Cobalt-doped Mn3O4 nanocrystals embedded in graphene nanosheets as a high-performance bifunctional oxygen electrocatalyst for rechargeable Zn–Air batteries

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Dong, M
Liu, X
Jiang, L
Zhu, Z
Shu, Y
Chen, S
Dou, Y
Liu, P
Yin, H
Zhao, H
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2020
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Abstract

A non-noble-metal bifunctional catalyst with efficient and durable activity towards both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is crucial to the development of rechargeable Zn-air batteries. Herein, a facile one-step hydrothermal method is reported for the synthesis of a high-performance bifunctional oxygen electrocatalyst, cobalt-doped Mn3O4 nanocrystals supported on graphene nanosheets (Co–Mn3O4/G). Compare to pristine Mn3O4, this Co–Mn3O4/G exhibits greatly enhanced electrocatalytic activity, delivering a half-wave potential of 0.866 V for the ORR and a low overpotential of 275 mV at 10 mA cm−2 for the OER. The zinc-air battery built with Co–Mn3O4/G shows a reduced charge–discharge voltage of 0.91 V at 10 mA cm−2, an power density of 115.24 mW cm−2 and excellent stability without any degradation after 945 cycles (315 h), outperforming the state-of-the-art Pt/C–Ir/C catalyst-based device.

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Green Energy and Environment

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© 2020, Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Nanotechnology

Chemical engineering

Environmental engineering

Pollution and contamination

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Dong, M; Liu, X; Jiang, L; Zhu, Z; Shu, Y; Chen, S; Dou, Y; Liu, P; Yin, H; Zhao, H, Cobalt-doped Mn3O4 nanocrystals embedded in graphene nanosheets as a high-performance bifunctional oxygen electrocatalyst for rechargeable Zn–Air batteries, Green Energy and Environment, 2020

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