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Assessing the Suitability of Iron Tungstate (Fe2WO6) as a Photoelectrode Material for Water Oxidation
journal contribution
posted on 2016-12-15, 00:00 authored by Fatwa F. Abdi, Abdelkrim Chemseddine, Sean P. Berglund, Roel van de KrolOrthorhombic
iron tungstate (Fe2WO6), with
a reported bandgap of ∼1.5–1.7 eV, is a potentially
attractive material as the top absorber in a tandem photoelectrochemical
(PEC) device. Few studies have been carried out on this material,
and most of the important optical, electronic, and PEC properties
are not yet known. We fabricated thin film Fe2WO6 photoanodes by spray pyrolysis and identified the performance limitations
for PEC water oxidation. Poor charge separation is found to severely
limit the photocurrent, which is caused by a large mismatch between
the light penetration depth (∼300 nm) and carrier diffusion
length (<10 nm) of the material. In addition, the conduction band
of Fe2WO6 lies 0.65 V positive of the reversible
hydrogen electrode potential, which means that a large external bias
potential is required for water oxidation. On the basis of these observations,
we critically discuss the suitability of Fe2WO6 as a novel photoelectrode material for photoelectrochemical and
photocatalytic applications.
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Water Oxidation Orthorhombic iron tungstatespray pyrolysiswater oxidationconduction bandnovel photoelectrode materialPoor charge separationtandem photoelectrochemicalPEC propertieshydrogen electrodephotocatalytic applicationsPEC water oxidationIron Tungstatefilm Fe 2 WO 6 photoanodes0.65 VFew studiesnmPhotoelectrode MaterialFe 2 WO 6performance limitations
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