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Electrochemical CO2 reduction reaction (CO2RR) is a promising technology for mitigating global warming and storing renewable energy. Designing low-cost and efficient electrocatalysts with high selectivity is a priority to facilitate CO2 conversion. Halide ion (F, Cl, Br, I) modified electrocatalysts is a potential strategy to promote CO2 reduction and suppress the competitive hydrogen evolution reaction (HER). Therefore, a comprehensive review of the role and mechanism of halide ions in the CO2RR process can help better guide the future design of efficient electrocatalysts. In this review, we first discuss the role of halide ions on the structure and morphology of electrocatalysts. Secondly, the relationship between the halide ions and the valence states of the active sites on the catalyst surface is further elaborated on. Thirdly, the mechanisms of halide in enhancing CO2 conversion efficiency are also summarized, including the involvement of halide ions in electron transfer and their influence on the reaction pathway. Finally, we conclude with a summary and future outlook.


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Reviewing the impact of halides on electrochemical CO2 reduction

Show Author's information Zebi Zhao1Jiguang Zhang2Ming Lei1( )Yanwei Lum2( )
State Key Laboratory of Information Photonics and Optical Communications & School of Integrated Circuits, Beijing University of Posts and Telecommunications, Beijing 100876, China
Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis way, Innovis, Singapore 138634, Singapore

Abstract

Electrochemical CO2 reduction reaction (CO2RR) is a promising technology for mitigating global warming and storing renewable energy. Designing low-cost and efficient electrocatalysts with high selectivity is a priority to facilitate CO2 conversion. Halide ion (F, Cl, Br, I) modified electrocatalysts is a potential strategy to promote CO2 reduction and suppress the competitive hydrogen evolution reaction (HER). Therefore, a comprehensive review of the role and mechanism of halide ions in the CO2RR process can help better guide the future design of efficient electrocatalysts. In this review, we first discuss the role of halide ions on the structure and morphology of electrocatalysts. Secondly, the relationship between the halide ions and the valence states of the active sites on the catalyst surface is further elaborated on. Thirdly, the mechanisms of halide in enhancing CO2 conversion efficiency are also summarized, including the involvement of halide ions in electron transfer and their influence on the reaction pathway. Finally, we conclude with a summary and future outlook.

Keywords: electrocatalysts, CO2 reduction reaction, energy conversion, halide ions, catalytic mechanism

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Publication history
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Publication history

Received: 10 October 2022
Revised: 31 October 2022
Accepted: 05 November 2022
Published: 30 November 2022
Issue date: March 2023

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© The Author(s) 2023. Published by Tsinghua University Press.

Acknowledgements

Acknowledgements

This study was supported financially by the Fundamental Research Funds for the Central Universities (2021XD-A04-2) and the Fund of State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications, P.R. China). Additionally, Zebi Zhao acknowledges the financial assistance from China Scholarship Council (CSC, No. 202206470057). Y. L. acknowledges support and funding from A*STAR Career Development Award (Project No. 202D800037).

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