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

Publikationsart Peer-reviewed
Publikationsform Originalbeitrag (peer-reviewed)
Publikationsjahr 2013
Autor/in Hu Yelin, Bora Debajeet K., Boudoire Florent, Häussler Florian, Gräetzel Michael, Constable Edwin C., Braun Artur
Projekt Fundamental Aspects of Photocatalysis and Photoelectrochemistry / Basic Research Instrumentation for Functional Characterization
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Originalbeitrag (peer-reviewed)

Zeitschrift Journal of Renewable and Sustainable Energy
Volume (Issue) 5(4)
Seite(n) 043109-1 - 043109-9
Status Publiziert
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.