Air cathode of zinc-air batteries: A highly efficient and durable aerogel catalyst for oxygen reduction

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Zhang, L
Yang, X
Cai, R
Chen, C
Xia, Y
Zhang, H
Yang, D
Yao, X
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2019
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Abstract

In this communication, N-doped carbon shell encapsulated Co3O4@Co nanoparticles (NPs) were assembled on N-doped reduced graphene oxide to form non-precious metal aerogels (Co3O4@Co/N-r-GO) for oxygen reduction. In an alkaline medium, the aerogels exhibit comparable oxygen reduction reaction (ORR) performances to the commercial Pt/C with respect to half-wave potential, current density and durability. Zn–air batteries (ZABs) assembled with Co3O4@Co/N-r-GO as the air cathode display high average voltages of ∼1.38 and ∼1.3 V at a current density of 1 and 5 mA cm−2, respectively, and show a specific capacity of ∼800 mA h g−1. These results demonstrate that Co3O4@Co/N-r-GO materials are highly active and durable ORR catalysts for ZABs. The unique structure of the composite aerogel, i.e. the carbon shell encapsulated Co3O4@Co NPs and the 3D interconnected macroporous N-r-GO matrix, is responsible for its high ORR activity and stability.

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Nanoscale

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11

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3

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Physical sciences

Chemical sciences

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Zhang, L; Yang, X; Cai, R; Chen, C; Xia, Y; Zhang, H; Yang, D; Yao, X, Air cathode of zinc-air batteries: A highly efficient and durable aerogel catalyst for oxygen reduction, Nanoscale, 2019, 11 (3), pp. 826-832

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