期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 26, 页码 9641-9649出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c00302
关键词
Ba modification; LaTiO2N; photocatalysis; Ti3+ defect; water oxidation; perovskite; oxynitrides
资金
- National Natural Science Foundation of China [51972233]
- Natural Science Foundation of Shanghai [19ZR1459200]
- Shanghai Science and Technology Commission [14DZ2261100]
- Fundamental Research Funds for the Central Universities
LaTiO2N has been considered as one of the most promising photocatalysts for solar energy conversion. Nevertheless, it generally has a poor photocatalytic activity under normal conditions, probably linked to severe structural distortions and various types of defects within this compound. Herein, we modified LaTiO2N by introducing Ba into its A sit; that is, La0.8Ba0.2Ti0 2.2N0.8. The presence of Ba at the A site of LaTiO2N not only relaxes the structural distortions but also effectively inhibits defect formation (e.g. Ti3+ species) in LaTiO2N. Moreover, surface hydrophilicity of LaTiO2N is also improved by Ba modification. Photoelectrochemical analysis suggests that charge separation and transferring situation are ameliorated in Ba-modified LaTiO2N, and the valence band edge position is positively shifted. These factors are likely the reasons for the improved photocatalytic activity of La(0.8)Ba(0.2)Ti(0 2.2)N(0.8 )in water oxidation reactions.
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