Enhancement of photocatalytic activity of cadmium sulfide for hydrogen evolution by photoetching

被引：96

作者：

Li, Yuexiang ^{[1
]}

Du, Juan ^{[1
]}

Peng, Shaoqin ^{[1
]}

Xi, Dan ^{[1
]}

Lu, Gongxuan ^{[2
]}

Li, Shuben ^{[2
]}

机构：

[1] Nanchang Univ, Dept Chem, Nanchang 330031, Peoples R China

[2] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2008年 / 33卷 / 08期

关键词：

photocatalysis; Pt/CdS; hydrogen; photoetching; defects;

D O I：

10.1016/j.ijhydene.2008.02.023

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：

CdS semiconductor photocatalyst was synthesized by a solvent thermal process. Platinum (Pt) was loaded on the CdS by photodeposition. The samples were characterized by XRD, BET, TEM, DRS and XPS techniques. The activities of Pt/CdS photocatalysts under visible light were evaluated by hydrogen production using formic acid as electron donor. The photoetching of CdS was monitored by measuring dissolved Cd2+. The activity of Pt/CdS with 1 h photoetching treatment increases by 126% compared to the initial photocatalyst. However, excess photoetching decreases the photocatalytic activity. A distinct correlation between photoetching and increase of the activity is observed. Oxygen and platinum play an important role in the photoetching process. The photocatalytic activity is enhanced through decreasing agglomeration of the CdS particles to increase the specific surface area, modifying particle morphology, and removing selectively grain boundary defects which are recombination centers of photoinduced electron-hole pairs. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

引用

页码：2007 / 2013

页数：7

共 23 条

[1] An overview on semiconductor particulate systems for photoproduction of hydrogen [J].

Ashokkumar, M .

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 1998, 23 (06) :427-438

[2]

Buehler N., 1984, J PHYS CHEM-US, V88, P3261

[3] ELECTROCHEMICAL PHOTOLYSIS OF WATER AT A SEMICONDUCTOR ELECTRODE [J].

FUJISHIMA, A ;

HONDA, K .

NATURE, 1972, 238 (5358) :37-+

[4] EFFECT OF SEMICONDUCTOR ON PHOTOCATALYTIC DECOMPOSITION OF LACTIC-ACID [J].

HARADA, H ;

SAKATA, T ;

UEDA, T .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1985, 107 (06) :1773-1774

[5] ENVIRONMENTAL APPLICATIONS OF SEMICONDUCTOR PHOTOCATALYSIS [J].

HOFFMANN, MR ;

MARTIN, ST ;

CHOI, WY ;

BAHNEMANN, DW .

CHEMICAL REVIEWS, 1995, 95 (01) :69-96

[6] SUPPRESSION OF SURFACE DISSOLUTION OF CDS PHOTOANODE BY REDUCING AGENTS [J].

INOUE, T ;

WATANABE, T ;

FUJISHIMA, A ;

HONDA, K .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1977, 124 (05) :719-722

[7] Oxysulfide Sm2Ti2S2O5 as a stable photocatalyst for water oxidation and reduction under visible light irradiation (λ ≤ 650 nm) [J].

Ishikawa, A ;

Takata, T ;

Kondo, JN ;

Hara, M ;

Kobayashi, H ;

Domen, K .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (45) :13547-13553

[8] A novel method for the preparation of a highly stable and active CdS photocatalyst with a special surface nanostructure [J].

Jing, Dengwei ;

Guo, Liejin .

JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (23) :11139-11145

[9] Efficient photochemical water splitting by a chemically modified n-TiO2 2 [J].

Khan, SUM ;

Al-Shahry, M ;

Ingler, WB .

SCIENCE, 2002, 297 (5590) :2243-2245

[10] Photocatalytic hydrogen production by direct sun light from sulfide/sulfite solution [J].

Koca, A ;

Sahin, M .

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2002, 27 (04) :363-367

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