Issue 3, 2011
From the journal:

Energy & Environmental Science

Oriented Ti doped hematite thin film as active photoanodes synthesized by facile APCVD

Peng Zhang,ab   Alan Kleiman-Shwarsctein,a   Yong-Sheng Hu,ac   Jarrod Lefton,a   Sudhanshu Sharma,a   Arnold J. Formand  and  Eric McFarland*a  

* Corresponding authors

a Department of Chemical Engineering, University of California at Santa Barbara, Santa Barbara, CA, USA
E-mail: mcfar@engineering.ucsb.edu

b School of Materials Science and Engineering, State Key Laboratory for Metallic Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai, China
E-mail: pengzhang2010@sjtu.edu.cn

c Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
E-mail: yshu@aphy.iphy.ac.cn

d Department of Chemistry, University of California at Santa Barbara, Santa Barbara, CA, USA
E-mail: arnold.j.forman@gmail.com

Abstract

To improve the optoelectronic properties of iron oxide as a photoelectrode, hematite (α-Fe2O3) thin films were doped with titanium using atmospheric pressure chemical vapor deposition (APCVD) for synthesis. The films were prepared by pyrolysis of Fe(CO)5 and TiCl4 precursors on fluorine-doped tin oxide (FTO) substrates and found to have a polycrystalline morphology with faceted particulates ∼20 to 50 nm in size with a preferred crystallographic growth along the [110] direction. The performance of the photoanodes was measured as a function of titanium concentration. A maximum efficiency was observed at ∼0.8 atom% Ti in hematite. The Incident Photon-to-current Conversion Efficiency (IPCE) to hydrogen was measured in alkaline electrolyte. Under an applied bias of 0.6 V vs.Ag/AgCl at 400 nm the IPCE for water splitting in alkaline solution was found to be 27.2%, the highest efficiency reported for Ti doped hematite photoanodes. The IPCEs of the photoanode thin films at lower applied bias were further increased by calcination at 500 °C and by use of glucose as an anolyte.

Graphical abstract: Oriented Ti doped hematite thin film as active photoanodes synthesized by facile APCVD

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Article information

DOI
https://doi.org/10.1039/C0EE00656D
Article type
Paper
Submitted
11 Nov 2010
Accepted
20 Dec 2010
First published
27 Jan 2011

Energy Environ. Sci., 2011,4, 1020-1028

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Oriented Ti doped hematite thin film as active photoanodes synthesized by facile APCVD

P. Zhang, A. Kleiman-Shwarsctein, Y. Hu, J. Lefton, S. Sharma, A. J. Forman and E. McFarland, Energy Environ. Sci., 2011, 4, 1020 DOI: 10.1039/C0EE00656D

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