Co3O4-Decorated Hematite Nanorods As an Effective Photoanode for Solar Water Oxidation

被引：137

作者：

Xi, Lifei ^{[1
]}

Tran, Phong D. ^{[2
]}

Chiam, Sing Yang ^{[3
]}

Bassi, Prince Saurabh ^{[1
]}

Mak, Wai Fatt ^{[1
]}

Mulmudi, Hemant Kumar ^{[2
]}

Batabyal, Sudip K. ^{[2
]}

Barber, James ^{[1
,2
,4
,5
]}

Loo, Joachim Say Chye ^{[1
]}

Wong, Lydia Helena ^{[1
]}

机构：

[1] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

[2] Nanyang Technol Univ, Energy Res Inst NTU, Singapore 637553, Singapore

[3] ASTAR, Inst Mat Res & Engn IMRE, Singapore 117602, Singapore

[4] Univ London Imperial Coll Sci Technol & Med, Div Mol Biosci, London SW7 2AZ, England

[5] Polytech Torino, Dept Mat Sci & Chem Engn, BioSolar Lab, I-10129 Turin, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 26期

关键词：

ALPHA-FE2O3; ELECTRODES; DOPED HEMATITE; THIN-FILMS; COMPOSITE; COBALT; ARRAYS; OXYGEN; CATALYSTS;

D O I：

10.1021/jp304285r

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：

In this Article, we report a strategy to perform in situ incorporation of oxygen evolution catalyst, Co3O4, during hydrothermal growth of Fe2O3 nanorod arrays. It was found that the highest photocurrent increase and onset potential shift was observed with 5% Co2+. The photocurrent density increases from 0.72 for the pristine Fe2O3 nanorod to 1.20 mA/cm(2) at 1.23 V versus RHE (i.e., 67% improvement) with 5% Co2+ added. Concomitant with this improvement was a shift in the onset potential by similar to 40 mV and improvements in incident-photon-to-current efficiencies and oxygen evolution. Hematite photoanodes with in situ deposition of Co3O4 nanoparticles showed better performance than those prepared by ex situ procedures because of high surface roughness, larger Co3O4/hematite interfacial area, and smaller Co3O4 particle size.

引用

页码：13884 / 13889

页数：6

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