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[资源] TiO2制备H2的最新进展—>2007综述

TiO2制备H2的最新进展－review

http://www.divshare.com/download/1299690-084

A review and recent developments in photocatalytic water-splitting using TiO2 for hydrogen production

Renewable and Sustainable Energy Reviews
11 (2007) 401–425

Abstract
Nano-sized TiO2 photocatalytic water-splitting technology has great potential for low-cost,
environmentally friendly solar-hydrogen production to support the future hydrogen economy.
Presently, the solar-to-hydrogen energy conversion efficiency is too low for the technology to be
economically sound. The main barriers are the rapid recombination of photo-generated electron/hole
pairs as well as backward reaction and the poor activation of TiO2 by visible light. In response to
these deficiencies, many investigators have been conducting research with an emphasis on effective
remediation methods. Some investigators studied the effects of addition of sacrificial reagents and
carbonate salts to prohibit rapid recombination of electron/hole pairs and backward reactions. Other
research focused on the enhancement of photocatalysis by modification of TiO2 by means of metal
loading, metal ion doping, dye sensitization, composite semiconductor, anion doping and metal ionimplantation.
This paper aims to review the up-to-date development of the above-mentioned
technologies applied to TiO2 photocatalytic hydrogen production. Based on the studies reported in
the literature, metal ion-implantation and dye sensitization are very effective methods to extend the
activating spectrum to the visible range. Therefore, they play an important role in the development of
efficient photocatalytic hydrogen production.
r 2006 Elsevier Ltd. All rights reserved.

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Contents
1. Introduction . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 402
2. Mechanisms of semiconductor photocatalytic water-splitting or hydrogen production . . . 403
3. Chemical additives for H2 production enhancement . . . .. .  . . . 405
3.1. Addition of electron donors . . . . . . . . . . . . . . . . . . . .. . . . . 405
3.2. Addition of carbonate salts to suppress backward reaction . . . .  . . 406
4. Photocatalyst modification techniques to enhance H2 production .  . . . . 408
4.1. Noble metal loading . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 408
4.2. Ion doping . . . . . . . . . . . . . . . .  . . . . . . . . . . . . . . . . . . . . . 409
4.2.1. Metal ion doping . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 409
4.2.2. Anion doping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
4.3. Sensitization . . . . . . . . . . . . .  . . . . . . . . . . . . . . . . . . . 412
4.3.1. Dye sensitization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412
4.3.2. Composite semiconductors . . . . .. . . . . . . . . . . . . . . . . . . . . . . 415
4.4. Metal ion-implantation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417
5. Conclusions. . . . . . . . . . . . . . . . . . . . . . . .  . . . . . . . . . . . . . . 418
References . . . . . . . . . . . . . . . . . . . . .  . . . . . . . . . . . . . .

[ Last edited by jackchen145 on 2007-7-21 at 00:15 ]

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