Use of Pt/N-doped mesoporous-assembled nanocrystalline TiO2 for photocatalytic H2 production under visible light irradiation
Use of Pt/N-doped mesoporous-assembled nanocrystalline TiO2 for photocatalytic H2 production under visible light irradiation
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DOI：
10.1016/j.catcom.2008.10.029
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发表时间：
2009-01-25
影响因子：
3.7
通讯作者：
Chavadej, Sumaeth
中科院分区：
文献类型：
--
作者：
Sreethawong, Thammanoon;Laehsalee, Siriporn;Chavadej, Sumaeth
本工作首先采用溶胶-凝胶法合成了纳米晶介孔组装TiO 2光催化剂，然后以尿素与TiO 2的摩尔比为1：1进行尿素掺杂，再采用等体积浸渍法负载不同Pt含量的纳米晶介孔组装TiO 2光催化剂，在可见光照射下，以甲醇为牺牲电子给体，光催化分解水制氢。结果表明，Pt在N掺杂纳米晶介孔流血的TiO_2上的负载量为1.3wt%时，其光催化产氢活性明显提高。实验结果表明，Pt在纳米晶介孔组装TiO_2上的分散对提高光催化活性有重要作用。(C)2008 Elsevier B. V.保留所有权利。
In this work, nanocrystalline mesoporous-assembled TiO2 photocatalyst was initially synthesized by a sol-gel process with the aid of structure-directing surfactant, N-doped by calcining with urea at a urea:- TiO2 molar ratio of 1:1, and then loaded with various Pt contents via the incipient wetness impregnation method for photocatalytic H-2 production from water splitting using methanol as a sacrificial electron donor under visible light irradiation, The prepared photocatalysts were systematically characterized by N-2 adsorption-desorption analysis, XRD, TEM, and XPS. It was observed that the impregnation of Pt onto the N-doped nanocrystalline mesoporous-assem bled TiO2 considerably improved its photocatalytic H-2 production activity with the optimum Pt loading content of 1.3 wt% The experimental results clearly revealed that the Pt dispersion on the photocatalyst surface played a significant role in enhancing the photocatalytic activity. (C) 2008 Elsevier B.V. All rights reserved.