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

    Author(s)
    Zhang, L
    Yang, X
    Cai, R
    Chen, C
    Xia, Y
    Zhang, H
    Yang, D
    Yao, X
    Griffith University Author(s)
    Yao, Xiangdong
    Yang, Dongjiang
    Year published
    2019
    Metadata
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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. ...
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    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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    Journal Title
    Nanoscale
    Volume
    11
    Issue
    3
    DOI
    https://doi.org/10.1039/c8nr07386d
    Subject
    Physical Sciences
    Chemical Sciences
    Technology
    Publication URI
    http://hdl.handle.net/10072/386848
    Collection
    • Journal articles

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