Nanoconfinement Effects of Yolk-Shell Cu2O Catalyst for Improved C2+ Selectivity and Cu+ Stability in Electrocatalytic CO2 Reduction

被引：20
作者：
Lu, Jinghao [1 ]
Yang, Lili [1 ]
Zhang, Yishuai [1 ]
Wang, Chao [1 ]
Zhang, Chuanhui [1 ]
Zhao, Xiu Song [1 ]
机构：
[1] Qingdao Univ, Inst Mat Energy & Environm, Coll Mat Sci & Engn, Qingdao 266071, Peoples R China
来源：
ACS APPLIED NANO MATERIALS | 2023年 / 6卷 / 22期
基金：
中国国家自然科学基金;
关键词：
Cu2O; yolk-shellstructure; CO2; reduction; nanoconfinement; selectivity; in situ ATR-SEIRAS; ELECTROCHEMICAL REDUCTION; OXIDATION-STATE; COPPER; ELECTROREDUCTION; ELECTRODES; OPERANDO; SURFACE;
D O I：
10.1021/acsanm.3c03645
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Electrocatalytic conversion of carbon dioxide (CO2) to value-added hydrocarbon products provides an industrially viable approach to utilizing carbon resources and the storage of renewable energy. Monovalent copper (Cu+) has been demonstrated to be indispensable for the formation of C2+ products via C-C coupling. However, the C2+ selectivity and stability of Cu+ at the cathodic potential remain a great challenge. In this work, we investigated the electrochemical properties of three Cu-based catalysts with different structures in the electrocatalytic reduction of the CO2 reaction (eCO(2)RR). Results showed that a Cu2O catalyst with a yolk-shell microstructure having a distance between the shell internal surface and the core external surface of 25 nm displays the best performance. It exhibits a C2+ Faradaic efficiency of 80.2% and a FEC2+ to FEC1 ratio of similar to 8.9. Both in situ ATR-SEIRAS and ex situ XPS characterization results reveal that Cu+ is stable under the experimental conditions, and the coverage of adsorbed carbon monoxide (*CO) on the Cu+ active site is enhanced due to nanoconfinement effects. The increased *CO surface coverage significantly promotes C-C coupling, leading to enhanced C2+ selectivity.
引用
收藏
页码：20746 / 20756
页数：11
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