X-ray induced photoelectrochemistry on TiO $_{2}$

Tamura, Kazuhisa ; Oko, Yoshihisa*; Kawamura, Hiroyuki; Yoshikawa, Hideki*; Tatsuma, Tetsu*; Fujishima, Akira*; Mizuki, Junichiro

The electrochemical behaviour of TiO $_{2}$ under X-ray irradiation was studied. Under X-ray irradiation a current, a negative shift in the rest potential, and electrochemical oxidation and decomposition of [Fe $^{rm II}$ (CN) $_{6}$ ] $^{4-}$ were clearly observed. The incident photon-current conversion efficiency and energy conversion efficiency was 400-2000% and 0.2-2%, respectively, depending on sample conditions. These results show that the photoelectrochemical reactions were promoted by X-rays with a high incident photon-current conversion efficiency. The photocurrent and photopotential were observed above 4.965 keV, which corresponds to the Ti-K edge, indicating that electron-hole pairs are formed during the relaxation process of the excited Ti atoms.

Language	:	English
Journal	:	Electrochimica Acta
Volume	:	52
Number	:	24
Pages	:	p.6938 - 6942
Publication Year/Month	:	2007/08
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Paper URL	:	https://doi.org/10.1016/j.electacta.2007.05.011
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Keywords	:	no keyword
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Press Release	:	X線照射下における酸化チタンの光触媒作用の発現を確認; 光触媒の新たな応用に期待
Article of JAEA R&D Review	:
Cooperating Institute	:	東京大学

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Registration No. : AA20070869
JAEA Abstracts No. : 36000281
Paper Submission No. : 3608

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