Bi₂Fe₄O₉ thin films as novel visible-light-active photoanodes for solar water splitting

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Title: Bi₂Fe₄O₉ thin films as novel visible-light-active photoanodes for solar water splitting
Authors: Wang, Y
Daboczi, M
Mesa, CA
Ratnasingham, SR
Kim, JS
Durrant, JR
Dunn, S
Yan, H
Briscoe, J
Item Type: Journal Article
Abstract: We report the chemical solution deposition (CSD) of a phase-pure Bi2Fe4O9 thin film for use as a photoanode in photoelectrochemical (PEC) water splitting. The energy levels of Bi2Fe4O9 films have been measured and n-type characteristics have been confirmed. With band gaps determined as 2.05 eV (indirect) and 2.80 eV (direct) and valence and conduction bands straddling the water oxidation and reduction potentials, this material is highly promising as a photocatalyst for solar water splitting. The photocurrent of a planar photoanode reached 0.1 mA cm−2 at 1.23 VNHE under AM1.5G illumination. The addition of H2O2 as a hole scavenger increased the photocurrent to 0.25 mA cm−2, indicating hole injection is one limiting factor to the performance. The performance was enhanced by nearly 5-fold when the Bi2Fe4O9 photoanode is coupled to a Co–Pi surface co-catalyst. The photoanode also shows excellent stability with no change in photocurrent over three hours of continuous illumination. These results indicate that this material represents a promising addition to the growing selection of low-cost, stable photocatalysts for use in solar water splitting.
Issue Date: 30-Apr-2019
Date of Acceptance: 28-Mar-2019
ISSN: 2050-7496
Publisher: Royal Society of Chemistry
Start Page: 9537
End Page: 9541
Journal / Book Title: Journal of Materials Chemistry A
Volume: 7
Issue: 16
Is Replaced By: 10044/1/68308
Copyright Statement: © The Royal Society of Chemistry 2019.
Sponsor/Funder: Engineering and Physical Sciences Research Council
KP Technology
Funder's Grant Number: EP/L016702/1
Publication Status: Published
Embargo Date: 2020-04-05
Online Publication Date: 2019-04-05
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences

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