期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 40, 期 42, 页码 14483-14491出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.05.180
关键词
Titania; Water splitting; EISA; Rietveld analysis; Transmission electron microscopy (TEM); Electrochemical properties
资金
- University of Sassari
- Regione Autonoma Sardegna
- P.O.R. SARDEGNA F.S.E.
- Generalitat de Catalunya and the Spanish MINECO [2009-SGR-1292, MAT2010-20616-C02-02]
- ICREA-Academia Award
- Spanish Ministerio de Economia y Competitividad (MINECO) [RYC-2012-10839]
- Fondazione Banco di Sardegna
We investigated the influence of the microstructure, texture and the relative amount of anatase and rutile phases on the photoelectrocatalytic H-2 evolution over mesoporous TiO2 (m-TiO2). This study was carried out by means of ex-situ powder X-ray diffraction (XRPD), N-2 physisorption, transmission electron microscopy (TEM), and phothelectrolysis measurements. The synthesis of nanocrystalline TiO2 powders with different anatase/rutile weight ratios was successfully approached by evaporation-induced self assembly (EISA) method simply varying the volume amount of TiCl4 and Ti(OBu)(4) (acid base pair) as metal precursors. In particular, m-TiO2 with anatase/rutile weight ratios similar to commercial TiO2 (P25) was obtained. The microstructure, texture and photocatalytic properties toward hydrogen evolution reaction (HER) of the as-synthesized TiO2 were compared with commercial P25. Interestingly, the m-TiO2 with a high surface area of 196 m(2)/g, uniform pore size and 87/13 anatase/rutile weight ratio, showed a significant increase in the photoactivity with respect to the powders richer in either anatase or ruffle phases. Furthermore, it was claimed that the crystallinity and specific surface area play a key role on the photocatalytic activity of the synthesized m-TiO2 samples. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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