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    Nitrogen-Doped Nanoporous Carbon/Graphene Nano-Sandwiches: Synthesis and Application for Efficient Oxygen Reduction

    Access Status
    Fulltext not available
    Authors
    Wei, J.
    Hu, Y.
    Liang, Y.
    Kong, B.
    Zhang, J.
    Song, J.
    Bao, Q.
    Simon, G.
    Jiang, San Ping
    Wang, H.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Wei, J. and Hu, Y. and Liang, Y. and Kong, B. and Zhang, J. and Song, J. and Bao, Q. et al. 2015. Nitrogen-Doped Nanoporous Carbon/Graphene Nano-Sandwiches: Synthesis and Application for Efficient Oxygen Reduction. Advanced Functional Materials. 25 (36): pp. 5768-5777.
    Source Title
    Advanced Functional Materials
    DOI
    10.1002/adfm.201502311
    ISSN
    1616-301X
    School
    Fuels and Energy Technology Institute
    URI
    http://hdl.handle.net/20.500.11937/39401
    Collection
    • Curtin Research Publications
    Abstract

    A zeolitic-imidazolate-framework (ZIF) nanocrystal layer-protected carbonization route is developed to prepare N-doped nanoporous carbon/graphene nano-sandwiches. The ZIF/graphene oxide/ZIF sandwich-like structure with ultrasmall ZIF nanocrystals (i.e., ≈20 nm) fully covering the graphene oxide (GO) is prepared via a homogenous nucleation followed by a uniform deposition and confined growth process. The uniform coating of ZIF nanocrystals on the GO layer can effectively inhibit the agglomeration of GO during high-temperature treatment (800 °C). After carbonization and acid etching, N-doped nanoporous carbon/graphene nanosheets are formed, with a high specific surface area (1170 m2 g−1). These N-doped nanoporous carbon/graphene nanosheets are used as the nonprecious metal electrocatalysts for oxygen reduction and exhibit a high onset potential (0.92 V vs reversible hydrogen electrode; RHE) and a large limiting current density (5.2 mA cm−2 at 0.60 V). To further increase the oxygen reduction performance, nanoporous Co-Nx/carbon nanosheets are also prepared by using cobalt nitrate and zinc nitrate as cometal sources, which reveal higher onset potential (0.96 V) than both commercial Pt/C (0.94 V) and N-doped nanoporous carbon/graphene nanosheets. Such nanoporous Co-Nx/carbon nanosheets also exhibit good performance such as high activity, stability, and methanol tolerance in acidic media.

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