A CU2O/TiO2 heterojunction thin film cathode for photoelectrocatalysis

被引:403
作者
Siripala, W [1 ]
Ivanovskaya, A [1 ]
Jaramillo, TF [1 ]
Baeck, SH [1 ]
McFarland, EW [1 ]
机构
[1] Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA
关键词
photocatalyst; hydrogen; photoelectrode; heterojunction photocathode;
D O I
10.1016/S0927-0248(02)00343-4
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
A thin film heterojunction photocathode was developed consisting of 100 nm of n-type titanium dioxide (TiO2) cathode surface deposited on p-type cuprous oxide (Cu2O). The cuprous oxide was deposited electrochemically on Ti foil. A photocurrent of 0.7 mA/cm(2) (at -1 V bias) and an open circuit photovoltage of 460 mV were obtained under an illumination of 700 W/m(2). The photoresponse as a function of pH demonstrated that the TiO2 film protected the Cu2O underlayer against corrosion. These results suggest that using a simple and inexpensive heterostucture configuration, the corrosion limitations Of Cu2O alone may be overcome while maintaining a relatively high efficiency for photoelectrolysis. (C) 2002 Elsevier Science B.V. All rights reserved.
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页码:229 / 237
页数:9
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