Enhancing Local CO2 Adsorption by L-histidine Incorporation for Selective Formate Production Over the Wide Potential Window |
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Authors: | Yicheng Li Dr Ernest Pahuyo Delmo Guoyu Hou Xianglong Cui Prof Ming Zhao Prof Zhihong Tian Prof Yu Zhang Prof Minhua Shao |
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Institution: | 1. School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China;2. Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong, China;3. Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575 Singapore;4. Engineering Research Center for Nanomaterials, Henan University, Kaifeng, 475004 P. R. China |
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Abstract: | Electrochemical carbon dioxide reduction reaction (CO2RR) to produce valuable chemicals is a promising pathway to alleviate the energy crisis and global warming issues. However, simultaneously achieving high Faradaic efficiency (FE) and current densities of CO2RR in a wide potential range remains as a huge challenge for practical implements. Herein, we demonstrate that incorporating bismuth-based (BH) catalysts with L-histidine, a common amino acid molecule of proteins, is an effective strategy to overcome the inherent trade-off between the activity and selectivity. Benefiting from the significantly enhanced CO2 adsorption capability and promoted electron-rich nature by L-histidine integrity, the BH catalyst exhibits excellent FEformate in the unprecedented wide potential windows (>90 % within ?0.1–?1.8 V and >95 % within ?0.2–?1.6 V versus reversible hydrogen electrode, RHE). Excellent CO2RR performance can still be achieved under the low-concentration CO2 feeding (e.g., 20 vol.%). Besides, an extremely low onset potential of ?0.05 VRHE (close to the theoretical thermodynamic potential of ?0.02 VRHE) was detected by in situ ultraviolet-visible (UV-Vis) measurements, together with stable operation over 50 h with preserved FEformate of ≈95 % and high partial current density of 326.2 mA cm?2 at ?1.0 VRHE. |
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Keywords: | Bismuth-Based Catalyst CO2 Adsorption CO2 Reduction Electrocatalysis Formate |
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