Adjusting the ratio of bulk single-electron-trapped oxygen vacancies/surface oxygen vacancies in TiO2 for efficient photocatalytic hydrogen evolution

被引：81
作者：
Hou, Lili [1 ]
Guan, Zhongjie [1 ]
Zhang, Min [1 ]
He, Chunqing [2 ]
Li, Qiuye [1 ]
Yang, Jianjun [1 ]
机构：
[1] Henan Univ, Collaborat Innovat Ctr Nano Funct Mat & Applicat, Natl & Local Joint Engn Res Ctr Appl Technol Hybr, Kaifeng 475004, Peoples R China
[2] Wuhan Univ, Sch Phys & Technol, Key Lab Nucl Solid State Phys Hubei Prov, Wuhan 430072, Hubei, Peoples R China
来源：
CATALYSIS SCIENCE & TECHNOLOGY | 2018年 / 8卷 / 11期
基金：
中国国家自然科学基金;
关键词：
CHARGE SEPARATION; TITANIUM-DIOXIDE; FACILE SYNTHESIS; BLACK TIO2; SURFACE; DRIVEN; DEFECTS; NANOPARTICLES; ENHANCEMENT; REDUCTION;
D O I：
10.1039/c8cy00644j
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of the concentration ratio of bulk single-electron-trapped oxygen vacancies/surface oxygen vacancies on the photocatalytic hydrogen production of TiO2 was investigated. A series of TiO2 materials with a tunable concentration ratio of bulk and surface oxygen vacancies were prepared through a NaBH4 solidstate reduction method. The results of HRTEM, XPS, ESR, PL and UV-vis DRS verify that surface oxygen vacancies can form on the surface of TiO2 and the concentrations of bulk single-electron-trapped oxygen vacancies and surface oxygen vacancies increase with the increase of the reduction degree. Combining the evaluation of photocatalytic hydrogen production with the analysis of positron annihilation lifetime spectra, it is proved that the concentration ratio of bulk single-electron-trapped oxygen vacancies/surface oxygen vacancies plays the key role in the photocatalytic hydrogen production of TiO2, and the optimal ratio of bulk single-electron-trapped oxygen vacancies/surface oxygen vacancies leads to the best photoactivity.
引用
收藏
页码：2809 / 2817
页数：9
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