Synergetic effect of copper species as cocatalyst on LaFeO3 for enhanced visible-light photocatalytic hydrogen evolution

被引：43

作者：

Li, Juanjuan ^{[1
,2
]}

Pan, Xinwei ^{[1
]}

Xu, Yingrui ^{[1
]}

Jia, Lishan ^{[1
]}

Yi, Xiaodong ^{[1
]}

Fang, Weiping ^{[1
]}

机构：

[1] Xiamen Univ, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China

[2] Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Environm & Hlth, Xiamen 361021, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2015年 / 40卷 / 40期

基金：

中国国家自然科学基金;

关键词：

Copper species; LaFeO3; catalyst; Reduction treatment; Hydrogen production; Visible-light; WATER; TIO2; PEROVSKITES; REDUCTION; NANOCOMPOSITE; GENERATION; MORPHOLOGY; CATALYSTS; LA2CUO4; ROLES;

D O I：

10.1016/j.ijhydene.2015.07.166

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

LaFeO3 has been reported to have excellent optoelectronic properties and a narrow bandgap, which make it a promising candidate for photocatalytic reactions. In this work, to further improve the photocatalytic water-splitting performance by enhancing the separation of photo-excited carriers and providing active sites for H-2 production, cocatalysts (copper species) supported on the perovskite-type oxide LaFeO3 was obtained by a citrate complexation and reduction treatment. Copper ions in the perovskite lattice are easily reduced and LaFeO3 possesses good stability in reducing atmospheres; thus, a series of stable LaFeO3 with a controllable copper species were synthesized and characterized by XRD, DRS, XPS and PL. The results showed that copper species (Cu-0 and Cu+) supported on the LaFeO3 surface brought about a significant enhancement of photocatalytic activity. The LaFe0.8 + LaCu0.2 treated at 300 degrees C exhibited the highest photocatalytic activity, with a H-2 evolution rate of 343 mu mol g(-1) h(-1), which was attributed to the fact that a proper Cu-0 to Cu+ ratio (Cu-0/Cu+ = 1.34) could serve as a cocatalyst for photocatalytic hydrogen evolution, providing accelerated electron hole separation and proton-reduction sites. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：13918 / 13925

页数：8

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