AUTHOR=Bhat Vinay S. , Jayeoye Titilope John , Rujiralai Thitima , Sirimahachai Uraiwan , Chong Kwok Feng , Hegde Gurumurthy 

TITLE=Acacia auriculiformis–Derived Bimodal Porous Nanocarbons via Self-Activation for High-Performance Supercapacitors

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 9 - 2021

YEAR=2021

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2021.744133

DOI=10.3389/fenrg.2021.744133

ISSN=2296-598X

ABSTRACT=The role of temperature in biomass pyrolysis via a possible ‘self-activation’ mechanism was detailed. The carbon synthesized at 800 °C (AAC800) were found to exhibit well organized hierarchical porous structure, which was seen from field-emission scanning electron microscopy (FESEM) and quantified further from N2 adsorption/desorption isotherms. Micropores were found to be contributing towards enhancing specific surface area. AAC800 exhibited maximum specific capacitance of 176.7 F/g at 0.5 A/g in 6.0 M KOH electrolyte in a three-electrode setup. CR2032 type symmetric supercapacitor was fabricated by AAC800 as active material in an organic electrolyte composed of 1.0 M tetraethylammonium tetrafluoroborate (TEABF4) as conducting salt in acetonitrile (ACN) solvent. Self-discharge of the cell was analysed from fitting two different mathematical models. The cell exhibited remarkable Coulombic efficiency of 100% over 10000 charge/discharge cycles retaining ~93% capacitance at 2.3 V.