Preparation of black TiO₂ by hydrogen plasma assisted chemical vapor deposition and its photocatalytic activity

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• 作者：Feng Teng ; Mingyang Li ; Caitian Gao ; Guozhi Zhang ; Peng Zhang ; Youqing Wang ; Lulu Chen ; Erqing Xie
• 关键词：Black TiO2 ; Hydrogen plasma ; Disorder layer ; Oxygen vacancy ; Chromium ions
• 刊名：Applied Catalysis B: Environmental
• 出版年：27 April, 2014
• 年：2014
• 卷：148-149
• 期：Complete
• 页码：339-343
• 全文大小：2292 K

文摘

Black TiO₂ attracts enormous attention due to its large solar absorption and excellent photocatalytic activity. An approach assisted by hot filament hydrogen plasma to synthesize the black TiO₂ nanostructure is presented in our work. The black TiO₂ possesses a larger solar absorption, especially in the visible and near infrared region. The measurement results show that the oxygen vacancy and TiH are the major impacts to form disorder layer and the coloration of black. High absorption of light and numerous active sites ensure the excellent photocatalytic activity for the black TiO₂ in the photo-oxidation of organic molecules in water. Considered that Cr has important effect on the electronic structure of TiO₂ reported by some researchers, Cr ions were introduced into the structure of TiO₂, but Cr ions play the opposite role for its photocatalytic activity because it plays a role in the recombination of photo-generated carriers.