Photocatalytic hydrogen generation through water splitting on nano-crystalline LaFeO3 perovskite
Photocatalytic hydrogen generation through water splitting on nano-crystalline LaFeO3 perovskite
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DOI：
10.1016/j.ijhydene.2012.01.120
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发表时间：
2012-07-01
影响因子：
7.2
通讯作者：
Labhsetwar, Nitin K.
中科院分区：
文献类型：
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作者：
Tijare, Saumitra N.;Joshi, Meenal V.;Labhsetwar, Nitin K.
采用溶胶-凝胶法合成了LaFeO_3组成的可见光活性ABO(3)型光催化剂。采用X射线衍射仪、比表面积分析、粒度分析、扫描电子显微镜、紫外-可见漫反射光谱、光致发光光谱等手段对催化剂进行了表征。LaFeO3光催化剂的光学带隙为2.07 eV，吸收光谱主要位于可见光区。光催化剂LaFeO_3的比表面积为9.5m(2)/g，微晶尺寸为38.8 nm。以可见光为光源，乙醇为牺牲供体，H_2PtCl6的铂溶液为助催化剂，通过改变反应条件，考察了LaFeO_3在牺牲供体辅助光催化裂水反应中的光催化活性。在优化的条件下，使用1 mg剂量的光催化剂，反应时间为4h，光照为400W，光催化析氢速率为3315 mU·mol·g(1)h(-2)。版权所有(C)2012，氢能源出版物，LLC。爱思唯尔有限公司出版。保留所有权利。
Visible light active ABO(3) type photocatalyst with LaFeO3 composition was synthesized by sol-gel method. The photocatalyst was characterized by different techniques such as X-ray diffraction, BET surface area analysis, particle size analysis, scanning electron microscopy, UV-visible diffuse reflectance spectroscopy (UV-Visible DRS), and photoluminescence spectroscopy. LaFeO3 photocatalyst exhibited an optical band gap of 2.07 eV with the absorption spectrum predominantly in visible region of the spectrum. The BET surface area of photocatalyst LaFeO3 was observed as 9.5 m(2)/g, with the crystallite size of 38.8 nm as calculated by the Debye-Scherer equation. The photocatalytic activity of LaFeO3 was investigated for hydrogen generation through sacrificial donor assisted photocatalytic water splitting reaction by varying conditions in feasible parametric changes using visible light source, ethanol as a sacrificial donor and Pt solution of H2PtCl6 as a co-catalyst. The rate of photocatalytic hydrogen evolution was observed to be 3315 mu mol g (1) h(-2) under optimized conditions and using 1 mg dose of photocatalyst with reaction time of 4 h and illumination of 400 W. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.