Visible Light-Driven α-Fe2O3 Nanorod/Graphene/BiV1-xMoxO4 Core/Shell Heterojunction Array for Efficient Photoelectrochemical Water Splitting

被引：462

作者：

Hou, Yang ^{[1
]}

Zuo, Fan ^{[1
]}

Dagg, Alex ^{[1
]}

Feng, Pingyun ^{[1
]}

机构：

[1] Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA

来源：

NANO LETTERS | 2012年 / 12卷 / 12期

基金：

美国国家科学基金会;

关键词：

Fe2O3 nanorod arrays; graphene; Biv(1-x)Mo(x)O(4); core/shell; heterojunction; photoelectrochemical water splitting; THIN-FILMS; HYDROGEN-PRODUCTION; NANOTUBE ARRAYS; GRAPHENE OXIDE; COMPOSITE; BIVO4; NANOSTRUCTURES; DEGRADATION; PERFORMANCE; ELECTRODES;

D O I：

10.1021/nl303961c

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

We report the design, synthesis, and characterization of a novel heterojunction array of alpha-Fe2O3/graphene/BiV1-xMoxO4 core/shell nanorod for photoelectrochemical water splitting. The heterojunction array was prepared by hydrothermal deposition of alpha-Fe2O3 nanorods onto Ti substrate, with subsequent coating of graphene interlayer and BiV1-xMoxO4 shell by photocatalytic reduction and a spin-coating approach, respectively. The heterojunction yielded a pronounced photocurrent density of similar to 1.97 mA/cm(2) at 1.0 V vs Ag/AgCl and a high photoconversion efficiency of similar to 0.53% at -0.04 V vs Ag/AgCl under the irradiation of a Xe lamp. The improved photoelectrochemical properties benefited from (1) the enhanced light absorption due to behavior of the "window effect" between the alpha-Fe2O3 cores and BiV1-xMoxO4 shells, and (2) the improved separation of photogenerated carriers at the alpha-Fe2O3 nanorod/graphene/BiV1-xMoO4 interfaces. Our results demonstrate the advantages of the novel graphene-mediated core/shell heterojunction array and provide a valuable insight for the further development of such materials.

引用

页码：6464 / 6473

页数：10

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