Citation: Siyu Kuang, Minglu Li, Xiaoyi Chen, Haoyuan Chi, Jianlong Lin, Zheng Hu, Shi Hu, Sheng Zhang, Xinbin Ma. Intermetallic CuAu nanoalloy for stable electrochemical CO₂ reduction[J]. Chinese Chemical Letters, ;2023, 34(7): 108013. doi: 10.1016/j.cclet.2022.108013 shu

Intermetallic CuAu nanoalloy for stable electrochemical CO₂ reduction

Siyu Kuang ^{a, 1} ,
Minglu Li ^{a, 1} ,
Xiaoyi Chen ^a ,
Haoyuan Chi ^a ,
Jianlong Lin ^a ,
Zheng Hu ^d ,
Shi Hu ^d ,
Sheng Zhang ^{a, b, c, *,} ,
Xinbin Ma ^{a, b, c}

a.
Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
b.
Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
c.
Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou 350207, China
d.
Tianjin Key Laboratory of Molecular Optoelectronic Science, School of Science, Tianjin University, Tianjin 300072, China

sheng.zhang@tju.edu.cn

Received Date: 8 August 2022
Revised Date: 4 November 2022
Accepted Date: 20 November 2022
Available Online: 23 November 2022

Figures(4)

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 ℃), 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.
- CO₂ reduction,
- CuAu nanoalloy,
- Intermetallic,
- Stability,
- Electrocatalysts
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Intermetallic CuAu nanoalloy for stable electrochemical CO2 reduction

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通讯作者: 陈斌, bchen63@163.com

Intermetallic CuAu nanoalloy for stable electrochemical CO₂ reduction