Regulation of Coordination Number over Single Co Sites: Triggering the Efficient Electroreduction of CO2 |
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| Authors: | Xiaoqian Wang Zhao Chen Xuyan Zhao Prof. Tao Yao Prof. Wenxing Chen Prof. Rui You Changming Zhao Geng Wu Jing Wang Prof. Weixin Huang Prof. Jinlong Yang Prof. Xun Hong Prof. Shiqiang Wei Prof. Yuen Wu Prof. Yadong Li |
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| Affiliation: | 1. Department of Chemistry,iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China, Hefei, Anhui, P. R. China;2. Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, P. R. China;3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, P. R. China;4. Department of Chemistry, Tsinghua University, Beijing, P. R. China |
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| Abstract: | The design of active, selective, and stable CO2 reduction electrocatalysts is still challenging. A series of atomically dispersed Co catalysts with different nitrogen coordination numbers were prepared and their CO2 electroreduction catalytic performance was explored. The best catalyst, atomically dispersed Co with two‐coordinate nitrogen atoms, achieves both high selectivity and superior activity with 94 % CO formation Faradaic efficiency and a current density of 18.1 mA cm?2 at an overpotential of 520 mV. The CO formation turnover frequency reaches a record value of 18 200 h?1, surpassing most reported metal‐based catalysts under comparable conditions. Our experimental and theoretical results demonstrate that lower a coordination number facilitates activation of CO2 to the CO2.? intermediate and hence enhances CO2 electroreduction activity. |
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| Keywords: | CO2 reduction electrocatalysis metal single sites metal– organic frameworks renewable energy |
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