金属间化合物
塔菲尔方程
电化学
铜
价(化学)
催化作用
X射线光电子能谱
材料科学
选择性
化学
化学工程
物理化学
电极
冶金
合金
工程类
生物化学
有机化学
作者
Siyu Kuang,Minglu Li,Xiaoyi Chen,Haoyuan Chi,Jianlong Lin,Zheng Hu,Shengsun Hu,Sheng Zhang,Xinbin Ma
标识
DOI:10.1016/j.cclet.2022.108013
摘要
Copper is one of the most efficient catalysts widely investigated in electrochemical CO2 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 CuAu intermetallic nanoalloys (o-CuAu) under mild conditions (< 250 °C), 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 CO2. 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 CO2RR electrocatalysts through proper structural engineering.
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