Enhanced photocatalytic hydrogen production activity of chromium doped lead niobate under visible-light irradiation

Authors: Yuchao Hu, Jinwen Shi, Liejin Guo

Abstract:
A series of Cr-doped layered HPb₂Nb₃O₁₀ was prepared by a solid-state reaction followed by H⁺ exchange for the first time. The effects of doping on the structural and optical properties were comprehensively characterized by powder X-ray diffraction, UV–vis absorption spectroscopy, X-ray photoelectron spectroscopy, photoluminescence (PL) spectroscopy and scanning electron microscopy. Crystal structure was slightly adjusted by Cr³⁺ substituting for Nb^5+. Absorption edge of the photocatalyst gradually red shifted with the increase of Cr³⁺, indicating the narrowing of band gap. Photocatalytic hydrogen evolution activity of Cr-doped HPb₂Nb₃O₁₀, under full-arc or visible-light irradiation, gradually increased with Cr content up to 0.05 and thereafter decreased with higher Cr content. The activity of Cr(0.05)-doped HPb₂Nb₃O₁₀ was twice as high as that of undoped HPb₂Nb₃O₁₀. Narrower band gap and higher separation efficiency of photoinduced carriers in the bulk are the key factors that lead to its superior photocatalytic performance.

Keywords:
Photocatalysis
Hydrogen
Chromium
Layered niobate

Published in: Applied catalysis A: General   (Volume 468, Pages 1-474, 5 November 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Enhanced photocatalytic hydrogen production activity of chromium doped lead niobate under visible-light irradiation

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