Photocatalytic activity of Ca₃Ti₂O₇ layered-perovskite doped with Rh under visible light irradiation

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• 作者：Yoshihiro Okazaki ; Takahiro Mishima ; Shunsuke Nishimoto ; Motohide Matsuda ; Michihiro Miyake
• 关键词：Photochemical technology ; Catalysts ; Perovskites ; Visible light response ; Rh-doping
• 刊名：Materials Letters
• 出版年：2008
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 July 2008
• 卷：62
• 期：19
• 页码：3337-3340
• 文件大小：352 K

摘要

The photocatalytic activities of layered-perovskite Ca₃Ti₂O₇ doped with Rh were investigated with visible light irradiation. Although the Rh-doped Ca₃Ti₂O₇ as prepared showed low activity after an induction period, the photocatalytic activity was highly enhanced by treating the samples in reducing atmosphere without the need for an induction period. The rate of H₂ evolution from an aqueous methanol solution by 3 mol%Rh-doped Ca₃Ti₂O₇ after the reduction treatment was about 5 times higher than that before the reduction. The layered photocatalytic compounds, Ca₃Ti_{2 − x}Rh_xO₇, showed higher stability in air than CaTi_{1 − x}Rh_xO₃, which consists of a simple perovskite structure.