Photocatalytic Water Oxidation by Hematite/Reduced Graphene Oxide Composites

被引：221

作者：

Meng, Fanke ^{[1
]}

Li, Jiangtian ^{[1
]}

Cushing, Scott K. ^{[2
]}

Bright, Joeseph ^{[1
]}

Zhi, Mingjia ^{[1
]}

Rowley, Joseph D. ^{[2
]}

Hong, Zhanglian ^{[3
]}

Manivannan, Ayyakkannu ^{[4
]}

Bristow, Alan D. ^{[2
]}

Wu, Nianqiang ^{[1
]}

机构：

[1] W Virginia Univ, Dept Mech & Aerosp Engn, Morgantown, WV 26506 USA

[2] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA

[3] Zhejiang Univ, Dept Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China

[4] US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA

来源：

ACS CATALYSIS | 2013年 / 3卷 / 04期

基金：

美国国家科学基金会;

关键词：

photocatalyst; hematite; graphene; water splitting transient absorption spectroscopy; THIN-FILM; PERFORMANCE; NANOSTRUCTURE; NANOPARTICLES; MONOLAYERS; NANOSHEETS; HYDROGEN; METAL;

D O I：

10.1021/cs300740e

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：

The photocatalytic water oxidation activity of hematite (alpha-Fe2O3) has been greatly enhanced by incorporating hematite nanoparticles on the reduced graphene oxide (rGO) nanosheets. Photoelectrochemical measurement results show that coupling the hematite nanoparticles with the rGO greatly increases the photocurrent and reduces the charge recombination rate. Transient absorption spectroscopy and time-domain terahertz spectroscopy have provided the direct evidence that the photogenerated electrons have transferred as the mobile carriers from alpha-Fe2O3 to rGO, which enhances the charge separation and suppresses the charge recombination. This work has provided new insight into the mechanism of photocatalysis enhancement by reduced graphene oxide, which has implications in the design of semiconductor/graphene heterojunction photocatalysts.

引用

页码：746 / 751

页数：6

共 36 条

[31] Carrier dynamics in semiconductors studied with time-resolved terahertz spectroscopy [J].

Ulbricht, Ronald ;

Hendry, Euan ;

Shan, Jie ;

Heinz, Tony F. ;

Bonn, Mischa .

REVIEWS OF MODERN PHYSICS, 2011, 83 (02) :543-586

[32] Large Ultrathin Anatase TiO2 Nanosheets with Exposed {001} Facets on Graphene for Enhanced Visible Light Photocatalytic Activity [J].

Wang, Wan-Sheng ;

Wang, Dong-Hong ;

Qu, Wen-Gang ;

Lu, Li-Qiang ;

Xu, An-Wu .

JOURNAL OF PHYSICAL CHEMISTRY C, 2012, 116 (37) :19893-19901

[33] Shape-Enhanced Photocatalytic Activity of Single-Crystalline Anatase TiO2 (101) Nanobelts [J].

Wu, Nianqiang ;

Wang, Jin ;

Tafen, De Nyago ;

Wang, Hong ;

Zheng, Jian-Guo ;

Lewis, James P. ;

Liu, Xiaogang ;

Leonard, Stephen S. ;

Manivannan, Ayyakkannu .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2010, 132 (19) :6679-6685

[34] Interaction of fatty acid monolayers with cobalt nanoparticles [J].

Wu, NQ ;

Fu, L ;

Su, M ;

Aslam, M ;

Wong, KC ;

Dravid, VP .

NANO LETTERS, 2004, 4 (02) :383-386

[35] The preparation, characterization, and their photocatalytic activities of rare-earth-doped TiO2 nanoparticles [J].

Xu, AW ;

Gao, Y ;

Liu, HQ .

JOURNAL OF CATALYSIS, 2002, 207 (02) :151-157

[36] Solar Water Oxidation by Composite Catalyst/α-Fe2O3 Photoanodes [J].

Zhong, Diane K. ;

Sun, Jianwei ;

Inumaru, Hiroki ;

Gamelin, Daniel R. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2009, 131 (17) :6086-+

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