Bi selectively doped SrTiO3-x nanosheets enhance photocatalytic CO2 reduction under visible light

被引：53

作者：

Pan L. ^{[1
]}

Mei H. ^{[1
]}

Zhu G. ^{[2
]}

Li S. ^{[3
]}

Xie X. ^{[2
]}

Gong S. ^{[2
]}

Liu H. ^{[1
]}

Jin Z. ^{[1
]}

Gao J. ^{[2
]}

Cheng L. ^{[1
]}

Zhang L. ^{[1
]}

机构：

[1] Science and Technology on Thermostructural Composite Materials Laboratory, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’ an, 710072, Shaanxi

[2] School of Physics and Information Technology, Shaanxi Normal University, Xi’ an

[3] Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, Yongin

来源：

Journal of Colloid and Interface Science | 2022年 / 611卷

基金：

中国国家自然科学基金;

关键词：

Active site; Bi doping; Intermediates; Oxygen vacancy; SrTiO[!sub]3-x[!/sub] nanosheet;

D O I：

10.1016/j.jcis.2021.12.033

中图分类号：

学科分类号：

摘要：

Converting CO2 into chemical energy by using solar energy is an environmental strategy to achieve carbon neutrality. In this paper, two dimensionality (2D) SrTiO3-x nanosheets with oxygen vacancies were synthesized successfully. Oxygen vacancies will generate defect levels in the band structure of SrTiO3-x. So, SrTiO3-x nanosheets have good photocatalytic CO2 reduction performance under visible light. In order to further improve its photocatalytic efficiency, Bi was used to dope Sr site and Ti site in SrTiO3-x nanosheets respectively. It is found that Sr site is the adsorption site of CO2 molecules. When Bi replaced Sr, CO2 adsorption on the surface of SrTiO3-x nanosheets was weakened. When Bi replaced Ti, there has no effect on CO2 adsorption. Due to the synergistic effect of Bi doping, oxygen vacancies, and Sr active site, the 1.0% Bi-doped Ti site in SrTiO3-x (1.0% Bi-Ti-STO) had the best photocatalytic performance under visible light (λ ≥ 420 nm). CO and CH4 yields were 5.58 umol/g/h and 0.36 umol/g/h. Photocatalytic CO2 reduction path has always been the focus of exploration. The in-situ FTIR spectrum proved the step of photocatalytic CO2 reduction and COO– and COOH are important intermediates in the photocatalytic CO2 reaction. © 2021 Elsevier Inc.

引用

页码：137 / 148

页数：11

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