Rutile titanium dioxide prepared by hydrogen reduction of Degussa P25 for highly efficient photocatalytic hydrogen evolution

被引：58

作者：

Amano, Fumiaki ^{[1
]}

Nakata, Masashi ^{[1
]}

Yamamoto, Akira ^{[2
,3
]}

Tanaka, Tsunehiro ^{[2
,3
]}

机构：

[1] Univ Kitakyushu, Grad Sch Environm Engn, Dept Chem & Environm Engn, Wakamatsu Ku, 1-1 Hibikino, Kitakyushu, Fukuoka 8080135, Japan

[2] Kyoto Univ, Grad Sch Engn, Dept Mol Engn, Nishikyo Ku, Kyoto 6158510, Japan

[3] Kyoto Univ, Elements Strategy Initiat Catalysts & Batteries, Nishikyo Ku, 1-30 Goryo Ohara, Kyoto 6158245, Japan

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2016年 / 6卷 / 14期

基金：

日本学术振兴会;

关键词：

TIO2; PARTICLES; WATER OXIDATION; BAND ALIGNMENT; ABSORPTION-SPECTROSCOPY; ANATASE TIO2; POWDER; PHASES; OXIDE; NANOPARTICLES; SEPARATION;

D O I：

10.1039/c6cy00296j

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：

Degussa (Evonik) TiO2 P25 consisting of a mixture of anatase and rutile crystallites is a well-known commercial material with high photocatalytic efficiency. The mixture of anatase and rutile phases in P25 is reportedly more active than the individual polymorphs of TiO2. Contrary to this viewpoint, we demonstrate that H-2-reduced rutile TiO2 is much more active than mixed-phase P25 for photocatalytic H-2 evolution under ultraviolet irradiation. An important factor to improve the photocatalytic activity of rutile TiO2 is H-2 reduction treatment. H-2-reduced rutile TiO2 outperforms anatase-rich TiO2 because of the wider absorption range caused by its smaller band gap (3.0 eV for rutile and 3.2 eV for anatase). The apparent quantum efficiency for H-2 evolution of H-2-reduced rutile TiO2 was estimated to be 46% under 390 nm irradiation, which was 3.3 times higher than that of mixed-phase P25. This highly efficient rutile photocatalyst is easily fabricated from P25 by H-2 reduction treatment at 700 degrees C for 2 h.

引用

页码：5693 / 5699

页数：7