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

共 29 条

[1] Gas phase photocatalytic water splitting with Rh2-yCryO3/GaN:ZnO in μ-reactors [J].

Dionigi, Fabio ;

Vesborg, Peter C. K. ;

Pedersen, Thomas ;

Hansen, Ole ;

Dahl, Soren ;

Xiong, Anke ;

Maeda, Kazuhiko ;

Domen, Kazunari ;

Chorkendorff, Ib .

ENERGY & ENVIRONMENTAL SCIENCE, 2011, 4 (08) :2937-2942

[2] TiO2 photocatalysis and related surface phenomena [J].

Fujishima, Akira ;

Zhang, Xintong ;

Tryk, Donald A. .

SURFACE SCIENCE REPORTS, 2008, 63 (12) :515-582

[3] KINETICS OF THE HYDROGEN OXYGEN REACTION ON PLATINUM [J].

HELLSING, B ;

KASEMO, B ;

ZHDANOV, VP .

JOURNAL OF CATALYSIS, 1991, 132 (01) :210-228

[4] Highly sensitive silicon microreactor for catalyst testing [J].

Henriksen, Toke R. ;

Olsen, Jakob L. ;

Vesborg, Peter ;

Chorkendorff, Ib ;

Hansen, Ole .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2009, 80 (12)

[5] Heterogeneous photocatalyst materials for water splitting [J].

Kudo, Akihiko ;

Miseki, Yugo .

CHEMICAL SOCIETY REVIEWS, 2009, 38 (01) :253-278

[6] Nanoplasmonic Probes of Catalytic Reactions [J].

Larsson, Elin M. ;

Langhammer, Christoph ;

Zoric, Igor ;

Kasemo, Bengt .

SCIENCE, 2009, 326 (5956) :1091-1094

[7] Catalytic activity-d-band center correlation for the O2 reduction reaction on platinum in alkaline solutions [J].

Lima, F. H. B. ;

Zhang, J. ;

Shao, M. H. ;

Sasaki, K. ;

Vukmirovic, M. B. ;

Ticianelli, E. A. ;

Adzic, R. R. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (01) :404-410

[8] GaN:ZnO solid solution as a photocatalyst for visible-light-driven overall water splitting [J].

Maeda, K ;

Takata, T ;

Hara, M ;

Saito, N ;

Inoue, Y ;

Kobayashi, H ;

Domen, K .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (23) :8286-8287

[9] Photocatalyst releasing hydrogen from water - Enhancing catalytic performance holds promise for hydrogen production by water splitting in sunlight. [J].

Maeda, K ;

Teramura, K ;

Lu, DL ;

Takata, T ;

Saito, N ;

Inoue, Y ;

Domen, K .

NATURE, 2006, 440 (7082) :295-295

[10] Overall water splitting on (Ga1-xZnx)(N1-xOx) solid solution photocatalyst:: Relationship between physical properties and photocatalytic activity [J].

Maeda, K ;

Teramura, K ;

Takata, T ;

Hara, M ;

Saito, N ;

Toda, K ;

Inoue, Y ;

Kobayashi, H ;

Domen, K .

JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (43) :20504-20510

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