化学
过电位
乙醇
氧气
法拉第效率
析氧
纳米笼
氧化还原
无机化学
催化作用
可逆氢电极
电化学
有机化学
电极
物理化学
工作电极
作者
Fengfei Xu,Bo Feng,Zhen Shen,Yiqun Chen,Jiao Liu,Ye Zhang,Jingyi Tian,Junru Zhang,Xizhang Wang,Lijun Yang,Qiang Wu,Zheng Hu
摘要
Electrocatalytic CO2 reduction (CO2RR) to alcohols offers a promising strategy for converting waste CO2 into valuable fuels/chemicals but usually requires large overpotentials. Herein, we report a catalyst comprising unique oxygen-bridged Cu binuclear sites (CuOCu-N4) with a Cu···Cu distance of 3.0–3.1 Å and concomitant conventional Cu–N4 mononuclear sites on hierarchical nitrogen-doped carbon nanocages (hNCNCs). The catalyst exhibits a state-of-the-art low overpotential of 0.19 V (versus reversible hydrogen electrode) for ethanol and an outstanding ethanol Faradaic efficiency of 56.3% at an ultralow potential of −0.30 V, with high-stable Cu active-site structures during the CO2RR as confirmed by operando X-ray adsorption fine structure characterization. Theoretical simulations reveal that CuOCu-N4 binuclear sites greatly enhance the C–C coupling at low potentials, while Cu-N4 mononuclear sites and the hNCNC support increase the local CO concentration and ethanol production on CuOCu-N4. This study provides a convenient approach to advanced Cu binuclear site catalysts for CO2RR to ethanol with a deep understanding of the mechanism.
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