Visible Light-Driven H2 Production over Highly Dispersed Ruthenia on Rutile TiO2 Nanorods

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• 作者：Thuy-Duong Nguyen-Phan ; Si Luo ; Dimitriy Vovchok ; Jordi Llorca ; Jesús Graciani ; Javier Fernández Sanz ; Shawn Sallis ; Wenqian Xu ; Jianming Bai ; Louis F. J. Piper ; Dmitry E. Polyansky ; Etsuko Fujita ; Sanjaya D. Senanayake ; Dario J. Stacchiola ; José A. Rodriguez
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：January 4, 2016
• 年：2016
• 卷：6
• 期：1
• 页码：407-417
• 全文大小：686K
• ISSN：2155-5435

文摘

The immobilization of miniscule quantities of RuO₂ (～0.1%) onto one-dimensional (1D) TiO₂ nanorods (NRs) allows H₂ evolution from water under visible light irradiation. Rod-like rutile TiO₂ structures, exposing preferentially (110) surfaces, are shown to be critical for the deposition of RuO₂ to enable photocatalytic activity in the visible region. The superior performance is rationalized on the basis of fundamental experimental studies and theoretical calculations, demonstrating that RuO₂(110) grown as 1D nanowires on rutile TiO₂(110), which occurs only at extremely low loads of RuO₂, leads to the formation of a heterointerface that efficiently adsorbs visible light. The surface defects, band gap narrowing, visible photoresponse, and favorable upward band bending at the heterointerface drastically facilitate the transfer and separation of photogenerated charge carriers.