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Title: The synergistic effect accelerates the oxygen reduction/evolution reaction in a Zn-air battery
Authors: Zhang, YD
Guo, YM
Liu, T
Feng, FX
Wang, CC
Hu, HB
Wu, MZ
Ni, M 
Shao, ZP
Keywords: Sr-doped Sm cobaltite perovskite
Oxygen reduction reaction
Oxygen evolution reaction
Silver glue
Synergistic effect
Issue Date: 2019
Publisher: Frontiers Media SA
Source: Frontiers in chemistry, 23 July 2019, v. 7, 524, p. 1-10 How to cite?
Journal: Frontiers in chemistry 
Abstract: Perovskite oxides are promising electrocatalysts toward 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-delta (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 toward 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 1,600 rpm, while the OER overpotential is 0.43 V 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 toward OER and ORR.
EISSN: 2296-2646
DOI: 10.3389/fchem.2019.00524
Rights: 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.
The following publication Zhang Y, Guo Y, Liu T, Feng F, Wang C, Hu H, Wu M, Ni M and Shao Z (2019) The Synergistic Effect Accelerates the Oxygen Reduction/Evolution Reaction in a Zn-Air Battery. Front. Chem. 7:524. doi: 10.3389/fchem.2019.00524 is available at
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