Photocatalytic hydrogen production from aqueous methanol solutions under visible light over Na(BixTa1-x)O3 solid-solution

被引：84
作者：
Li, Zhonghua [1 ]
Wang, Yanxin [1 ]
Liu, Jiawen [2 ]
Chen, Gang [1 ]
Li, Yingxuan [1 ]
Zhou, Chao [1 ]
机构：
[1] Harbin Inst Technol, Sch Sci, Dept Chem, Harbin 150001, Peoples R China
[2] Harbin Normal Univ, Coll Chem & Chem Engn, Harbin 150025, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2009年 / 34卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Visible light; Hydrothermal synthesis; Density functional calculations; Hydrogen production; Photocatalyst; TANTALATE PHOTOCATALYSTS; WATER; NATAO3; H-2; IRRADIATION; DECOMPOSITION; O-2; EVOLUTION; TEMPERATURE; PROPERTY;
D O I：
10.1016/j.ijhydene.2008.10.027
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A series of equivalent substitution solid-solution Na(BixTa1-x)O-3 (x = 0-0. 10) was prepared by a simple hydrothermal method using Ta2O5 and NaBiO3 as precursors. The Na (Bi0.08Ta0.92)O-3 photocatalyst exhibited the highest performance of H-2 evolution (59.48 mu mol h(-1) g(-1)) under visible-light irradiation (lambda > 400 nm) without co-catalyst, whereas no H-2 evolution is observed for NaTaO3 under the same conditions. The UV-Vis spectra indicate that the Na(Bi0.08Ta0.92)O-3 powders can absorb not only ultraviolet light like pure NaTaO3 powder but also the visible-light spectrum. The absorption edge corresponds to a band gap of 2.88 eV. The results of density functional theory calculation illuminate that the visible-light absorption bands in the Na(BixTa1-x)O-3 catalysts are attributed to the band transition from the O2p to the Bi2s + 2p + Ta5d hybrid orbital. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：147 / 152
页数：6
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