Unsaturated edge-anchored Ni single atoms on porous microwave exfoliated graphene oxide for electrochemical CO2
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Release time:2022-02-22 Impact Factor:19.5 DOI number:10.1016/j.apcatb.2018.10.046 Journal:Applied Catalysis B: Environmental Abstract: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 aberrationcorrected 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 mAmg−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. Indexed by:Journal paper Volume:243 Page Number:294–303 Translation or Not:no Date of Publication:2018-10-22 Links to published journals:https://doi.org/10.1016/j.apcatb.2018.10.046 -
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