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  • Nitrogen-Stabilized Low-Valent Ni Motifs for Efficient CO2 Electrocatalysis

    Author(s)
    Wen, Chun Fang
    Mao, Fangxin
    Liu, Yuanwei
    Zhang, Xin Yu
    Fu, Huai Qin
    Zheng, Li Rong
    Liu, Peng Fei
    Yang, Hua Gui
    Griffith University Author(s)
    Yang, Huagui
    Fu, Huai Qin
    Year published
    2020
    Metadata
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    Abstract
    Single-atom catalysts have found considerable applications in the field of electrochemical CO2 reduction reaction (CO2RR) due to their unique coordination environments. However, during the preparation of single-atom catalysts, some metal nanoparticles (NPs) are inevitably generated, which suffer from low selectivity in CO2RR. In this regard, complex postprocessing solution treatments are usually conducted to remove metal NPs using acid. Herein, we fabricated Ni(NC)-based catalysts composed of single Ni atoms and Ni NPs, both of which feature local Ni-N coordination via a simple Ni-metal organic framework (MOF)-assisted ...
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    Single-atom catalysts have found considerable applications in the field of electrochemical CO2 reduction reaction (CO2RR) due to their unique coordination environments. However, during the preparation of single-atom catalysts, some metal nanoparticles (NPs) are inevitably generated, which suffer from low selectivity in CO2RR. In this regard, complex postprocessing solution treatments are usually conducted to remove metal NPs using acid. Herein, we fabricated Ni(NC)-based catalysts composed of single Ni atoms and Ni NPs, both of which feature local Ni-N coordination via a simple Ni-metal organic framework (MOF)-assisted strategy. Based on X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) spectroscopy measurements, nitrogen species in N-doped carbon have been demonstrated to be coordinated with surface nickel species to form Ni-N motifs, which makes Ni at a low-valent state for efficient CO2RR. Consequently, the catalyst exhibited high performances toward CO2RR with CO Faradic efficiencies (FECO) maintained over 90% from -0.65 to -0.90 V vs reversible hydrogen electrode (RHE). More importantly, the FECO of 99% could be obtained at a considerable current density (j) of -160 mA cm-2 in a flow cell configuration. These findings suggest that regulating the surface environment of Ni species can activate the original inert reaction sites into active reaction sites, providing a promising avenue to design high-performance electrocatalysts for CO2RR.
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    Journal Title
    ACS Catalysis
    Volume
    10
    Issue
    2
    DOI
    https://doi.org/10.1021/acscatal.9b02978
    Subject
    Inorganic chemistry
    Organic chemistry
    Chemical engineering
    Science & Technology
    Physical Sciences
    Chemistry, Physical
    Chemistry
    CO2 reduction reaction
    Publication URI
    http://hdl.handle.net/10072/408995
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    • Journal articles

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