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

酸化チタン上でのX線誘起光触媒に関する研究

田村 和久   ; 大古 善久*; 河村 博行; 吉川 英樹*; 立間 徹*; 藤嶋 昭*; 水木 純一郎

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

バンドギャップエネルギーよりも数桁大きなエネルギーを持つX線をTiO$$_{2}$$及びSrTiO$$_{3}$$に照射した場合でもUV照射と同じ光電気化学反応が起きるかどうかについて検討した。その結果、TiO$$_{2}$$, SrTiO$$_{3}$$どちらの場合でもX線照射時に、UV照射時と同じく光電流・光電位・電気化学的酸化反応が確認された。また、X線照射時のIPCEが非常に高いことも明らかにした。

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.

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パーセンタイル:48.72

分野:Electrochemistry

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