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PrFeO 3 photocathodes prepared through spray pyrolysis

Freeman, Emma, Kumar, Santosh, Thomas, Sophie R., Pickering, Hayley, Fermin, David J. and Eslava, Salvador 2020. PrFeO 3 photocathodes prepared through spray pyrolysis. ChemElectroChem 7 (6) , pp. 1365-1372. 10.1002/celc.201902005

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Abstract

Perovskite oxides are receiving wide interest for photocatalytic and photoelectrochemical devices, owing to their suitable band gaps for solar light absorption and stability in aqueous applications. Herein, we assess the activity of PrFeO3 photocathodes prepared by using spray pyrolysis and calcination temperatures between 500 and 700 °C. Scanning electron microscopy shows corrugated films of high surface coverage on the conductive glass substrate. The electrochemically active surface area shows slight decreases with temperature increases from 500 to 600 and 700 °C. However, transient photocurrent responses and impedance spectroscopy data showed that films calcined at higher temperatures reduced the probabilities of recombination due to trap states, resulting in faster rates of charge extraction. In this trade‐off, a calcination temperature of 600 °C provided a maximum photocurrent of ‐130±4 μA cm−2 at +0.43 VRHE under simulated sunlight, with an incident photon‐to‐current conversion efficiency of 6.6 % at +0.61 VRHE and 350 nm and an onset potential of +1.4 VRHE for cathodic photocurrent.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Wiley
ISSN: 2196-0216
Date of First Compliant Deposit: 16 March 2020
Date of Acceptance: 10 February 2020
Last Modified: 17 Oct 2020 01:26
URI: http://orca.cf.ac.uk/id/eprint/130436

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