Regulation of Coordination Number over Single Co Sites: Triggering the Efficient Electroreduction of CO 2

Xiaoqian Wang, Zhao Chen, Xuyan Zhao, Tao Yao, Wenxing Chen, Rui You, Changming Zhao, Geng Wu, Jing Wang, Weixin Huang, Jinlong Yang, Xun Hong, Shiqiang Wei, Yuen Wu, Yadong Li
Angewandte Chemie 2018 February 12, 57 (7): 1944-1948
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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