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    Unsaturated edge-anchored Ni single atoms on porous microwave exfoliated graphene oxide for electrochemical CO2

    Access Status
    Fulltext not available
    Authors
    Cheng, Y.
    Zhao, S.
    Li, H.
    He, S.
    Veder, Jean-Pierre
    Johannessen, B.
    Xiao, J.
    Lu, S.
    Pan, J.
    Chisholm, M.
    Yang, S.
    Liu, C.
    Chen, J.
    Jiang, San Ping
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Cheng, Y. and Zhao, S. and Li, H. and He, S. and Veder, J. and Johannessen, B. and Xiao, J. et al. 2019. Unsaturated edge-anchored Ni single atoms on porous microwave exfoliated graphene oxide for electrochemical CO2. Applied Catalysis B: Environmental. 243: pp. 294-303.
    Source Title
    Applied Catalysis B: Environmental
    DOI
    10.1016/j.apcatb.2018.10.046
    ISSN
    0926-3373
    School
    John de Laeter Centre
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150102044
    http://purl.org/au-research/grants/arc/DP180100568
    http://purl.org/au-research/grants/arc/DP180100731
    URI
    http://hdl.handle.net/20.500.11937/73310
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier B.V. Supported single atom catalysts (SACs), emerging as a new class of catalytic materials, have been attracting increasing interests. Here we developed a Ni SAC on microwave exfoliated graphene oxide (Ni-N-MEGO) to achieve single atom loading of ~6.9 wt%, significantly higher than previously reported SACs. The atomically dispersed Ni atoms, stabilized by coordination with nitrogen, were found to be predominantly anchored along the edges of nanopores (< 6 nm) using a combination of X-ray absorption spectroscopy (XAS) and aberration-corrected scanning transmission electron microscopy (AC-STEM). The Ni-N-MEGO exhibits an onset overpotential of 0.18 V, and a current density of 53.6 mA mg-1 at overpotential of 0.59 V for CO2 reduction reaction (CO2RR), representing one of the best non-precious metal SACs reported so far in the literature. Density functional theory (DFT) calculations suggest that the electrochemical CO2-to-CO conversion occurs more readily on the edge-anchored unsaturated nitrogen coordinated Ni single atoms that lead to enhanced activity toward CO2RR.

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