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 

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China [2]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China [3]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China [4]Tianjin Key Laboratory of Molecular Optoelectronic Science,School of Science,Tianjin University,Tianjin 300072,China

出　　处：《Chinese Chemical Letters》2023年第7期226-229,共4页中国化学快报（英文版）

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)。

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.

关 键 词：CO_(2)reduction CuAu nanoalloy INTERMETALLIC Stability ELECTROCATALYSTS 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]