Charge carrier trapping, recombination and transfer in hematite (α-Fe2O3) water splitting photoanodes
Top Cited Papers
Open Access
- 1 January 2013
- journal article
- Published by Royal Society of Chemistry (RSC) in Chemical Science
- Vol. 4 (7), 2724-2734
- https://doi.org/10.1039/c3sc50496d
Abstract
Hematite is currently considered one of the most promising materials for the conversion and storage of solar energy via the photoelectrolysis of water. Whilst there has been extensive research and much progress in the development of hematite structures with enhanced photoelectrochemical (PEC) activity, relatively limited information has been available until recently concerning the dynamics of photogenerated charge carriers in hematite and their impact upon the efficiency of water photoelectrolysis. In this perspective we present an overview of our recent studies of the dynamics of photoinduced charge carrier processes in hematite, derived primarily from transient absorption spectroscopy of nanostructured photoanodes. The relationship between PEC activity and transient measurements are discussed in terms of a phenomenological model which rationalizes the observations and in particular the impact of external potential bias on the relative rates of charge carrier trapping, recombination and interfacial transfer in hematite photoanodes for water oxidation.Keywords
This publication has 94 references indexed in Scilit:
- Highly efficient water splitting by a dual-absorber tandem cellNature Photonics, 2012
- Photoelectrochemical and Impedance Spectroscopic Investigation of Water Oxidation with “Co–Pi”-Coated Hematite ElectrodesJournal of the American Chemical Society, 2012
- Dynamics of photogenerated holes in surface modified α-Fe 2 O 3 photoanodes for solar water splittingProceedings of the National Academy of Sciences of the United States of America, 2012
- Nanostructured hematite: synthesis, characterization, charge carrier dynamics, and photoelectrochemical propertiesEnergy & Environmental Science, 2012
- Water Oxidation at Hematite Photoelectrodes: The Role of Surface StatesJournal of the American Chemical Society, 2012
- The Role of Cobalt Phosphate in Enhancing the Photocatalytic Activity of α-Fe2O3 toward Water OxidationJournal of the American Chemical Society, 2011
- Time-resolved spectroscopic behavior of Fe2O3 and ZnFe2O4 nanocrystalsThe Journal of Chemical Physics, 2004
- Iron oxide electrodes for photoelectrolysis of waterInternational Journal of Hydrogen Energy, 1983
- Photoactivity of doped αFe2O3 electrodesSolar Energy Materials, 1982
- Flatband Potentials and Donor Densities of Polycrystalline α-Fe[sub 2]O[sub 3] Determined from Mott-Schottky PlotsJournal of the Electrochemical Society, 1978