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Issue 8, 2016
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Improving the stability and selectivity for the oxygen-evolution reaction on semiconducting WO3 photoelectrodes with a solid-state FeOOH catalyst

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Abstract

WO3 electrodes were synthesized via a sol–gel route followed by the photoelectrochemical deposition of a solid state FeOOH oxygen-evolution catalyst (OEC) to observe its effects on electrode stability and selectivity towards the oxygen evolution reaction (OER). WO3 photoanodes have been reported to degrade in aqueous solutions with pH > 3 due to the material's Arrhenius acidity and the potential formation of reactive peroxide intermediates on the WO3 surface during the course of photoelectrochemical water oxidation. The stability during photoelectrochemical OER of WO3 and WO3–FeOOH photoanodes was measured at 1.23 V vs. RHE at pH 4 and 7 in phosphate-buffered solutions. Additionally, the faradaic efficiencies of the electrodes for OER were measured at pH 4. WO3–FeOOH electrodes demonstrate a 95.9 ± 1.6% faradaic efficiency for OER in pH 4 potassium phosphate buffer at current densities of ∼0.75 mA cm−2 under 200 mW cm−2 AM1.5G illumination and an applied bias of 1.43 V vs. RHE. These experiments demonstrate that adding an FeOOH co-catalyst dramatically improves the stability of the electrodes, selectivity, and rate of OER versus that observed on WO3 films.

Graphical abstract: Improving the stability and selectivity for the oxygen-evolution reaction on semiconducting WO3 photoelectrodes with a solid-state FeOOH catalyst

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Article information


Submitted
26 Jun 2015
Accepted
25 Aug 2015
First published
28 Aug 2015

J. Mater. Chem. A, 2016,4, 2960-2968
Article type
Paper
Author version available

Improving the stability and selectivity for the oxygen-evolution reaction on semiconducting WO3 photoelectrodes with a solid-state FeOOH catalyst

C. R. Lhermitte, J. Garret Verwer and B. M. Bartlett, J. Mater. Chem. A, 2016, 4, 2960
DOI: 10.1039/C5TA04747A

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