Intermetallic CuAu nanoalloy for stable electrochemical CO_(2) reduction

作     者：Siyu Kuang Minglu Li Xiaoyi Chen Haoyuan Chi Jianlong Lin Zheng Hu Shi Hu Sheng Zhang Xinbin Ma Siyu Kuang;Minglu Li;Xiaoyi Chen;Haoyuan Chi;Jianlong Lin;Zheng Hu;Shi Hu;Sheng Zhang;Xinbin Ma

作者机构：Key Laboratory for Green Chemical Technology of Ministry of EducationSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical TransformationsTianjin 300192China Joint School of National University of Singapore and Tianjin UniversityInternational Campus of Tianjin UniversityFuzhou 350207China Tianjin Key Laboratory of Molecular Optoelectronic ScienceSchool of ScienceTianjin UniversityTianjin 300072China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2023年第34卷第7期

页      面：226-229页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：financial support from National Nature Science Foundation of China (Nos. 22078232 and 21938008) the Science and Technology Major Project of Tianjin (Nos. 19ZXNCGX00030 and 20JCYBJC00870) 

主　　题：CO_(2)reduction CuAu nanoalloy Intermetallic Stability Electrocatalysts 

摘      要：Copper is one of the most efficient catalysts widely investigated in electrochemical CO_(2) reduction, however, the further development of copper-based catalysts is constrained by severe stability problems. In this work, we developed a method for the synthesis of highly ordered Cu Au intermetallic nanoalloys(o-CuAu) under mild conditions( 250℃), which can convert carbon dioxide to carbon monoxide with high selectivity and can operate stably for 160 h without current decay. The improved stability is believed to be due to the increased mixing enthalpy and stronger atomic interactions between Cu and Au atoms in the intermetallic nanoalloy. In addition, XPS results, Tafel slope and in situ IR spectroscopy demonstrate that high valence gold atoms on o-CuAu surface promote the reduction of CO_(2). In contrast, the disordered CuAu nanoalloy(d-CuAu) underwent atomic rearrangement to form a Cu-rich structure on the surface, leading to reduced stability. These findings may provide insight into the rational design of stable CO_(2) RR electrocatalysts through proper structural engineering.