Nitrogen-Doped Anatase Nanofibers Decorated with Noble Metal Nanoparticles for Photocatalytic Production of Hydrogen

详细信息    查看全文

• 作者：Ming-Chung Wu ; Jussi Hiltunen ; András Sápi ; Anna Avila ; William Larsson ; Hsueh-Chung Liao ; Mika Huuhtanen ; Géza Tóth ; Andrey Shchukarev ; Noémi Laufer ; Ákos Kukovecz ; Zoltán Kónya ; Jyri-Pekka Mikkola ; Riitta Keiski ; Wei-Fang Su ; Yang-Fang Chen ; Heli Jantunen ; Pulickel M. Ajayan ; Robert Vajtai ; Krisztián Kordás
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：June 28, 2011
• 年：2011
• 卷：5
• 期：6
• 页码：5025-5030
• 全文大小：889K
• 年卷期：0
• ISSN：1936-086X

文摘

We report the synthesis of N-doped TiO₂ nanofibers and high photocatalytic efficiency in generating hydrogen from ethanol–water mixtures under UV-A and UV-B irradiation. Titanate nanofibers synthesized by hydrothermal method are annealed in air and/or ammonia to achieve N-doped anatase fibers. Depending on the synthesis route, either interstitial N atoms or new N–Ti bonds appear in the lattice, resulting in slight lattice expansion as shown by XPS and HR-TEM analysis, respectively. These nanofibers were then used as support for Pd and Pt nanoparticles deposited with wet impregnation followed by calcination and reduction. In the hydrogen generation tests, the N-doped samples were clearly outperforming their undoped counterparts, showing remarkable efficiency not only under UV-B but also with UV-A illumination. When 100 mg of catalyst (N-doped TiO₂ nanofiber decorated with Pt nanoparticles) was applied to 1 L of water–ethanol mixture, the H₂ evolution rates were as high as 700 μmol/h (UV-A) and 2250 μmol/h (UV-B) corresponding to photo energy conversion percentages of ∼3.6 and ∼12.3%, respectively.