Highly Efficient Solar Water Splitting from Transferred TiO2 Nanotube Arrays

被引:98
作者
Cho, In Sun [1 ,3 ]
Choi, Jongmin [2 ]
Zhang, Kan [4 ]
Kim, Sung June [4 ]
Jeong, Myung Jin [4 ]
Cai, Lili [3 ]
Park, Taiho [2 ]
Zheng, Xiaolin [3 ]
Park, Jong Hyeok [4 ]
机构
[1] Ajou Univ, Dept Mat Sci & Engn & Energy Syst Res, Suwon 443749, South Korea
[2] Pohang Univ Sci & Technol, Dept Chem Engn, Pohang, Kyoungbuk, South Korea
[3] Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA
[4] Yonsei Univ, Dept Chem & Biomol Engn, Seoul 120749, South Korea
关键词
TiO2; nanotubes; transfer; flame reduction; chemical reduction; synergistic effects; photoelectrochemical water splitting; NANOWIRE ARRAYS; PERFORMANCE; REDUCTION; CARBON; CELLS;
D O I
10.1021/acs.nanolett.5b01406
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report a synergistic effect of flame and chemical reduction methods to maximize the efficiency of solar water splitting in transferred TiO2 nanotube (TNT) arrays on a transparent conducting oxide (TCO) substrate. The flame reduction method (>1000 degrees C) leads to few oxygen vacancies in the anatase TNT arrays, but it exhibits unique advantages for excellent interfacial characteristics between transferred TNT arrays and TCO substrates, which subsequently induce a cathodic on-set potential shift and sharp photocurrent evolution. By contrast, the employed chemical reduction method for TNT arrays/TCO gives rise to an abrupt increase in photocurrent density, which results from the efficient formation of oxygen vacancies in the anatase TiO2 phase, but a decrease in charge transport efficiency with increasing chemical reduction time. We show that flame reduction followed by chemical reduction could significantly improve the saturation photocurrent density and interfacial property of TNT arrays/TCO photoanodes simultaneously without mechanical fracture via the synergistic effects of coreducing methods.
引用
收藏
页码:5709 / 5715
页数:7
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