In-Situ Constructuring of Copper-Doped Bismuth Catalyst for Highly Efficient CO2 Electrolysis to Formate in Ampere-Level |
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Authors: | Haidong Shen Yike Zhao Ling Zhang Yuan He Shaowei Yang Tianshuai Wang Yueling Cao Ying Guo Qiuyu Zhang Hepeng Zhang |
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Institution: | Xi'an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, 710129 P. R. China |
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Abstract: | CO2 electrochemical reduction (CO2RR) can mitigate environmental issues while providing valuable products, yet challenging in activity, selectivity, and stability. Here, a CuS-Bi2S3 heterojunction precursor is reported that can in situ reconstruct to Cu-doped Bismuth (CDB) electrocatalyst during CO2RR. The CDB exhibits an industrial-compatible current density of ?1.1 A cm?2 and a record-high formate formation rate of 21.0 mmol h?1 cm?2 at ?0.86 V versus the reversible hydrogen electrode toward CO2RR to formate, dramatically outperforming currently reported catalysts. Importantly, the ultrawide potential region of 1050 mV with high formate Faradaic efficiency of over 90% and superior long-term stability for more than 100 h at ?400 mA cm?2 can also be realized. Experimental and theoretical studies reveal that the remarkable CO2RR performance of CDB results from the doping effect of Cu which optimizes adsorption of the *OCHO and boosts the structural stability of metallic bismuth catalyst. This study provides valuable inspiration for the design of element-doping electrocatalysts to enhance catalytic activity and durability. |
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Keywords: | activity carbon dioxide reduction Cu-doped bismuth nanosheets durability electrocatalysis in situ restructuring |
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