Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (1): 88-94.DOI: 10.15541/jim20200142

Special Issue: 能源材料论文精选(2021) 【能源环境】CO2绿色转换

• RESEARCH LETTERS • Previous Articles     Next Articles

Bi-doped Ceria with Increased Oxygen Vacancy for Enhanced CO2 Photoreduction Performance

LIU Yaxin1,2,WANG Min1,2,SHEN Meng1,2,WANG Qiang1,2,ZHANG Lingxia1,2   

  1. 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-03-20 Revised:2020-05-07 Published:2021-01-20 Online:2020-05-20
  • About author:LIU Yaxin (1994-), male, Master. E-mail: liuyaxin@student.sic.ac.cn
  • Supported by:
    National Key Basic Research Program of China(2017YFE0127400);National Natural Science Foundation of China(21835007);National Natural Science Foundation of China(51872317);Shanghai Municipal Government S&T Project(17JC1404701)

Abstract:

Oxygen vacancy plays an important role in promoting CO2 adsorption and reduction on photocatalysts. Bi was heavily doped into ceria, forming a solid solution catalyst Ce1-xBixO2-δ meanwhile maintaining the fluorite structure, to increase the oxygen vacancy concentration. The sample Ce0.6Bi0.4O2-δ showed the highest photocatalytic activity with a CO yield of ~4.6 times that of the pristine ceria nanorods. Bi was homogeneously dispersed into the fluorite ceria which was confirmed by XRD and EDX elemental mapping. It has been evidenced by the results of Raman and XPS that Bi introduction boosts the concentration of oxygen vacancy in the solid solution that can facilitate the adsorption/activation of carbonate and bicarbonate intermediates on its surface according to in-situ FT-IR.

Key words: photocatalysis, CeO2, CO2 reduction, Bi, oxygen vacancy

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