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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Chem. | doi: 10.3389/fchem.2019.00524

The Synergistic Effect Accelerates the Oxygen Reduction / Evolution Reaction in a Zn-air Battery

 Yidan Zhang1,  Youmin Guo1*, Tao Liu1, Fuxu Feng1, Chunchang Wang1, Haibo Hu1,  Mingzai Wu1,  Meng NI2 and Zongping Shao3, 4
  • 1Anhui University, China
  • 2Hong Kong Polytechnic University, Hong Kong
  • 3Curtin University, Australia
  • 4Nanjing Tech University, China

Perovskite oxides are promising electrocatalysts towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) due to their abundance and high intrinsic catalytic activity. Here we introduce Ag into Sm0.5Sr0.5CoO3-δ (SSC) to form a Ag-SSC catalyst by ultrasonication and apply it as the air electrode for a Zn-air battery. It finds that the introduction of Ag into SSC can transform the Ag-SSC into a good bifunctional electrocatalyst towards ORR as well as OER. For instance, a more active half-wave potential with a value of 0.76 V for ORR is obtained at 1600 rpm, while the OER overpotential is 0.43V at I=10 mA cm-2. Further characterization demonstrates that the improved catalyst activity of the Ag-SSC can be assigned to the synergistic effect generated between the Ag and SSC phases. The Zn-air battery with the Ag-SSC as an electrode not only gives a same discharge-charge voltage gap (1.33 V) with that of commercial Pt/C (1.33 V) but also presents an equivalent current efficiency (45.7% for Ag-SSC and 45.3% for Pt/C) at 10 mA cm-2. Moreover, the stability for 110 cycles is better. This result indicates that the Ag-SSC catalyst shows promise for use as a bifunctional electrocatalyst towards OER and ORR.

Keywords: Sr-doped Sm Cobaltite Perovskite, Oxygen Reduction Reaction, Oxygen Evolution reaction, Silver glue, synergistic effect

Received: 16 May 2019; Accepted: 09 Jul 2019.

Edited by:

Yubo Chen, Nanyang Technological University, Singapore

Reviewed by:

Guntae Kim, Ulsan National Institute of Science and Technology, South Korea
Yunfei Bu, Nanjing University of Information Science and Technology, China  

Copyright: © 2019 Zhang, Guo, Liu, Feng, Wang, Hu, Wu, NI and Shao. 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.

* Correspondence: Mx. Youmin Guo, Anhui University, Hefei, 230601, Anhui Province, China, youminguo@ahu.edu.cn