Crystalline Fe2O3/Fe2TiO5 heterojunction nanorods with efficient charge separation and hole injection as photoanode for solar water oxidation

被引：109

作者：

Bassi, Prince Saurabh ^{[1
]}

Antony, Rajini P. ^{[1
]}

Boix, Pablo P. ^{[2
]}

Fang, Yanan ^{[1
]}

Barber, James ^{[1
,3
]}

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, 50 Nanyang Dr,Res Techno Plaza,X Frontier Block, Singapore 637553, Singapore

[3] Univ London Imperial Coll Sci Technol & Med, Dept Life Sci, London SW7 2AZ, England

来源：

NANO ENERGY | 2016年 / 22卷

关键词：

Hematite; Pseudobrookite; Band alignment; Impedance spectroscopy; Water splitting; Photoelectrochemical Cell; HEMATITE; PHOTOELECTRODES; ACTIVATION;

D O I：

10.1016/j.nanoen.2016.02.013

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：

We have constructed a Fe2O3/Fe2TiO5 heterojunction based photoanode deposited on Fluorine Doped Tin Oxide (FTO) substrate by initially fabricating hematite (Fe2O3) nanorods and subsequently pseudobrookite (Fe2TiO5) nanoporous thin film on top of them. Comparatively lower annealing temperature of 650 degrees C (usually 750 degrees C or above) was used to avoid degradation of FTO. The crystalline Fe2O3/Fe2TiO5 heterojunction shows a considerable enhancement in photocurrent density ca. 1.4 mA/cm(2) and high surface charge separation efficiency of 85% at operating voltage of 1.23 V vs RHE as compared to its constituents. The crystalline heterojunction showed overall improvement in performance due to enhanced charge separation owing to the favorable band alignment with Fe2O3 nanorods and efficient injection of photogenerated holes through surface states into the electrolyte observed through Electrochemical Impedance Spectroscopy. (C) 2016 Published by Elsevier Ltd.

引用

页码：310 / 318

页数：9

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