文献类型：期刊文献

英文题名：In Situ Oxygen Vacancy Engineering for CO2 Electrolysis to Multi-Carbon Products with a Low CO Faradaic Efficiency of 4.5%

作者：Shen, Yongjun[1];Mao, Xiaoqing[1];Yang, Saiwu[1];Tang, Weizheng[1];Liu, Zhongliang[1];Song, Yiting[1];Li, Huihui[1];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：21

期号：18

外文期刊名：SMALL

收录：;EI(收录号：20251218088653);WOS:【SCI-EXPANDED(收录号:WOS:001445782700001)】；

基金：This work was supported by the National Natural Science Foundation of China (U22B20143, U24A20546, 22478121), Shanghai Municipal Science and Technology Major Project, the Science and Technology Commission of Shanghai Municipality (22dz1205900).

语种：英文

外文关键词：*CO intermediate; CO suppression; high electron density; oxygen vacancy

摘要：Copper (Cu) -based electrocatalysts have shown remarkable efficiency in promoting the carbon dioxide (CO2) reduction reaction (CO2RR) to multi-carbon (C2+) products. However, the challenge of minimizing the formation of the undesired byproduct carbon monoxide (CO) while enhancing the selectivity for C2+ products remains a significant hurdle. In this study, the designed and fabricated oxygen vacancy-rich Cu-based (OV-Cu/Cu2O) catalysts with the aim of suppressing CO production. The oxygen vacancies generated by the in situ cyclic voltammetry process are found to significantly enhance the electron density at the Cu site. Meanwhile, in situ Raman spectroscopy revealed that the enhanced production and adsorption of *CO resulted in reduced selectivity for CO, consequently accelerating the reduction of CO2 to C2+ products. As a result, the OV-Cu/Cu2O catalysts exhibit a low CO Faradaic efficiency (FE) of approximate to 4.5%, while achieving a high FEC2+/FECO ratio of up to 17.2 at a current density of -300 mA cm-2. These findings provide new insights into the introduction of oxygen vacancies in copper-based catalysts to suppress CO production.