The built-in electric field across FeN/Fe3N interface for efficient electrochemical reduction of CO2 to CO

Jie Yin (), Jing Jin, Zhouyang Yin, Liu Zhu, Xin Du (), Yong Peng, Pinxian Xi (), Chun-Hua Yan and Shouheng Sun ()
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Jie Yin: Lanzhou University
Jing Jin: Lanzhou University
Zhouyang Yin: Brown University
Liu Zhu: Electron Microscopy Centre of Lanzhou University, Lanzhou University
Xin Du: Zhengzhou University
Yong Peng: Electron Microscopy Centre of Lanzhou University, Lanzhou University
Pinxian Xi: Lanzhou University
Chun-Hua Yan: Lanzhou University
Shouheng Sun: Brown University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Nanostructured metal-nitrides have attracted tremendous interest as a new generation of catalysts for electroreduction of CO2, but these structures have limited activity and stability in the reduction condition. Herein, we report a method of fabricating FeN/Fe3N nanoparticles with FeN/Fe3N interface exposed on the NP surface for efficient electrochemical CO2 reduction reaction (CO2RR). The FeN/Fe3N interface is populated with Fe−N4 and Fe−N2 coordination sites respectively that show the desired catalysis synergy to enhance the reduction of CO2 to CO. The CO Faraday efficiency reaches 98% at −0.4 V vs. reversible hydrogen electrode, and the FE stays stable from −0.4 to −0.9 V during the 100 h electrolysis time period. This FeN/Fe3N synergy arises from electron transfer from Fe3N to FeN and the preferred CO2 adsorption and reduction to *COOH on FeN. Our study demonstrates a reliable interface control strategy to improve catalytic efficiency of the Fe–N structure for CO2RR.

Date: 2023
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DOI: 10.1038/s41467-023-37360-9

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