Improving the Photoelectrochemical Performance of Hematite by Employing a High Surface Area Scaffold and Engineering Solid-Solid Interfaces
Herein, a high surface area electrode (HSE) consisting of indium tin oxide (ITO) as a scaffold and ultrathin Ti‐doped hematite (α‐Fe2O3) as the absorber material is developed. The HSE exhibits sixfold improvement in photoactivity over an analogous photoelectrode with a flat morphology. Interfacial r...
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Published in | Advanced materials interfaces Vol. 3; no. 7; pp. np - n/a |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
Blackwell Publishing Ltd
01.04.2016
John Wiley & Sons, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | Herein, a high surface area electrode (HSE) consisting of indium tin oxide (ITO) as a scaffold and ultrathin Ti‐doped hematite (α‐Fe2O3) as the absorber material is developed. The HSE exhibits sixfold improvement in photoactivity over an analogous photoelectrode with a flat morphology. Interfacial recombination due to dopant impurities and shunting resulting from a high pinhole density in the hematite layer limit the device performance. These limitations are mitigated by introducing a tin oxide barrier layer, which reduces recombination at the solid–solid interface and mitigates shunting. Employing the HSE with an appropriate barrier layer improves charge separation efficiency and catalytic activity compared to conventional planar devices. This strategy can potentially be extended to other light absorber materials whose performance is affected by charge transport limitations.
High surface area electrodes (HSE) consisting of high surface area indium tin oxide (ITO) scaffolds coated with Ti‐doped hematite (α‐Fe2O3) as the absorber material are developed. The addition of a tin oxide barrier layer on the HSE device mitigates solid–solid interfacial recombination and shunting, yielding a sixfold improvement in photocurrent density compared to conventional planar devices. |
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Bibliography: | ark:/67375/WNG-8LQB90M8-N Assistant Secretary for Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office, of the U. S. Department of Energy - No. DE-AC02-05CH11231 ArticleID:ADMI201500626 istex:9F94AF363F01AF7D47FCF6FADA194E4AB9C90572 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2196-7350 2196-7350 |
DOI: | 10.1002/admi.201500626 |