期刊
JOURNAL OF POWER SOURCES
卷 173, 期 2, 页码 816-821出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2007.05.065
关键词
photoelectrochemical cell; titanium dioxide; nonstoichiometry; magneli phases; photoelectrochemical properties; quantum efficiency
Polycrystalline TiO2-x pellets were equilibrated at 1220-1420 K in a flow of Ar + 7 vol. % H-2 gas mixture. The resulting deviation x from stoichiometric composition of titanium dioxide was determined gravimetrically. X-ray diffractometry revealed coexistence of rutile with TinO2n-1 Magneli phases. Optical reflectance and photocurrent spectroscopies served as experimental methods of the band gap determination. Polycrystalline TiO2-x were used as photoanodes in a photoelectrochentical cell. The photocurrent response to the applied voltage was studied. It was found that TiO2-x with x ca. 0.006 exhibited the best photoelectrochemical performance. (c) 2007 Elsevier B.V. All rights reserved.
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