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A dip coating process for large area silicon-doped high performance hematite photoanodes

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2013
Author Hu Yelin, Bora Debajeet K., Boudoire Florent, Häussler Florian, Gräetzel Michael, Constable Edwin C., Braun Artur,
Project Fundamental Aspects of Photocatalysis and Photoelectrochemistry / Basic Research Instrumentation for Functional Characterization
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Original article (peer-reviewed)

Journal Journal of Renewable and Sustainable Energy
Volume (Issue) 5(4)
Page(s) 043109-1 - 043109-9
Title of proceedings Journal of Renewable and Sustainable Energy
DOI 10.1063/1.4812831

Abstract

A facile and low-cost dip-coating process for the deposition of silicon doped hematite films (Si:α-Fe2O3) for hydrogen production by solar water splitting in photo-electrochemical cells (PEC) is presented. The precursors include iron nitrate, oleic acid, tetraethyl orthosilicate (TEOS) and tetrahydrofuran as dispersion agent. Sequential dip coating on transparent conducting oxides glass substrates with heat treatment steps at 500 °C and 760 °C yields mesoporous Si:α-Fe 2O3 with a roughness factor of 17 and photocurrent densities >1 mA/cm2 at 1.23 V vs. reversible hydrogen electrode with SiOx underlayer and surface modification. A PEC demonstrator with 80 cm2 active area in 1 M potassium hydroxide yields a photocurrent of 35 mA at 1.5 AM irradiation with the corresponding hydrogen evolution at a Pt wire counter electrode. © 2013 AIP Publishing LLC.
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