Yb-doped WO3 photocatalysts for water oxidation with visible light

被引：71

作者：

Liew, S. L. ^{[1
]}

Zhang, Z. ^{[1
]}

Goh, T. W. Glenn ^{[1
]}

Subramanian, G. S. ^{[1
]}

Seng, H. L. Debbie ^{[1
]}

Hor, T. S. Andy ^{[1
,2
]}

Luo, H. -K. ^{[1
]}

Chi, D. Z. ^{[1
]}

机构：

[1] ASTAR, Inst Mat Res & Engn, Singapore 117602, Singapore

[2] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2014年 / 39卷 / 09期

关键词：

Yb-doped WO3; Photocatalysts; Sputtering; Water oxidation; TUNGSTEN-OXIDE; FABRICATION; ELECTRODES; LATIO2N;

D O I：

10.1016/j.ijhydene.2013.12.204

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：

Yb-doped WO3 photocatalysts were prepared by co-sputtering WO3 and Yb, followed by annealing in air for water oxidation with visible light. All the obtained photocatalysts were monoclinic with sputtering power of Yb up to 10 W and displayed no optical absorption red shift. In photoelectrochemical (PEC) studies, the photocurrent densities were improved with up to 0.34 at.% Yb in WO3, with the highest photocurrent of 1.3 mA/cm(2) (1.2 V vs. Ag/AgCl) achieved with <0.1 at.% Yb. Electrochemical impedance spectroscopy (EIS) measurements showed that optimized Yb doping reduced charge transfer resistance and increased donor density of WO3 photocatalyst. The improvement in photocurrent density was attributed to enhanced conductive carrier path, increased oxygen vacancies and 4f(13) orbital configuration due to Yb3+ substitution of W6+. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：4291 / 4298

页数：8

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