Preparation and electrocatalytic CO<sub>2</sub> reduction of Ni-based single-atom catalyst

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Abstract Electrocatalytic CO₂ reduction reaction (CO₂RR) has great application potential in solving global warming and the energy crisis, but the current problems such as low catalytic efficiency and diverse catalytic products limit the commercial application of CO₂RR reaction. A series of nickel single-atom catalysts with different nickel contents were prepared by a one-pot carbonization method. The morphology, structure, atomic valence state, and metal content of nickel single-atom catalysts were characterized by XRD, XPS, ICP-OES, HRTEM, HAADF-STEM, XAS and other methods. The electrocatalytic performance was evaluated by the Faradaic efficiency(FE) and current density(J) of the electrocatalytic reduction products. The electrocatalytic performance was improved by changing the electrolysis experimental device. The experimental results indicated that both FE_CO and J_CO increased as the Ni metal loading of Ni single-atom catalysts increased. Zn₁Ni₂-CN in the catalyst exhibited excellent CO₂RR catalytic performance. In the H-type electrolytic cell, the FE_CO reached 89% at -0.7 V vs. RHE, and the J_CO reached 6.99 mA·cm^-2 at -0.9 V vs. RHE. From -0.4 to -1.2 V vs. RHE in the flow electrolytic cell, FE_CO remained above 99%, and J_CO reached 174.5 mA·cm^-2 at -1.2 V vs. RHE.

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	ZHU Chao
	ZHANG Haojie
	TIAN Di
	QU Zhiguo
	DI Hongyu
	ZHENG Nan

Keywords： Ni-based single-atom catalyst electrocatalysis CO₂RR carbon monoxide

Received 2023-02-21;

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ZHU Chao, ZHANG Haojie, TIAN Di, QU Zhiguo, DI Hongyu, ZHENG Nan.Preparation and electrocatalytic CO₂ reduction of Ni-based single-atom catalyst[J] Chemcial Industry and Engineering, 2024,V41(3): 11-17

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