Analysis of charge trapping and long lived hole generation in SrTiO₃ photoanodes
File(s)
Published version
Author(s)
Wilson, Anna A
Shalvey, Thomas P
Kafizas, Andreas
Mumtaz, Asim
Durrant, James R
Type
Journal Article
Abstract
Charge carrier dynamics studies of SrTiO3 under applied bias offer the opportunity to gain unique insights into what underpins its state-of-the-art photocatalytic water splitting activity. Herein, time resolved spectroscopic measurements are employed, to investigate the impact of applied bias on the transient and steady state charge carrier dynamics of SrTiO3 across μs–s timescales, and simultaneously measure charge extraction kinetics. A high density of Ti3+ defect states in SrTiO3 photoanodes are identified and associated with prevalent electron trapping into deep states, which is in competition with electron extraction and limits the photocurrent. Despite the high density of trapped electrons, an intrinsically long lifetime for photogenerated holes in SrTiO3 photoanodes is observed using transient absorption spectroscopy, even in the absence of applied bias. This is important for overcoming the slow kinetics and hole accumulation associated with the water oxidation reaction, and for enabling good performance in photocatalytic systems where bias cannot be applied.
Date Issued
2023-10-21
Date Acceptance
2023-09-01
Citation
Sustainable Energy & Fuels, 2023, 7 (20), pp.5066-5075
ISSN
2398-4902
Publisher
Royal Society of Chemistry
Start Page
5066
End Page
5075
Journal / Book Title
Sustainable Energy & Fuels
Volume
7
Issue
20
Copyright Statement
This journal is © The Royal Society of Chemistry 2023. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
License URL
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:001065800900001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
Subjects
ABSORPTION-SPECTROSCOPY
BIVO4
Chemistry
Chemistry, Physical
COCATALYST
EFFICIENT
Energy & Fuels
Materials Science
Materials Science, Multidisciplinary
MORPHOLOGY
PHOTOCATALYTIC WATER OXIDATION
Physical Sciences
RATE LAW ANALYSIS
RECOMBINATION
Science & Technology
SINGLE-CRYSTALLINE
SURFACE
Technology
Publication Status
Published
Date Publish Online
2023-09-06