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    A comparative study of metal (Ni, Co, or Mn)-borate catalysts and their photodeposition on rGO/ZnO nanoarrays for photoelectrochemical water splitting

    74386.pdf (8.170Mb)
    Access Status
    Open access
    Authors
    Zhang, H.
    Tian, W.
    Li, Y.
    Sun, Hongqi
    Tade, Moses
    Wang, Shaobin
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhang, H. and Tian, W. and Li, Y. and Sun, H. and Tade, M. and Wang, S. 2018. A comparative study of metal (Ni, Co, or Mn)-borate catalysts and their photodeposition on rGO/ZnO nanoarrays for photoelectrochemical water splitting. Journal of Materials Chemistry A. 6 (47): pp. 24149-24156.
    Source Title
    Journal of Materials Chemistry A
    DOI
    10.1039/c8ta06921b
    ISSN
    2050-7488
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150103026
    URI
    http://hdl.handle.net/20.500.11937/74101
    Collection
    • Curtin Research Publications
    Abstract

    Feasible and efficient photoelectrochemical (PEC) water splitting demands a rational integration of solar light absorbers with active electrocatalysts. Herein, we first compare three amorphous metal-borates (M-Bi, M = Ni, Co, Mn) as low-cost electrocatalysts, among which Mn-Bi is proposed for the first time for fabrication of new PEC devices for oxygen evolution reaction (OER). Density functional theory (DFT) calculations compared the catalytic activity of the effective structures in M-Bi and found that NiO6 possesses kinetically the lowest overall OER energy barrier. Experimentally, M-Bi thin layers were self-assembled on reduced graphene oxide (rGO) linked ZnO nanorod arrays respectively, to form a highly efficient ternary PEC system (M-Bi/rGO/ZnO) using a modified photodeposition method. rGO facilitates the fast charge separation in light-absorbing ZnO NAs, while M-Bi (M = Ni, Co, Mn) can improve the kinetics of OER. In accordance with DFT results, Ni-Bi serves as the most active electrocatalyst in such a PEC device, followed by Co-Bi and Mn-Bi. Compared to ZnO, the photoelectroconversion efficiency is elevated by approximately 4 times on Ni-Bi/rGO/ZnO, with its onset potential migrated by 0.17 V in the cathodic direction under one sun illumination.

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