Anion Exchange Facilitates the In Situ Construction of Bi/Bi?O Interfaces for Enhanced Electrochemical CO2-to-Formate Conversion Over a Wide Potential Window |
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| Authors: | Shulin Zhao Yue Qin Xuerong Wang Chun Wang Xin Chen Yu Wang Jie-Xiang Yu Xiaojing Liu Yuping Wu Yuhui Chen |
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| Affiliation: | 1. State Key Laboratory of Materials-Oriented Chemical Engineering, and School of Energy Science and Engineering, Nanjing Tech University, Nanjing, 211816 China;2. Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 China;3. Institute of Theoretical and Applied Physics, School of Physical Science and Technology, Soochow University, Suzhou, 215006 China |
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| Abstract: | Electrochemical reduction of CO2 (CO2RR) into value-added products is a promising strategy to reduce energy consumption and solve environmental issues. Formic acid/formate is one of the high-value, easy-to-collect, and economically viable products. Herein, the reconstructed Bi2O2CO3 nanosheets (BOCR NSs) are synthesized by an in situ electrochemical anion exchange strategy from Bi2O2SO4 as a pre-catalyst. The BOCR NSs achieve a high formate Faradaic efficiency (FEformate) of 95.7% at ?1.1 V versus reversible hydrogen electrode (vs. RHE), and maintain FEformate above 90% in a wide potential range from ?0.8 to ?1.5 V in H-cell. The in situ spectroscopic studies reveal that the obtained BOCR NSs undergo the anion exchange from Bi2O2SO4 to Bi2O2CO3 and further promote the self-reduction to metallic Bi to construct Bi/Bi? O active site to facilitate the formation of OCHO* intermediate. This result demonstrates anion exchange strategy can be used to rational design high performance of the catalysts toward CO2RR. |
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| Keywords: | anion exchange Bi CO2 reduction reaction electrocatalysis formate |
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