Characterization of Oxygen Vacancy Associates within Hydrogenated TiO2: A Positron Annihilation Study

被引：507
作者：
Jiang, Xudong [1 ,2 ]
Zhang, Yupeng [1 ,2 ]
Jiang, Jing [1 ,2 ]
Rong, Yongsen [1 ,2 ]
Wang, Yancheng [1 ,2 ]
Wu, Yichu [1 ,2 ]
Pan, Chunxu [1 ,2 ,3 ]
机构：
[1] Wuhan Univ, Sch Phys & Technol, Hubei Nucl Solid Phys Key Lab, Wuhan 430072, Peoples R China
[2] Wuhan Univ, MOE Key Lab Artificial Micro & Nanostruct, Wuhan 430072, Peoples R China
[3] Wuhan Univ, Ctr Electron Microscopy, Wuhan 430072, Peoples R China
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 42期
基金：
美国国家科学基金会;
关键词：
ENHANCED PHOTOCATALYTIC ACTIVITY; VISIBLE-LIGHT; SURFACE-DEFECTS; NANOCRYSTALS; ABSORPTION; POWDERS; WATER;
D O I：
10.1021/jp307573c
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：
This paper introduces a novel method for characterizing the oxygen vacancy associates in hydrogenation-modified TiO2 by using a positron annihilation lifetime spectroscopy (PALS). It was found that a huge number of small neutral Ti3+-oxygen vacancy associates, some larger size vacancy clusters, and a few voids of vacancy associates were introduced into hydrogenated TiO2. The defects blurred the atomic lattice high-resolution transmission electron microscopy (HRTEM) images and brought about the emergence of new Raman vibration. X-ray photoelectron spectroscopy (XPS) measurement indicated that the concentration of oxygen vacancies was 3% in the TiO2 lattice. The photoluminescence (PL) spectroscopy, photocurrent, and degradation of methylene blue indicated that the oxygen vacancy associates introduced by hydrogenation retarded the charge recombination and therefore improved the photocatalytic activity remarkably.
引用
收藏
页码：22619 / 22624
页数：6
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