Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524
Qrcode

Article

J. Korean Phy. Soc. 2007; 51(1(1)): 27-31

Published online July 31, 2007     https://doi.org/10.3938/jkps.51.27

Copyright © The Korean Physical Society.

Structure of PbBi2Nb2O9 and Its Cr-Doped Layered Perovskite System and Their Photocatalytic Activities

S. J. HONG, P. H. BORSE, S. M. JI, J. S. JANG, J. S. LEE, E. D. JEONG, H. G. KIM and H. K. PAK

Abstract

In the search for efficient photocatalysts for water splitting under visible light, the effect of chromium doping in a (100) layered Aurivillius-phase perovskite material, PbBi$_2$Nb$_2$O$_9$, has been studied. The Cr-doped PbBi$_2$Nb$_2$O$_9$ showed three absorption edges: the main edge due to the oxide at 431 nm and shoulders due to the chromium ions at 470 nm and 600 nm, respectively. The Pt/Cr-doped PbBi$_2$Nb$_2$O$_9$ photocatalyst was more active than the undoped PbBi$_2$Nb$_2$O$_9$ for photocatalytic decomposition of water-methanol solution. This is attributed to Cr$^+$ ions having an important role in increasing QYs in the PbBi$_2$Nb$_2$O$_9$.

Keywords: Aurivillius-phase perovskite, Photocatalysts, Visible light, Quantum yield, Band-gap energy