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The built-in electric field across FeN/Fe3N interface for efficient electrochemical reduction of CO2 to CO
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The built-in electric field across FeN/Fe3N interface for efficient electrochemical reduction of CO2 to CO
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The built-in electric field across FeN/Fe3N interface for efficient electrochemical reduction of CO2 to CO
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Journal Article
The built-in electric field across FeN/Fe3N interface for efficient electrochemical reduction of CO2 to CO
2023
Overview
Nanostructured metal-nitrides have attracted tremendous interest as a new generation of catalysts for electroreduction of CO
2
, but these structures have limited activity and stability in the reduction condition. Herein, we report a method of fabricating FeN/Fe
3
N nanoparticles with FeN/Fe
3
N interface exposed on the NP surface for efficient electrochemical CO
2
reduction reaction (CO
2
RR). The FeN/Fe
3
N interface is populated with Fe−N
4
and Fe−N
2
coordination sites respectively that show the desired catalysis synergy to enhance the reduction of CO
2
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/Fe
3
N synergy arises from electron transfer from Fe
3
N to FeN and the preferred CO
2
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 CO
2
RR.
Understanding and controlling chemical environment of metal-N-catalysts is of great importance. In this work, the authors reveal FeN/Fe
3
N interface with Fe-N
4
and Fe-N
2
coordination sites for enhanced electrochemical CO
2
reduction to CO.
