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• W2053115087 endingPage "2072" @default.
• W2053115087 startingPage "2067" @default.
• W2053115087 abstract "Hydrogen (<TEX>$H_2$</TEX>) treatment using a two-step <TEX>$TiO_2$</TEX> nanotube (TONT) film was performed under various annealing temperatures from <TEX>$350^{circ}C$</TEX> to <TEX>$550^{circ}C$</TEX> and significantly influenced the extent of hydrogen treatment in the film. Compared with pure TONT films, the hydrogen-treated TONT (H:TONT) film showed substantial improvement of material features from structural, optical and electronic aspects. In particular, the extent of enhancement was remarkable with increasing annealing temperature. Light absorption by the H:TONT film extended toward the visible region, which was attributable to the formation of sub-band-gap states between the conduction and valence bands, resulting from oxygen vacancies due to the <TEX>$H_2$</TEX> treatment. This increased donor concentration about 1.5 times higher and improved electrical conductivity of the TONT films. Based on these analyses and results, photoelectrochemical (PEC) performance was evaluated and showed that the H:TONT film prepared at <TEX>$550^{circ}C$</TEX> exhibited optimal PEC performance. Approximately twice higher photocurrent density of 0.967 <TEX>$mA/cm^2$</TEX> at 0.32 V vs. NHE was achieved for the H:TONT film (<TEX>$550^{circ}C$</TEX>) versus 0.43 <TEX>$mA/cm^2$</TEX> for the pure TONT film. Moreover, the solar-to-hydrogen efficiency (STH, <TEX>${eta}$</TEX>) of the H:TONT film was 0.95%, whereas a 0.52% STH efficiency was acquired for the TONT film. These results demonstrate that hydrogen treatment of TONT film is a simple and effective tool to enhance PEC performance with modifying the properties of the original material." @default.
• W2053115087 created "2016-06-24" @default.
• W2053115087 creator A5074976953 @default.
• W2053115087 creator A5078901131 @default.
• W2053115087 date "2013-07-20" @default.
• W2053115087 modified "2023-09-27" @default.
• W2053115087 title "Effect of Hydrogen Treatment on Anatase TiO₂Nanotube Arrays for Photoelectrochemical Water Splitting" @default.
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• W2053115087 doi "https://doi.org/10.5012/bkcs.2013.34.7.2067" @default.
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