Suppression of the water splitting back reaction on GaN:ZnO photocatalysts loaded with core/shell cocatalysts, investigated using a μ-reactor

被引：46

作者：

Dionigi, Fabio ^{[1
]}

Vesborg, Peter C. K. ^{[1
]}

Pedersen, Thomas ^{[2
]}

Hansen, Ole ^{[1
,2
]}

Dahl, Soren ^{[1
]}

Xiong, Anke ^{[3
]}

Maeda, Kazuhiko ^{[3
,4
]}

Domen, Kazunari ^{[3
]}

Chorkendorff, Ib ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Phys, CINF, DTU, DK-2800 Lyngby, Denmark

[2] Tech Univ Denmark, DTU, Dept Micro & Nanotechnol, DK-2800 Lyngby, Denmark

[3] Univ Tokyo, Dept Chem Syst Engn, Bunkyo Ku, Tokyo 1138656, Japan

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

来源：

JOURNAL OF CATALYSIS | 2012年 / 292卷

基金：

新加坡国家研究基金会;

关键词：

Photocatalysis; Hydrogen; Core/shell; Water splitting; GaN:ZnO; Hydrogen oxidation; (GA1-XZNX)(N1-XOX) SOLID-SOLUTION; MIXED-OXIDE NANOPARTICLES; HYDROGEN OXYGEN REACTION; VISIBLE-LIGHT-DRIVEN; EVOLUTION; PLATINUM; GAN; REDUCTION; MODEL; ZNO;

D O I：

10.1016/j.jcat.2012.03.021

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：

Using silicon-based p-reactors, we have studied the photocatalytic water splitting reaction and the catalytic back reaction on the same catalysts. GaN:ZnO without cocatalyst and loaded with Rh, Pt, Cr2O3/Rh, Cr2O3/Pt, and Rh-Cr mixed oxide has been tested for gas-phase photocatalytic water splitting. The results confirm the high activity observed in liquid-phase experiments with Cr2O3/Rh and Rh-Cr mixed oxide as cocatalysts. To investigate the reason of this enhanced activity, the back reaction was studied by reacting stoichiometric H-2/O-2 and monitoring the water molecules produced. The comparison of the two experiments shows that the suppression of the back reaction with the core/shell cocatalysts and the Rh-Cr mixed oxide corresponds to an increase in the net photocatalytic water splitting activity. The fact that the back reaction is not completely suppressed with Cr2O3/Pt compared to Cr2O3/Rh may be the cause of the higher net activity of the Cr2O3/Rh. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：26 / 31

页数：6

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