期刊
JOURNAL OF CATALYSIS
卷 310, 期 -, 页码 67-74出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2012.12.003
关键词
Hydrogen production; Photocatalysis; Solid solution; Solar energy conversion; Visible light
资金
- PRESTO/JST program Chemical Conversion of Light Energy
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan [23000009]
- Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST)
- Nippon Sheet Glass Foundation for Materials Science and Engineering
Particulate solid solutions between BaTaO2N and BaZrO3, having a single-phase perovskite structure, were examined over the Zr/Ta range from 0 to 0.5 as photocatalysts for water splitting under visible light. With increasing BaZrO3 content (that is, Zr/Ta ratio), the band edge of BaTaO2N shifted from 660 to 620 nm, due primarily to the contribution from the larger band gap of BaZrO3 compared to BaTaO2N. These materials, with modification by the cocatalysts Pt and IrO2, were capable of reducing and oxidizing water into H-2 and O-2, respectively, under visible light (lambda > 420 nm) in the presence of methanol and silver nitrate as an electron donor and acceptor, respectively. When a small amount of BaZrO3 was introduced into BaTaO2N (Zr/Ta <= 0.05) using a suitably prepared oxide precursor, the highest activity was obtained for both water reduction and oxidation. On the other hand, when added in excess, BaZrO3 lowered the crystallinity of the solid solution, contributing directly to a decrease in photocatalytic activities, especially for water oxidation. The results of photoelectrochemical measurements indicated that the conduction band minimum and the valence band maximum of BaZrO3-BaTaO2N solid solution straddle the water-splitting potential. (C) 2012 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据