Surface-Alkalinization-Induced Enhancement of Photocatalytic H2 Evolution over SrTiO3-Based Photocatalysts

被引：347

作者：

Ouyang, Shuxin ^{[1
]}

Tong, Hua ^{[2
,3
]}

Umezawa, Naoto ^{[1
,3
,4
]}

Cao, Junyu ^{[1
]}

Li, Peng ^{[1
,2
]}

Bi, Yingpu ^{[2
]}

Zhang, Yuanjian ^{[2
]}

Ye, Jinhua ^{[1
,2
,3
]}

机构：

[1] Natl Inst Mat Sci, Environm Remediat Mat Unit, Tsukuba, Ibaraki 3050047, Japan

[2] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton WPI MANA, Tsukuba, Ibaraki 3050047, Japan

[3] Tianjin Univ, Sch Mat Sci & Engn, TU NIMS Joint Res Ctr, Tianjin 300072, Peoples R China

[4] Japan Sci & Technol Agcy JST, PRESTO, Kawaguchi, Saitama 3320012, Japan

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 04期

基金：

日本科学技术振兴机构;

关键词：

VISIBLE-LIGHT IRRADIATION; HYDROGEN GENERATION; NANOWIRE ARRAYS; TIO2; SURFACES; WATER; NANOSTRUCTURES; ANATASE; FILM;

D O I：

10.1021/ja210610h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A strategy of reaction-environment modulation was employed to change the surface property of a semiconductor photocatalyst to enhance its photocatalytic performance. Surface alkalinization induced by a high alkalinity of the solution environment significantly shifted the surface energy band of a SrTiO3 photocatalyst to a more negative level, supplying a strong potential for H2O reduction and consequently promoting the photocatalytic efficiency of H-2 evolution. This mechanism is also applicable for visible-light-sensitive La,Cr-codoped SrTiO3 photocatalyst, which hence, could achieve a high apparent quantum efficiency of 25.6% for H-2 evolution in CH3OH aqueous solution containing 5 M NaOH at an incident wavelength of 425 +/- 12 nm.

引用

页码：1974 / 1977

页数：4

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