He et al., 2019), tunable porosity, and tailorable functionality (Corma et al., 2010; Gascon et al., 2014). For electrocatalysis, these materials are considered a promising template for the synthesis of metallic compounds and carbon-based porous materials by post calcination treatment. Active metal center and pre-functionalized organic ligands also have great electrocatalytic properties. MOFs show the characteristics of heterogenous catalysts (Wang and Wang, 2015; Wang and Wang, 2016). Undoubtedly, MOFs offer great promise as oxygen evolution reaction electrocatalysts because the accessible and tunable pores and open channels in MOFs can provide the accommodation to electrolytes, facilitate diffusion process of the reactants, and assist the transport/evolution of generated oxygen gas. Moreover, homogeneous distribution of metal cations in MOFs can serve as the catalytic active sites for OER, while ligands in frameworks would control the redox switching properties of neighboring metal cations through diversifying its coordination mode or chelating fashion (Ryu et al., 2015).
MOF-based nanomaterials have been found to be highly active for CO2 photoreduction (He X. et al., 2017). Recently, many MOF-based materials have been reported for OER, i.e., Bulk Ni.Co-MOF (Thangasamy et al., 2020), 2D Co-MOF nanosheets (Xu et al., 2018), 2D Ni-MOF@Fe-MOF nanosheets (Wan et al., 2017), Cobalt-based MOF ZIF-9 (Shen et al., 2017), ZIF-67 (Xia B. Y. et al., 2016), MOF-74 (Lu et al., 2017), ZIF-8 (Amiinu et al., 2017), 2D Cobalt MOF (Guan et al., 2017), and Ni@NC-800 (Xu et al., 2017). There is a great focus on fabricating MOFs for enhanced conduction and improved catalytic applications (Yu et al., 2016; Song et al., 2020). Zhou et al., reported Ni-based metal organic frameworks synthesized by using 4,4-biphenyldicarboxylic acid as ligand for high performance supercapacitor application where it exhibits higher specific capacitance, rate capability, operating current density, charge transfer resistance, high energy density, and ion diffusion impedance (Cao F. et al., 2017).
Herein, we have explored the synergistic effect between a cobalt-based zeolitic imidazolate framework (ZIF-12) and Fe-Cu-based LDH toward OER. Iron is an active metal that enhances the activity of a composite (Anantharaj et al., 2017). While copper in +2 oxidation state is a hard metal that is conductive in nature and its rigidity provides stability to the catalyst (Wang T. et al., 2018). Incorporation of iron species in LDH structures dramatically enhances OER activity. This behavior has been attributed to the Lewis acidity of Fe(III) (Li et al., 2017). However, the Fe(III) is more than a Lewis acid. These redox active ions in the LDH lattice cause a charge imbalance in M(OH)6 layer that is compensated for by the intercalated anions (Li Z. et al., 2015). Boettcher recommends layered structures as critically important for highly efficient water oxidation catalysis (Trotochaud et al., 2012). The main purpose of incorporation of metal-organic framework with LDH is to increase surface area and roughness factor. Here, we have chosen cobalt-based MOF because of its rich redox properties and distinctive ability to form high oxidation cobalt species during electrolysis that are critical for OER catalysis (Liang et al., 2011; Li et al., 2013; Li et al., 2016; Jin and Bard, 2020b). Due to the porous nature of MOF, the roughness factor increases. The greater the roughness factor (Rf) is, the greater the activity (Xia C. et al., 2016) will be (Rf =Cdl/60 mF cm−2). ZIF-12/FeCu-LDH composite 1) has shown a remarkable activity with a low overpotential value, low Tafel slope, and excellent stability in alkaline conditions toward electrocatalytic OER.
Synthesis of ZIF-12
The cobalt imidazolate framework (ZIF-12) was synthesized using a solvothermal process as described previously (He et al., 2013). A solution of cobalt nitrate was prepared by adding 410 mg of Co(NO3)2.6H2O to 7 ml of N,N′-dimethyl formamide (DMF). Another solution was prepared by adding 720 mg of benzimidazole (C7H6N2) to 7 ml of distilled water. Both the solutions were mixed, stirred vigorously for 5 min, and transferred into a 20 ml Teflon-lined autoclave and placed in an oven at 150°C for 48 h. After reaction completion the autoclave was cooled to room temperature and the product was collected after filtration and washed with DMF as shown in (Scheme 1).
Synthesis of ZIF-12/Fe-Cu LDH Composite (1)
Co-precipitation method was used for the synthesis of composite 1. Initially, 354 mg of ZIF-12 was suspended in a solution of Fe(NO3)2.9H2O (171 mg) and Cu(NO3)2.2H2O (362 mg) to make a stoichiometric ratio of 2:1:3. A solution containing both (OH−) and interlayer anion CO32− was added dropwise through burette. The mixture was stirred overnight, and the product precipitates were collected, washed with deionized water, and dried under vacuum as shown in (Scheme 2).
Details of instrumental characterizations are available in the supplementary information.
Fabrication of Working Electrode
For the fabrication of a working electrode, an ink of the desired catalyst was prepared by adding 5 mg of 1–2 ml of analytical grade ethanol, with 20 µl Nafion as a binder, and then sonicated for 3 h. After sonication, ink was coated on the surface of a fluorine-doped tin oxide (FTO) coated glass slide by using the drop casting method. The coated FTO electrode was dried in an oven at 70°C overnight.
Results and Discussion
The structural investigation was carried out via powder X-ray diffraction (PXRD) analysis. The PXRD patterns of FeCu-LDH, ZIF-12 and composite 1 are shown in Figure 1. The PXRD pattern of the composite have all the characteristic peaks of Fe.Cu-LDH and ZIF-12, which reveals that the incorporation of Fe.Cu-LDH in ZIF-12 does not change the framework morphology. The characteristic peaks relevant to LDH are at 2θ = 12°, 37°, and 39° and to ZIF-12 at 2θ = 4°, 6°, and 15°, which are shown in the PXRD pattern of composite 1. In x-ray diffractogram (003), (006), and (009) basal plane peaks appear, corresponding to the stacking of the lamellae, characteristic of the LDH structure (Cao A. et al., 2017; Wang et al., 2020; de Melo Costa-Serge et al., 2021) (Figure 1). Electrostatic force of interactions are expected to exist at the interface of both Fe.Cu-LDH and ZIF-12. This is due to the presence of hydroxyl ions (OH−) in LDH and cationic metal sites in ZIF-12. From the PXRD pattern, it is clear that there is no major shift in the peak positions of ZIF-12 which represent that ZIF-12 retained its structural integrity in the composite 1.
Transmission electron microscopy (TEM) was carried out to observe the morphology and particle size of the composite 1 ingredients; the images are shown in Figure 2A,B. The LDH particles mostly exist in nanosheet structures. There are also some particles of LDH where many LDH layers overlap to form a multilayer structure (Figure 2C). Figure 2D shows the high resolution TEM image where d-spacing of 0.233 nm corresponds to (015) crystal planes of LDH (Liu et al., 2019). This plane corresponds to 2θ = 39 in PXRD pattern. Lattice fringes in the TEM images confirm the presence of layer double hydroxide (LDH) in the MOF linings (Li et al., 2010; Valdez et al., 2015; Wang S. et al., 2016). The element mapping further reveals the presence of Fe, Cu, Co, and C elements distributed uniformly (Figures 2E–H).
FIGURE 2. TEM images of composite 1 (A–D). Elemental mapping with element distributions: carbon (E), copper (F), cobalt (G), and iron (H).
The X-ray photoelectron spectroscopy (XPS) studies of catalytic samples (Figure 3) confirms the existence of Fe, Cu, Co, C, and O elements. As shown in Figure 3A, two peaks at 780.7 and 795 eV are assigned to the binding energy of Co 2p3/2 and Co 2p1/2, respectively (Jiang et al., 2011; Yao et al., 2011), with two satellite peaks which are located at 786 and 803 eV and can be assigned to Co 2p3/2 satellite and Co 2p1/2 satellite, respectively (Yao et al., 2011; Zhang et al., 2016; Hada et al., 2001). The value of Co 2p3/2 is distant from the value of Co0 (i.e., 777.6 ± 0.7) but close to the value of Co2+ (i.e., 779.8 ± 0.8) which shows that cobalt is in +2 oxidation state. Figure 3B shows two peaks at 934 and 954 eV that are assigned to the binding energy of Cu 2p3/2 and Cu2p1/2 respectively with the satellite peak located at 943 eV that can be assigned to Cu 2p3/2 satellite, which indicates +2 oxidation state of copper. The chemical oxidation state of iron in Fe.Cu-LDH/ZIF-12 was investigated by XPS spectra. The peaks at 716.07 and 725.52 eV are attributed to 2p3/2 and 2p1/2 spin state of Fe(III) for LDH lamellar structure (Rajeshkhanna et al., 2018; Zhu et al., 2018) as shown in Figure 3C. At the same time, a satellite peak located at 720.76 eV also corresponds to the Fe(III) oxidation state. While Figure 3D shows the XPS result of oxygen, where a peak appears at 532.6 eV which corresponds to the metal hydroxides (Yu et al., 2013). XPS was also used to examine the composition of the catalyst, before and after catalytic activity. Supplementary Figure S3 shows the spectra observed for the C 1s, N 1s, O 1s, Fe 2p, Cu 2p, and Co. 2p regions for pristine and post-catalytic samples.
FIGURE 3. The X-ray photoelectron spectroscopy (XPS) spectra: Co 2p (A), Cu 2p (B), Fe 2p (C), and O 1s (D).
The chemical composition of as obtained composite 1 was further determined by EDX (Supplementary Figure S4 and Supplementary Table S1). Thermogravimetric analysis (TGA) curve shows that thermal decomposition occurs in two steps (Supplementary Figure S2). In the first step, 14% weight loss has been observed within the range of 100–250°C due to the removal of adsorbed water molecules and other ions. In the second step, 52% weight loss has been observed within the range of 250–350°C due to the removal of benzimidazole that follows the formation of metal oxides.
Oxygen Evolution Reaction Studies
Electrochemical OER performance of 1 was tested using a three-electrode system in KOH solution (1 mol L−1). Figure 4A shows OER performance of FeCu-LDH with a different ratio, (1:3) found to be an optimum composition ratio toward OER activity. In Fe.Cu-LDH, the active sites are iron metal (Burke et al., 2015) while copper provides conductivity; when we increase the ratio of copper, the conductivity increases to some extent, and OER activity also increases. Further increases in copper ratio decreases OER activity because copper metal replaces most of the active site in (1:5), which causes a decrease in OER performance (Burke et al., 2015). A linear sweep voltammogram of a bare FTO electrode indicated that the bare FTO has almost negligible activity toward OER, generating an insignificant amount of current (Figure 4B). Hence, it can be concluded that the current density obtained is due to oxygen evolution reaction. An LSV curve of pure iron-copper LDH and ZIF-12 coated on FTO showed that both catalysts exhibited good activity toward water oxidation and produced current densities of 46 mA cm−2 and 30 mA cm−2, respectively.
FIGURE 4. (A) LSV curves of FeCu-LDH with different ratios (B) Linear sweep voltammograms of LDH, ZIF-12, and 1, (C) Cyclic voltammogram of non-faradaic region of Composite 1 at different scan rates, and (D) plot of anodic current vs scan rates of 1 coated electrode KOH solution (1 mol L−1) as an electrolyte.
It is important to note that the activity of iron-copper layer double hydroxide was significantly enhanced by the incorporation of ZIF-12. LSV curve of composite 1 exhibited much improved OER performance by producing a current density of 96 mA cm−2. LSV results also demonstrate a significant shift in the onset potential. Composite 1 indicated water oxidation peak at an onset potential of 1.4 V vs RHE while it was observed at 1.71 and 1.69 V vs RHE for LDH and ZIF-12, respectively. These results revealed that the incorporation of ZIF-12 into FeCu-LDH has increased the efficiency of the catalyst.
The ideal overpotential for OER is 10 mA cm−2, which is a conventional value to estimation current density (j) applicable to solar fuel synthesis with 12% solar to H2 activity (Song and Hu, 2014). The composite 1 showed fast kinetics for OER by producing a current density of 10 mA cm−2 at an overpotential of 337 mV (Figure 4B). The overpotential required for 1 is comparable to NiFe-HT (more than 0.32 V) and NiFe-A (0.34 V) (Lu et al., 2014) but is much lower than those required for LDH only (470 mV), ZIF-12 (510 mV), CoP/rGO hybrids (340 mV) (Jiao et al., 2016), carbon fiber paper@FeP (350 mV) (Xiong et al., 2016), CoP hollow polyhedron (400 mV) (Liu and Li, 2016), and Ni–Co LDH nanoboxes (420 mV) (He et al., 2017b). In order to further investigate and compare the catalytic efficiency, 1 showed a mass activity of 18.86 A g−1 at an overpotential of 0.34 V which is comparable to the mass activity reported for the benchmark Ir/C (9 A g−1, 0.38 V, 0.1 M KOH) electrocatalyst (Lee Y. et al., 2012).
Furthermore, another criterion to investigate and compare the catalytic efficiency of different electrocatalysts under similar experimental conditions is the turnover frequency (TOF) calculation of the catalyst. Composite 1 exhibited a TOF of 0.01 s−1 at an overpotential of 337 mV.
The electrochemical double-layer capacitance (Cdl) of catalytic sites is another important parameter to evaluate the catalytic efficiency of the designed materials and it is associated with the electrochemical active surface area (ECSA) [4, 43–46]. Cdl value can be determined by adopting two pathways: 1) By measuring the charging currents or capacitive currents obtained from the scan rate dependent cyclic voltammograms in the non-Faradaic capacitive current region (Ibrahim et al., 2019), 2) Employing electrochemical impedance spectroscopy (EIS) for the estimation of the frequency reliant impedance of the electrocatalytic system (Zhuang et al., 2012; Brug et al., 1984; Huang et al., 2007). In this regard, a potential sweep window was selected in the non-faradic capacitive current region of the LSV scan by visual estimation of LSV data considering that all the current within that potential range is produced only due to the electrical double-layer charging. Under the chosen potential range, LS voltammograms were run at variable scan rates (5–30 mV s−1) (Figure 4C). The capacitive current was calculated by spotting a single potential value (1.15 V vs RHE) somewhere in the non-Faradaic capacitive potential window. The plot of anodic current vs. scan rates in the range from 5 to 30 mV s−1 gave a straight line with a slope equivalent to Cdl (Figure 4D) (Zou et al., 2013). The measured double layer capacitance from this analysis is 0.96 mF cm−2, which is much less than NiCoP/C nanoboxes (146 mF cm−2), Ni–Co LDH nanoboxes (9.15 mF cm−2), and NiCoP nanoboxes (28.93 mF cm−2) (He et al., 2017a). The obtained Cdl value indicated that the current density obtained in the catalytic region arises only because of the faradaic processes, as the measured charging currents values are insignificant.
In Figure 5A Tafel analysis demonstrated that 1 exhibits a slope of 89 mV dec−1 which is much lower than the Tafel slope values obtained for LDH (284 mV dec−1) or ZIF-12 (172 mV dec−1) in the current study. This value is also lower than previously reported electrocatalysts, i.e., Ni-Co LDH (113 mV dec−1) (Yu et al., 2016) and ZnCo LDH nanosheeets (101 mV dec−1) (Aiyappa et al., 2019), under the same conditions.
FIGURE 5. (A) Tafel slops of Fe.Cu-LDH, ZIF-12 and 1, (B) controlled-potential electrolysis (CPE) of 1 in basic conditions and (inset) LS voltammograms of pristine and post-catalysis of 1 modified FTO electrodes, and (C) electrochemical impedance spectra of non-faradaic region of 1 coated electrode recorded in KOH solution (1 mol L−1) as an electrolyte.
An advantageous parameter to elucidate the oxygen production performance of a catalyst is to determine the Faradaic efficiency (FE). FE is obtained by comparing the experimental and theoretical yield of evolved oxygen during a controlled-potential electrolysis (CPE) (Shah et al., 2018). In order to investigate the FE of the catalyst, a CPE experiment was performed at a constant potential of 1.45 V vs RHE for 3,000 s using similar electrochemical reaction conditions. In this regard, an oxygen probe of the dissolved oxygen (DO) meter was inserted into an air-tight anodic compartment purged with N2 gas for ten minutes, before the experiment, and the concentration of DO was monitored for an hour to establish a baseline. The charge accumulated during the electrochemical reaction was used to calculate the theoretical yield of O2 applying Faraday’s law for a four-electron process. The proximity between the amounts of DO detected during CPE and the theoretically measured oxygen evolution yield concluded FE of 77% and ruled out the possibility of a side reaction. The FE was calculated from theoretical and actual yield, which is about 77% (Supplementary Figure S1). A possible reason for composite 77% FE is probably the metals oxidation’s current contribution along with water electrolysis.
In order to assess the long-term stability and robustness of composite 1, a controlled-potential electrolysis (CPE) measurement was carried out for 10 h using chronoamperometry at 1.65 V vs RHE under constant experimental conditions as presented in Figure 5B. The CPE test indicated that the catalyst produced an excellent current density of 18.3 mA cm−2 that remained constant until the last minute of CPE. A vital test to evaluate the robustness of 1 after the catalytic activity can be performed by performing LSV measurements of both pristine and post-catalysis samples, witnessing the onset potential for OER and recording the maximum j values. It is clear in the inset of Figure 5B that the LSV of 1 coated modified electrode (before and after catalytic activities) demonstrated insignificant change in the onset potential and maximum current density values which confirmed that 1 retained its structural integrity throughout the catalytic phenomenon. Noticing the CPE results, it can be inferred that 1 has strong potential to be used as a robust and efficient OER electrocatalyst. Electrochemical impedance spectroscopy has also been done to provide more insight into electrocatalytic activity. The frequency range for EIS was between 0.1 Hz and 100 kHz for both FeCu-LDH and composite 1. A Nyquist plot of real and imaginary components of EIS in Figure 5C clearly shows that composite 1 has small arc or small charge transfer resistance as compared to FeCu-LDH, which reveals fast OER kinetics in composite 1. The most probable mechanistic pathway for OER at electrified anode is as follows:
The surface active site of composite 1 electrocatalyst was initiated by hydroxyl specie (OH-) from water and the removal of an electron to form composite 1-OH, which further reacts with another OH- to form composite 1-O- specie (Oxo-specie). This oxo-species combines with OH- to form hydro-peroxide as an intermediate composite 1-OOH. Finally, OH- species reacts with composite 1-OOH intermediate in step (III) to give O2 molecules in step (IV) of the mechanistic pathway of OER. This is in good agreement with the literature reports (Jiao et al., 2015; Suen et al., 2017; Lee et al., 2018; Sapner et al., 2020) and is summarized in Eqs. 1–4. Table 1 shows the comparative analysis of different reported benchmark electrocatalysts with composite 1.
This work represents the integration of nonprecious metal-based LDH with ZIF-12 which provides structural and compositional advantages and could have fruitful applications in the hydrogen economy. LDH/ZIF-12 composite (1) has been synthesized through the co-precipitation method. Composite 1 showed enhanced OER performance as compared to individual components, i.e., iron-copper layer double hydroxide and ZIF-12. Chronoamperometric studies including controlled-potential electrolysis show that one offers a higher current density, requires low overpotentials, and has high mass activity, faradaic efficiency, and stable catalytic response for a longer period (ca. 10 h). Hence, it can be concluded that 1, having excellent water oxidation performance, can be introduced as an efficient and stable electrocatalyst with magnificent commercial importance.
Data Availability Statement
The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding authors.
All authors listed have made a substantial, direct and intellectual contribution to the work and approved it for publication.
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
The work was financially supported by the Higher Education Commission (HEC) of Pakistan (No. 8400/Federal/NRPU/R&D/HEC/2017). The authors want to thank Prof. Yupeng Yuan and Dr Haiwei Du of Anhui University, China for their help in characterization of samples. MI expresses appreciation to the Deanship of Scientific Research at King Khalid University, Saudi Arabia through a research groups program under grant number R.G.P. 1/37/42.
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fchem.2021.686968/full#supplementary-material
Aguilar-Vargas, V., S. Valente, J., and González, I. (2013). Electrochemical Characterization of Carbon Paste Electrodes Modified with MgZnGa and ZnGaAl Hydrotalcite-like Compounds. J. Solid State. Electrochem. 17 (12), 3145–3152. doi:10.1007/s10008-013-2222-0
Aiyappa, H. B., Wilde, P., Quast, T., Masa, J., Andronescu, C., Chen, Y. T., et al. (2019). Oxygen Evolution Electrocatalysis of a Single MOF‐Derived Composite Nanoparticle on the Tip of a Nanoelectrode. Angew. Chem. Int. Ed. 58, 8927–8931. doi:10.1002/anie.201903283
Amiinu, I. S., Pu, Z., Liu, X., Owuso, K. A., Monestal, H. G. R., Boakye, F. O., et al. (2017). Multifunctional Mo–N/C@ MoS2 Electrocatalysts for HER, OER, ORR, and Zn–Air Batteries. Adv. Funct. Mater. 27 (44), 1702300. doi:10.1002/adfm.201702300
Anantharaj, S., Karthick, K., and Kundu, S. (2017). Evolution of Layered Double Hydroxides (LDH) as High Performance Water Oxidation Electrocatalysts: A Review with Insights on Structure, Activity and Mechanism. Mater. Today Energ. 6, 1–26. doi:10.1016/j.mtener.2017.07.016
Bandal, H. A., Jadhav, A. R., Chaugule, A. A., Chung, W. J., and Kim, H. (2016). Fe2O3 Hollow Nanorods/CNT Composites as an Efficient Electrocatalyst for Oxygen Evolution Reaction. Electrochimica Acta 222, 1316–1325. doi:10.1016/j.electacta.2016.11.107
Brug, G., Van Den Eeden, A., Sluyters-Rehbach, M., and Sluyters, J. (1984). The Analysis of Electrode Impedances Complicated by the Presence of a Constant Phase Element. J. Electroanal. Chem. Interfacial Electrochem. 176 (1-2), 275–295. doi:10.1016/S0022-0728(84)80324-1
Burke, M. S., Kast, M. G., Trotochaud, L., Smith, A. M., and Boettcher, S. W. (2015). Cobalt–iron (Oxy) Hydroxide Oxygen Evolution Electrocatalysts: the Role of Structure and Composition on Activity, Stability, and Mechanism. J. Am. Chem. Soc. 137 (10), 3638–3648. doi:10.1021/jacs.5b00281
Cao, A., Yang, Q., Wei, Y., Zhang, L., and Liu, Y. (2017). Synthesis of Higher Alcohols from Syngas over CuFeMg-LDHs/CFs Composites. Int. J. Hydrogen Energ. 42, 17425–17434. doi:10.1016/j.ijhydene.2017.02.170
Cao, F., Gan, M., Ma, L., Li, X., Yan, F., Ye, M., et al. (2017). Hierarchical Sheet-like Ni-Co Layered Double Hydroxide Derived from a MOF Template for High-Performance Supercapacitors. Synth. Met. 234, 154–160. doi:10.1016/j.synthmet.2017.11.001
Conti, J., Holtberg, P., Diefenderfer, J., Larose, A., Turnure, J., and Wsatefall, F. (2016). International Energy Outlook 2016 with Projections to 2040, USDOE Energy Information Administration (EIA). Washington: DC (United States). doi:10.2172/1296780
de Melo Costa-Serge, N., Gonçalves, R. G. L., Rojas-Mantilla, H. D., Santilli, C. V., Hammer, P., and Nogueira, R. F. P. (2021). Fenton-like Degradation of Sulfathiazole Using Copper-Modified MgFe-CO3 Layered Double Hydroxide. J. Hazard. Mater. 413, 125388. doi:10.1016/j.jhazmat.2021.125388
Fan, T., Yin, F., Wang, H., He, X., and Li, G. (2017). A Metal-Organic-Framework/carbon Composite with Enhanced Bifunctional Electrocatalytic Activities towards Oxygen Reduction/evolution Reactions. Int. J. Hydrogen Energ. 42, 17376–17385. doi:10.1016/j.ijhydene.2017.02.063
Gao, M. R., Xu, Y. F., Jiang, J., Zheng, Y. R., and Yu, S. H. (2012). Water Oxidation Electrocatalyzed by an Efficient Mn3O4/CoSe2 Nanocomposite. J. Am. Chem. Soc. 134 (6), 2930–2933. doi:10.1021/ja211526y
Guan, C., Liu, X., Ren, W., Li, X., Cheng, C., and Wang, J. (2017). Rational Design of Metal-Organic Framework Derived Hollow NiCo2 O4 Arrays for Flexible Supercapacitor and Electrocatalysis. Adv. Energ. Mater. 7, 1602391. doi:10.1002/aenm.201602391
Han, X. B., Zhang, Z. M., Zhang, T., Li, Y. G., Lin, W., You, W., et al. (2014). Polyoxometalate-Based Cobalt-Phosphate Molecular Catalysts for Visible Light-Driven Water Oxidation. J. Am. Chem. Soc. 136 (14), 5359–5366. doi:10.1021/ja412886e
He, K., Tadesse Tsega, T., Liu, X., Zai, J., Li, X. H., Liu, X., et al. (2019). Utilizing the Space‐Charge Region of the FeNi‐LDH/CoP P‐n Junction to Promote Performance in Oxygen Evolution Electrocatalysis. Angew. Chem. Int. Ed. 58, 11903–11909. doi:10.1002/anie.201905281
He, M., Yao, J., Liu, Q., Zhong, Z., and Wang, H. (2013). Toluene-assisted Synthesis of RHO-type Zeolitic Imidazolate Frameworks: Synthesis and Formation Mechanism of ZIF-11 and ZIF-12. Dalton Trans. 42 (47), 16608–16613. doi:10.1039/C3DT52103F
He, P., Fang, Y., Yu, X. Y., and Lou, X. W. D. (2017). Hierarchical Nanotubes Constructed by Carbon-Coated Ultrathin SnS Nanosheets for Fast Capacitive Sodium Storage. Angew. Chem. Int. Ed. 56 (40), 12202–12205. doi:10.1002/anie.201706652
He, X., Gan, Z., Fisenko, S., Wang, D., El-Kaderi, H. M., and Wang, W. N. (2017). Rapid Formation of Metal-Organic Frameworks (MOFs) Based Nanocomposites in Microdroplets and Their Applications for CO2 Photoreduction. ACS Appl. Mater. Inter. 9 (11), 9688–9698. doi:10.1021/acsami.6b16817
He, X., Yin, F., and Li, G. (2015). A Co/metal–Organic-Framework Bifunctional Electrocatalyst: the Effect of the Surface Cobalt Oxidation State on Oxygen Evolution/reduction Reactions in an Alkaline Electrolyte. Int. J. Hydrog. Energ. 40 (31), 9713–9722. doi:10.1016/j.ijhydene.2015.06.027
He, P., Yu, X. Y., and Lou, X. W. D. (2017). Carbon-Incorporated Nickel-Cobalt Mixed Metal Phosphide Nanoboxes with Enhanced Electrocatalytic Activity for Oxygen Evolution. Angew. Chem. Int. Ed. 56 (14), 3897–3900. doi:10.1002/anie.201612635
Huang, V. M. W., Vivier, V., Orazem, M. E., Pébère, N., and Tribollet, B. (2007). The Apparent Constant-Phase-Element Behavior of a Disk Electrode with Faradaic Reactions. J. Electrochem. Soc. 154 (2), C99–C107. doi:10.1149/1.2398894
Hunter, B. M., Hieringer, W., Winkler, J. R., Gray, H. B., and Müller, A. M. (2016). Effect of Interlayer Anions on [NiFe]-LDH Nanosheet Water Oxidation Activity. Energy Environ. Sci. 9 (5), 1734–1743. doi:10.1039/C6EE00377J
Ibrahim, S., Shehzadi, K., Iqbal, B., Abbas, S., Turner, D. R., and Nadeem, M. A. (2019). A Trinuclear Cobalt-Based Coordination Polymer as an Efficient Oxygen Evolution Electrocatalyst at Neutral pH. J. Colloid Interf. Sci. 545, 269–275. doi:10.1016/j.jcis.2019.03.018
Jia, G., Hu, Y., Qian, Q., Yao, Y., Zhang, S., Li, Z., et al. (2016). Formation of Hierarchical Structure Composed of (Co/Ni)Mn-LDH Nanosheets on MWCNT Backbones for Efficient Electrocatalytic Water Oxidation. ACS Appl. Mater. Inter. 8, 14527–14534. doi:10.1021/acsami.6b02733
Jiang, J., Huang, L., Liu, X., and Ai, L. (2017). Bioinspired Cobalt-Citrate Metal-Organic Framework as an Efficient Electrocatalyst for Water Oxidation. ACS Appl. Mater. Inter. 9 (8), 7193–7201. doi:10.1021/acsami.6b16534
Jiang, J., Zhu, J., Ding, R., Li, Y., Wu, F., Liu, J., et al. (2011). Co-Fe Layered Double Hydroxide Nanowall Array Grown from an alloy Substrate and its Calcined Product as a Composite Anode for Lithium-Ion Batteries. J. Mater. Chem. 21 (40), 15969–15974. doi:10.1039/C1JM12670A
Jiao, L., Zhou, Y. X., and Jiang, H. L. (2016). Metal-organic Framework-Based CoP/reduced Graphene Oxide: High-Performance Bifunctional Electrocatalyst for Overall Water Splitting. Chem. Sci. 7 (3), 1690–1695. doi:10.1039/C5SC04425A
Jiao, Y., Zheng, Y., Jaroniec, M., and Qiao, S. Z. (2015). Design of Electrocatalysts for Oxygen- and Hydrogen-Involving Energy Conversion Reactions. Chem. Soc. Rev. 44, 2060–2086. doi:10.1039/C4CS00470A
Jin, Z., and Bard, A. J. (2020). Surface Interrogation of Electrodeposited MnOx and CaMnO3 Perovskites by Scanning Electrochemical Microscopy: Probing Active Sites and Kinetics for the Oxygen Evolution Reaction. Angew. Chem. Int. 60 (2), 794–799. doi:10.1002/anie.202008052
Jin, Z. A. J., and Bard, A. J. (2020). Atom-by-atom Electrodeposition of Single Isolated Cobalt Oxide Molecules and Clusters for Studying the Oxygen Evolution Reaction. Proc. Natl. Acad. Sci. USA. 117, 12651–12656. doi:10.1073/pnas.2002168117
Khan, S. B., Khan, S. A., and Asiri, A. M. (2016). A Fascinating Combination of Co, Ni and Al Nanomaterial for Oxygen Evolution Reaction. Appl. Surf. Sci. 370, 445–451. doi:10.1016/j.apsusc.2016.02.062
Kudo, A., Kato, H., and Nakagawa, S. (2000). Water Splitting into H2and O2on New Sr2M2O7(M = Nb and Ta) Photocatalysts with Layered Perovskite Structures: Factors Affecting the Photocatalytic Activity. J. Phys. Chem. B 104 (3), 571–575. doi:10.1021/jp9919056
Lattach, Y., Rivera, J. F., Bamine, T., Deronzier, A., and Moutet, J. C. (2014). Iridium Oxide-Polymer Nanocomposite Electrode Materials for Water Oxidation. ACS Appl. Mater. Inter. 6 (15), 12852–12859. doi:10.1021/am5027852
Lee, C. H., Jun., B., and Lee, S. U. (2018). Metal-Free Oxygen Evolution and Oxygen Reduction Reaction Bifunctional Electrocatalyst in Alkaline Media: From Mechanisms to Structure-Catalytic Activity Relationship. ACS Sustainable Chem. Eng. 6, 4973–4980. doi:10.1021/acssuschemeng.7b04608
Lee, S. W., Carlton, C., Risch, M., Surendranath, Y., Chen, S., Furutsuki, S., et al. (2012). The Nature of Lithium Battery Materials under Oxygen Evolution Reaction Conditions. J. Am. Chem. Soc. 134 (41), 16959–16962. doi:10.1021/ja307814j
Lee, Y., Suntivich, J., May, K. J., Perry, E. E., and Shao-Horn, Y. (2012). Synthesis and Activities of Rutile IrO2 and RuO2 Nanoparticles for Oxygen Evolution in Acid and Alkaline Solutions. J. Phys. Chem. Lett. 3 (3), 399–404. doi:10.1021/jz2016507
Li, M., Xiong, Y., Liu, X., Bo, X., Zhang, Y., Han, C., et al. (2015). Facile Synthesis of Electrospun MFe2O4(M = Co, Ni, Cu, Mn) Spinel Nanofibers with Excellent Electrocatalytic Properties for Oxygen Evolution and Hydrogen Peroxide Reduction. Nanoscale 7 (19), 8920–8930. doi:10.1039/C4NR07243J
Li, N., Bediako, D. K., Hadt, R. G., Hayes, D., Kempa, T. J., von Cube, F., et al. (2017). Influence of Iron Doping on Tetravalent Nickel Content in Catalytic Oxygen Evolving Films. Proc. Natl. Acad. Sci. USA. 114 (7), 1486–1491. doi:10.1073/pnas.1620787114
Li, X., Niu, Z., Jiang, J., and Ai, L. (2016). Cobalt Nanoparticles Embedded in Porous N-Rich Carbon as an Efficient Bifunctional Electrocatalyst for Water Splitting. J. Mater. Chem. A. 4, 3204–3209. doi:10.1039/C6TA00223D
Li, Z., Shao, M., An, H., Wang, Z., Xu, S., Xu, M., et al. (2015). Fast Electrosynthesis of Fe-Containing Layered Double Hydroxide Arrays toward Highly Efficient Electrocatalytic Oxidation Reactions. Chem. Sci. 6, 6624–6631. doi:10.1039/C5SC02417J
Liang, H., Meng, F., Cabán-Acevedo, M., Li, L., Forticaux, A., Xiu, L., et al. (2015). Hydrothermal Continuous Flow Synthesis and Exfoliation of NiCo Layered Double Hydroxide Nanosheets for Enhanced Oxygen Evolution Catalysis. Nano Lett. 15 (2), 1421–1427. doi:10.1021/nl504872s
Liang, Y., Li, Y., Wang, H., Zhou, J., Wang, J., Regier, T., et al. (2011). Nanocrystals on Graphene as a Synergistic Catalyst for Oxygen Reduction Reaction. Nat. Mater. 10 (10), 780–786. doi:10.1038/nmat3087
Liu, L., Li, S., An, Y., Sun, X., Wu, H., Li, J., et al. (2019). Hybridization of Nanodiamond and CuFe-LDH as Heterogeneous Photoactivator for Visible-Light Driven Photo-Fenton Reaction: Photocatalytic Activity and Mechanism. Catalysts. 9 (2), 118. doi:10.3390/catal9020118
Liu, M., and Li, J. (2016). Cobalt Phosphide Hollow Polyhedron as Efficient Bifunctional Electrocatalysts for the Evolution Reaction of Hydrogen and Oxygen. ACS Appl. Mater. Inter. 8 (3), 2158–2165. doi:10.1021/acsami.5b10727
Long, X., Li, J., Xiao, S., Yan, K., Wang, Z., Chen, H., et al. (2014). A Strongly Coupled Graphene and FeNi Double Hydroxide Hybrid as an Excellent Electrocatalyst for the Oxygen Evolution Reaction. Angew. Chem. 126 (29), 7714–7718. doi:10.1002/ange.201402822
Lu, X. F., Gu, L. F., Wang, J. W., Wu, J. X., Liao, P. Q., and Li, G. R. (2017). Bimetal-organic Framework Derived CoFe2O4/C Porous Hybrid Nanorod Arrays as High-Performance Electrocatalysts for Oxygen Evolution Reaction. Adv. Mater. 29, 1604437. doi:10.1002/adma.201604437
Lu, Z., Xu, W., Zhu, W., Yang, Q., Lei, X., Liu, J., et al. (2014). Three-dimensional NiFe Layered Double Hydroxide Film for High-Efficiency Oxygen Evolution Reaction. Chem. Commun. 50 (49), 6479–6482. doi:10.1039/C4CC01625D
Ma, W., Ma, R., Wang, C., Liang, J., Liu, X., Zhou, K., et al. (2015). A Superlattice of Alternately Stacked Ni-Fe Hydroxide Nanosheets and Graphene for Efficient Splitting of Water. ACS nano 9 (2), 1977–1984. doi:10.1021/nn5069836
Man, I. C., Su, H. Y., Calle‐Vallejo, F., Hansen, H. A., Martínez, J. I., Inoglu, N. G., et al. (2011). Universality in Oxygen Evolution Electrocatalysis on Oxide Surfaces. ChemCatChem. 3 (7), 1159–1165. doi:10.1002/cctc.201000397
McCrory, C. C. L., Jung, S., Ferrer, I. M., Chatman, S. M., Peters, J. C., and Jaramillo, T. F. (2015). Benchmarking Hydrogen Evolving Reaction and Oxygen Evolving Reaction Electrocatalysts for Solar Water Splitting Devices. J. Am. Chem. Soc. 137 (13), 4347–4357. doi:10.1021/ja510442p
McCrory, C. C. L., Jung, S., Peters, J. C., and Jaramillo, T. F. (2013). Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Reaction. J. Am. Chem. Soc. 135 (45), 16977–16987. doi:10.1021/ja407115p
Rajeshkhanna, G., Singh, T. I., Kim, N. H., and Lee, J. H. (2018). Remarkable Bifunctional Oxygen and Hydrogen Evolution Electrocatalytic Activities with Trace-Level Fe Doping in Ni- and Co-layered Double Hydroxides for Overall Water-Splitting. ACS Appl. Mater. Inter. 10 (49), 42453–42468. doi:10.1021/acsami.8b16425
Ryu, J., Jung, N., Jang, J. H., Kim, H. J., and Yoo, S. J. (2015). In Situ transformation of Hydrogen-Evolving CoP Nanoparticles: toward Efficient Oxygen Evolution Catalysts Bearing Dispersed Morphologies with Co-oxo/hydroxo Molecular Units. ACS Catal. 5 (7), 4066–4074. doi:10.1021/acscatal.5b00349
Sabba, D., Kumar, M. H., Wong, L. H., Barber, J., Grätzel, M., and Mathews, N. (2015). Perovskite–hematite Tandem Cells for Efficient Overall Solar Driven Water Splitting. Nano Lett. 15 (6), 3833–3839. doi:10.1021/acs.nanolett.5b00616
Sapner, V. S., Chavan, P. P., and Sathe, B. R. (2020). l-Lysine-Functionalized Reduced Graphene Oxide as a Highly Efficient Electrocatalyst for Enhanced Oxygen Evolution Reaction. ACS Sustainable Chem. Eng. 8 (14), 5524–5533. doi:10.1021/acssuschemeng.9b06918
Shah, W. A., Waseem, A., Nadeem, M. A., and Kögerler, P. (2018). Leaching-free Encapsulation of Cobalt-Polyoxotungstates in MIL-100 (Fe) for Highly Reproducible Photocatalytic Water Oxidation. Appl. Catal. A: Gen. 567, 132–138. doi:10.1016/j.apcata.2018.08.002
Shao, Q., Yang, J., and Huang, X. (2018). The Design of Water Oxidation Electrocatalysts from Nanoscale Metal-Organic FrameworksThe Design of Water Oxidation Electrocatalysts from Nanoscale Metal–Organic Frameworks. Chem. Eur. J. 24, 15143–15155. doi:10.1002/chem.201801572
Shen, J. Q., Liao, P. Q., Zhou, D. D., He, C. T., Wu, J. X., Zhang, W. X., et al. (2017). Modular and Stepwise Synthesis of a Hybrid Metal-Organic Framework for Efficient Electrocatalytic Oxygen Evolution. J. Am. Chem. Soc. 139, 1778–1781. doi:10.1021/jacs.6b12353
Sheridan, M. V., Sherman, B. D., Fang, Z., Wee, K. R., Coggins, M. K., and Meyer, T. J. (2015). Electron Transfer Mediator Effects in the Oxidative Activation of a Ruthenium Dicarboxylate Water Oxidation Catalyst. ACS Catal. 5 (7), 4404–4409. doi:10.1021/acscatal.5b00720
Smith, R. D. L., Prévot, M. S., Fagan, R. D., Zhang, Z., Sedach, P. A., Siu, M. K. J., et al. (2013). Photochemical Route for Accessing Amorphous Metal Oxide Materials for Water Oxidation Catalysis. Science 340 (6128), 60–63. doi:10.1126/science.1233638
Song, J. L., Huang, Z. Q., Wang, B., Pan, D. S., Zhou, L. L., and Guo, Z. H. (2020). Rational Design of a N, S Co-doped Supermicroporous CoFe-Organic Framework Platform for High-Efficient Water Oxidation. ChemSusChem. 13 (10), 2564–2570. doi:10.1002/cssc.202000376
Soriano-López, J., Goberna-Ferrón, S., Vigara, L., Carbó, J. J., Poblet, J. M., and Galán-Mascarósn, J. R. (2013). Cobalt Polyoxometalates as Heterogeneous Water Oxidation Catalysts. Inorg. Chem. 52 (9), 4753–4755. doi:10.1021/ic4001945
Stracke, J. J., and Finke, R. G. (2011). Electrocatalytic Water Oxidation Beginning with the Cobalt Polyoxometalate [Co4 (H2O) 2 (PW9O34) 2] 10–: Identification of Heterogeneous CoO X as the Dominant Catalyst. J. Am. Chem. Soc. 133 (38), 14872–14875. doi:10.1021/ja205569j
Suen, N. T., Hung, S. F., Quan, Q., Zhang, N., Xu, Y. J., and Chen, H. M. (2017). Electrocatalysis for the Oxygen Evolution Reaction: Recent Development and Future Perspectives. Chem. Soc. Rev. 46 (2), 337–365. doi:10.1039/C6CS00328A
Surendranath, Y., Dincǎ, M., and Nocera, D. G. (2009). Electrolyte-dependent Electrosynthesis and Activity of Cobalt-Based Water Oxidation Catalysts. J. Am. Chem. Soc. 131 (7), 2615–2620. doi:10.1021/ja807769r
Symes, M. D., and Cronin, L. (2013). Decoupling Hydrogen and Oxygen Evolution during Electrolytic Water Splitting Using an Electron-Coupled-Proton Buffer. Nat. Chem. 5 (5), 403–409. doi:10.1038/nchem.1621
Thangasamy, P., Shanmuganathan., S., and Subramanian, V. (2020). A NiCo-MOF Nanosheet Array Based Electrocatalyst for the Oxygen Evolution Reaction. Nanoscale Adv. 2, 2073–2079. doi:10.1039/D0NA00112K
Trotochaud, L., Ranney, J. K., Williams, K. N., and Boettcher, S. W. (2012). Solution-cast Metal Oxide Thin Film Electrocatalysts for Oxygen Evolution. J. Am. Chem. Soc. 134, 17253–17261. doi:10.1021/ja307507a
Valdez, R., Grotjahn, D. B., Smith, D. K., Quintana, J. M., and Olivas, A. (2015). Nanosheets of Co-(Ni and Fe) Layered Double Hydroxides for Electrocatalytic Water Oxidation Reaction. Int. J. Electrochem. Sci. 10 (1), 909–918.
Wan, J., Chen, W., Chen, C., Peng, Q., Wang, D., and Li, Y. (2017). Facile Synthesis of CoNix Nanoparticles Embedded in Nitrogen-Carbon Frameworks for Highly Efficient Electrocatalytic Oxygen Evolution. Chem. Commun. 53, 12177–12180. doi:10.1039/C7CC07115A
Wang, H., Zhang, Z., Jing, M., Tang, S., Wu, Y., and Liu, W. (2020). Synthesis of CuNiSn LDHs as Highly Efficient Fenton Catalysts for Degradation of Phenol. Appl. Clay Sci. 186, 105433. doi:10.1016/j.clay.2019.105433
Wang, J., Cui, W., Liu, Q., Xing, Z., Asiri, A. M., and Sun, X. (2016). Recent Progress in Cobalt-Based Heterogeneous Catalysts for Electrochemical Water Splitting. Adv. Mater. 28 (2), 215–230. doi:10.1002/adma.201502696
Wang, S., Huang, Z., Li, R., Zheng, X., Lu, F., and He, T. (2016). Template-assisted Synthesis of NiP@CoAl-LDH Nanotube Arrays with superior Electrochemical Performance for Supercapacitors. Electrochimica Acta 204, 160–168. doi:10.1016/j.electacta.2016.04.051
Wang, S., and Wang, X. (2016). Imidazolium Ionic Liquids, Imidazolylidene Heterocyclic Carbenes, and Zeolitic Imidazolate Frameworks for CO2 Capture and Photochemical Reduction. Angew. Chem. Int. Ed. 55, 2308–2320. doi:10.1002/anie.201507145
Wang, T., Xu., W., and Wang, H. (2017). Ternary NiCoFe Layered Double Hydroxide Nanosheets Synthesized by Cation Exchange Reaction for Oxygen Evolution Reaction. Electrochimica Acta 257, 118–127. doi:10.1016/j.electacta.2017.10.074
Wang, T., Zhang, S., and Wang, H. (2018). Binary NiCu Layered Double Hydroxide Nanosheets for Enhanced Energy Storage Performance as Supercapacitor Electrode. Sci. China Mater. 61 (2), 296–302. doi:10.1007/s40843-017-9131-7
Wang, X. L., Dong, L. Z., Qiao, M., Tang, Y. J., Liu, J., Li, Y., et al. (2018). Exploring the Performance Improvement of the Oxygen Evolution Reaction in a Stable Bimetal-Organic Framework System. Angew. Chem. Int. Ed. 57, 9660–9664. doi:10.1039/C8TA02219D10.1002/anie.201803587
Xia, C., Jiang, Q., Zhao, C., Hedhili, M. N., and Alshareef, H. N. (2016). Selenide-Based Electrocatalysts and Scaffolds for Water Oxidation Applications. Adv. Mater. 28 (1), 77–85. doi:10.1002/adma.201503906
Xiong, D., Wang, X., Li, W., and Liu, L. (2016). Facile Synthesis of Iron Phosphide Nanorods for Efficient and Durable Electrochemical Oxygen Evolution. Chem. Commun. 52, 8711–8714. doi:10.1039/C6CC04151E
Xu, Y., Li, B., Zheng, S., Wu, P., Zhan, J., Xue, H., et al. (2018). Ultrathin Two-Dimensional Cobalt-Organic Framework Nanosheets for High-Performance Electrocatalytic Oxygen Evolution. J. Mater. Chem. A. 6, 22070–22076. doi:10.1039/C8TA03128B
Xu, Y., Tu, W., Zhang, B., Yin, S., Huang, Y., Kraft, M., et al. (2017). Nickel Nanoparticles Encapsulated in Few-Layer Nitrogen-Doped Graphene Derived from Metal-Organic Frameworks as Efficient Bifunctional Electrocatalysts for Overall Water Splitting. Adv. Mater. 29, 1605957. doi:10.1002/adma.201605957
Yamada, I., Kinoshita, M., Oda, S., Tsukasaki, H., Kawaguchi, S., Oka, K., et al. (2020). Enhanced Catalytic Activity and Stability of the Oxygen Evolution Reaction on Tetravalent Mixed Metal Oxide. Chem. Mater. 32, 3893–3903. doi:10.1021/acs.chemmater.0c00061
Yao, Z., Zhang, X., Peng, F., Yu, H., Wang, H., and Yang, J. (2011). Novel Highly Efficient Alumina-Supported Cobalt Nitride Catalyst for Preferential CO Oxidation at High Temperatures. Int. J. Hydrogen Energ. 36 (3), 1955–1959. doi:10.1016/j.ijhydene.2010.11.082
Yu, C., Liu, Z., Han, X., Huang, H., Zhao, C., Yang, J., et al. (2016). NiCo-layered Double Hydroxides Vertically Assembled on Carbon Fiber Papers as Binder-free High-Active Electrocatalysts for Water Oxidation. Carbon 110, 1–7. doi:10.1016/j.carbon.2016.08.020
Zha, Q., Yuan, F., Qin, G., and Ni, Y. (2020). Cobalt-based MOF-On-MOF Two-Dimensional Heterojunction Nanostructures for Enhanced Oxygen Evolution Reaction Electrocatalytic Activity. Inorg. Chem. 59 (2), 1295–1305. doi:10.1021/acs.inorgchem.9b03011
Zhang, Y., Ouyang, B., Xu, J., Jia, G., Chen, S., Rawat, R. S., et al. (2016). Rapid Synthesis of Cobalt Nitride Nanowires: Highly Efficient and Low-Cost Catalysts for Oxygen Evolution. Angew. Chem. Int. Ed. 55 (30), 8670–8674. doi:10.1002/anie.201604372
Zhou, T., Du, Y., Borgna, A., Hong, J., Wang, Y., Han, J., et al. (2013). Post-synthesis Modification of a Metal-Organic Framework to Construct a Bifunctional Photocatalyst for Hydrogen Production. Energ. Environ. Sci. 6 (11), 3229–3234. doi:10.1039/C3EE41548A
Zhu, W., Zhang, T., Zhang, Y., Yue, Z., Li, Y., Wang, R., et al. (2019). A Practical-Oriented NiFe-Based Water-Oxidation Catalyst Enabled by Ambient Redox and Hydrolysis Co-precipitation Strategy. Appl. Catal. B: Environ. 244, 844–852. doi:10.1016/j.apcatb.2018.12.021
Zhu, Y., Zhao, X., Li, J., Zhang, H., Chen, S., Han, W., et al. (2018). Surface Modification of Hematite Photoanode by NiFe Layered Double Hydroxide for Boosting Photoelectrocatalytic Water Oxidation. J. Alloys Compounds 764, 341–346. doi:10.1016/j.jallcom.2018.06.064
Zhuang, L., Ge, L., Yang, Y., Li, M., Jia, Y., Yao, X., et al. (2017). Ultrathin Iron‐Cobalt Oxide Nanosheets with Abundant Oxygen Vacancies for the Oxygen Evolution Reaction. Adv. Mater. 29, 1606793. doi:10.1002/adma.201606793
Zhuang, Q. C., Qiu, X. Y., Xu, S. D., Qiang, Y. H., and Sun, S. G. (2012). Diagnosis of Electrochemical Impedance Spectroscopy in Lithium-Ion Batteries. In Lithium Ion Batteries-New Developments, IntechOpen. doi:10.5772/26749
Keywords: composite, co-precipitation, electrocatalysts, water oxidation, tafel analysis
Citation: Hameed A, Batool M, Iqbal W, Abbas S, Imran M, Khan IA and Nadeem MA (2021) ZIF-12/Fe-Cu LDH Composite as a High Performance Electrocatalyst for Water Oxidation. Front. Chem. 9:686968. doi: 10.3389/fchem.2021.686968
Received: 28 March 2021; Accepted: 10 May 2021;
Published: 24 June 2021.
Edited by:Seung Woo Lee, Georgia Institute of Technology, United States
Reviewed by:Zhaoyu Jin, University of Texas at Austin, United States
Bhaskar R. Sathe, Dr. Babasaheb Ambedkar Marathwada University, India
Copyright © 2021 Hameed, Batool, Iqbal, Abbas, Imran, Khan and Nadeem. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.