期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 40, 期 14, 页码 4945-4950出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.01.102
关键词
Anatase TiO2 nanoparticle; Microspheres; Gelatin; Sol-gel; Hydrogen storage
资金
- National Natural Science Foundation of China [51245010, 51002079, 51472123]
- Portugal FCT [PEst-C/FIC/UI0036/2014, PTDC/FIS/116146/2009]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/116146/2009] Funding Source: FCT
TiO2 is an important photocatalyst candidate for solar energy or hydrogen energy harvesting. Creation of porous structures or high surface area within TiO2 microspheres may potentially address the challenge to improve their efficiency. In present work, we report the sol-gel fabrication of mesoporous TiO2 microspheres that assembled from nanoparticles with the assistance of gelatin template. The phase structure, morphology, and mesoporous characteristics were analyzed by X-ray diffraction, transmission electron microscopy, and BET measurements. Particularly, the gelatin-assisted fabricated TiO2 nanoparticles (similar to 10-20 nm) were achieved to assemble TiO2 microspheres with diameters of 0.2-0.5 mu m, which yielded a typical type-IV BET isotherm curve (N-2 hysteresis loop) with a large surface area of 98.3 m(2)/g and a small pore size of 11.9 nm. A simplified model was proposed to investigate the effect mechanism of gelatin on the formation of TiO2 mesoporous microspheres. The room temperature pressure-dependent hydrogen evolution of the gelatin-assisted fabricated TiO2 nanostructures has also been investigated, suggesting that gelatin favors high surface area and improves the hydrogen storage performance, and the achieved TiO2 microspheres could be potential candidates to be utilized as the photocatalyst for hydrogen evolution. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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