无机材料学报 ›› 2021, Vol. 36 ›› Issue (1): 88-94.DOI: 10.15541/jim20200142

• 研究快报 • 上一篇    下一篇

铋掺杂提高氧化铈中氧空位浓度增强CO2光催化还原性能

刘亚鑫1,2,王敏1,2,沈梦1,2,王强1,2,张玲霞1,2   

  1. 1. 中国科学院 上海硅酸盐研究所, 高性能陶瓷和超微结构国家重点实验室, 上海 200050
    2. 中国科学院大学 材料科学与光电技术学院, 北京 100049
  • 收稿日期:2020-03-20 修回日期:2020-05-07 出版日期:2021-01-20 发布日期:2020-05-20
  • 作者简介:刘亚鑫(1994-), 男, 硕士. E-mail: liuyaxin@student.sic.ac.cn

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 Online:2021-01-20 Published: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)

摘要:

氧空位在CO2光催化还原过程中往往发挥重要作用。本工作中, 用水热法合成了不同Bi掺杂量的二氧化铈光催化剂Ce1-xBixO2-δ, 其中Ce0.6Bi0.4O2-δ在Xe灯照射下表现出最高的光催化活性, 其CO产率为纯二氧化铈纳米棒的4.6倍。X射线衍射(XRD)分析表明固溶体保留了二氧化铈的萤石结构;紫外-可见漫反射(UV-Vis)光谱表明固溶体可见光吸收增强;X射线光电子能谱 (XPS)和拉曼光谱(Raman)分析表明, 掺杂后氧空位浓度明显提高。结合原位傅里叶变换红外光谱(in-situ FT-IR), 发现引入Bi提高了固溶体中氧空位的浓度, 并改变了CO2在催化剂表面上的吸附/活化行为, 光照下碳酸氢根、碳酸根、甲酸等中间产物明显增多, 从而增强了CO2光催化还原性能。

关键词: 光催化, CeO2, CO2还原, Bi, 氧空位

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

中图分类号: