N-Doped TiO2 Nanobelts with Coexposed (001) and (101) Facets and Their Highly Efficient Visible-Light-Driven Photocatalytic Hydrogen Production

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• 作者：Shuchao Sun ; Peng Gao ; Yurong Yang ; Piaoping Yang ; Yujin Chen ; Yanbo Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：8
• 期：28
• 页码：18126-18131
• 全文大小：445K
• 年卷期：0
• ISSN：1944-8252

文摘

To narrow the band gap (3.2 eV) of TiO₂ and extend its practical applicability under sunlight, the doping with nonmetal elements has been used to tune TiO₂ electronic structure. However, the doping also brings new recombination centers among the photoinduced charge carriers, which results in a quantum efficiency loss accordingly. It has been proved that the {101} facets of anatase TiO₂ are beneficial to generating and transmitting more reductive electrons to promote the H₂-evolution in the photoreduction reaction, and the {001} facets exhibit a higher photoreactivity to accelerate the reaction involved of photogenerated hole. Thus, it was considered by us that using the surface heterojunction composed of both {001} and {101} facets may depress the disadvantage of N doping. Fortunately, we successfully synthesized anatase N-doped TiO₂ nanobelts with a surface heterojunction of coexposed (101) and (001) facets. As expected, it realized the charge pairs’ spatial separation and showed higher photocatalytic activity under a visible-light ray: a hydrogen generation rate of 670 μmol h^–1 g^–1 (much higher than others reported previously in literature of N-doped TiO₂ nanobelts).