Enhancing Visible Light Photo-oxidation of Water with TiO2 Nanowire Arrays via Cotreatment with H2 and NH3: Synergistic Effects between Ti3+ and N

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• 作者：Son Hoang ; Sean P. Berglund ; Nathan T. Hahn ; Allen J. Bard ; C. Buddie Mullins
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：February 29, 2012
• 年：2012
• 卷：134
• 期：8
• 页码：3659-3662
• 全文大小：276K
• 年卷期：v.134,no.8(February 29, 2012)
• ISSN：1520-5126

文摘

We report a synergistic effect involving hydrogenation and nitridation cotreatment of TiO₂ nanowire (NW) arrays that improves the water photo-oxidation performance under visible light illumination. The visible light (>420 nm) photocurrent of the cotreated TiO₂ is 0.16 mA/cmp>2p> and accounts for 41% of the total photocurrent under simulated AM 1.5 G illumination. Electron paramagnetic resonance (EPR) spectroscopy reveals that the concentration of Tip>3+p> species in the bulk of the TiO₂ following hydrogenation and nitridation cotreatment is significantly higher than that of the sample treated solely with ammonia. It is believed that the interaction between the N-dopant and Tip>3+p> is the key to the extension of the active spectrum and the superior visible light water photo-oxidation activity of the hydrogenation and nitridation cotreated TiO₂ NW arrays.