期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 183, 期 1-2, 页码 176-181出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2006.03.014
关键词
visible light active photocatalyst; bandgap engineering; cation substitution; perovskite; chemical bonding nature
We have investigated the effects of A- and B-site cation substitution on the physicochemical properties of perovskite-structured A(In1/3Nb1/3B1/3)O-3 (A=Sr, Ba; B=Sn, Pb) photocatalysts. X-ray diffraction, X-ray absorption and diffuse UV-vis spectroscopic analyses reveal that tetravalent Pb-IV or Sn-IV ions can be successfully incorporated into the octahedral B-site of the perovskite lattice, leading to a narrowing of bandgap energy (E-g). The substitution of such electronegative cations gives rise to the enhancement of photocatalytic activity to effectively decompose organic molecules. Interestingly, alkaline earth metal ions in the dodecahedral A-site with ionic bonding environment also affect significantly the band structure and photoefficiency of the perovskite compounds; a larger cation is beneficial for creating visible light driven photocatalytic activity through a decrease of E-g. This observation could be understood in terms of the weakening of transition metal-oxygen bond upon the expansion of unit cell. The present relationship between the chemical bonding nature of substituent cation and the band structure provides an efficient tool for designing and developing new efficient visible light active photocatalysts. (c) 2006 Elsevier B.V. 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