In-Sn alloy core-shell nanoparticles: In-doped SnOx shell enables high stability and activity towards selective formate production from electrochemical reduction of CO2

作者：Wang, Jigang; Ning, Shunlian; Luo, Mi; Xiang, Dong; Chen, Wei; Kang, Xiongwu^*; Jiang, Zheng^*; Chen, Shaowei^*

来源：Applied Catalysis B: Environmental , 2021, 288: 119979.

DOI：10.1016/j.apcatb.2021.119979

• Sn-In alloy
• Tin oxide
• CO2 reduction
• Operando XANES
• Operando Raman spectroscopy

SnO2 has been recognized as excellent catalyst towards formate production from electrochemical CO2 reduction (CO2R). However, it is a great challenge to prepare SnO2 that is stable under the working condition of CO2R and the active center of the SnO2-based catalyst towards CO2R has been illusive. In this work, Sn-In alloy nanoparticles display an InSn4 intermetallic core and an amorphous In-doped tin oxide shell and a CO2-to-formate faradaic efficiency of 94% and a current density of 236 mA cm(-2) was achieved at 0.98 V. Operando X-ray absorption and Raman spectroscopy reveal that the In-doped tin oxide shell remains stable under CO2R condition. Density functional theory calculations indicate that the In-doped tin oxide results in the formation of oxygen vacancy, stabilized tin oxide shell and exergonic pathway for CO2-to-formate, which might account for the high performance of the catalysts towards CO2R.

• 单位
  中国科学院; 中国科学院研究生院