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WO3/BiVO4: impact of charge separation at the timescale of water oxidation
dc.contributor.author | Selim, Shababa | |
dc.contributor.author | Francàs Forcada, Laia | |
dc.contributor.author | García-Tecedor, Miguel | |
dc.contributor.author | Corby, Sacha | |
dc.contributor.author | Blackman, Chris | |
dc.contributor.author | Giménez Juliá, Sixto | |
dc.contributor.author | Durrant, James | |
dc.contributor.author | Kafizas, Andreas | |
dc.date.accessioned | 2019-11-18T11:19:17Z | |
dc.date.available | 2019-11-18T11:19:17Z | |
dc.date.issued | 2019-01-16 | |
dc.identifier.citation | SELIM, Shababa, et al. WO 3/BiVO 4: impact of charge separation at the timescale of water oxidation. Chemical science, 2019, vol. 10, no 9, p. 2643-2652 | ca_CA |
dc.identifier.issn | 2041-6520 | |
dc.identifier.issn | 2041-6539 | |
dc.identifier.uri | http://hdl.handle.net/10234/185012 | |
dc.description.abstract | The four hole oxidation of water has long been considered the kinetic bottleneck for overall solar-driven water splitting, and thus requires the formation of long-lived photogenerated holes to overcome this kinetic barrier. However, photogenerated charges are prone to recombination unless they can be spatially separated. This can be achieved by coupling materials with staggered conduction and valence band positions, providing a thermodynamic driving force for charge separation. This has most aptly been demonstrated in the WO3/BiVO4 junction, in which quantum efficiencies for the water oxidation reaction can approach near unity. However, the charge carrier dynamics in this system remain elusive over timescales relevant to water oxidation (μs–s). In this work, the effect of charge separation on carrier lifetime, and the voltage dependence of this process, is probed using transient absorption spectroscopy and transient photocurrent measurements, revealing sub-μs electron transfer from BiVO4 to WO3. The interface formed between BiVO4 and WO3 is shown to overcome the “dead-layer effect” encountered in BiVO4 alone. Moreover, our study sheds light on the role of the WO3/BiVO4 junction in enhancing the efficiency of the water oxidation reaction, where charge separation across the WO3/BiVO4 junction improves both the yield and lifetime of holes present in the BiVO4 layer over timescales relevant to water oxidation. | ca_CA |
dc.format.extent | 10 p. | ca_CA |
dc.format.mimetype | application/pdf | ca_CA |
dc.language.iso | eng | ca_CA |
dc.publisher | Royal Society of Chemistry | ca_CA |
dc.relation.isPartOf | Chemical science, 2019, vol. 10, no 9 | ca_CA |
dc.rights | Atribución 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-sa/4.0/ | * |
dc.subject | rate law analysis | ca_CA |
dc.subject | photogenerated holes | ca_CA |
dc.subject | carrier dynamics | ca_CA |
dc.subject | BiVO4 photoanodes | ca_CA |
dc.subject | absorption-spectroscopy | ca_CA |
dc.subject | recombination | ca_CA |
dc.subject | surface | ca_CA |
dc.subject | TiO2 | ca_CA |
dc.subject | photosynthesis | ca_CA |
dc.subject | electrodes | ca_CA |
dc.title | WO3/BiVO4: impact of charge separation at the timescale of water oxidation | ca_CA |
dc.type | info:eu-repo/semantics/article | ca_CA |
dc.identifier.doi | https://doi.org/10.1039/C8SC04679D | |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | ca_CA |
dc.relation.publisherVersion | https://pubs.rsc.org/en/content/articlehtml/2019/sc/c8sc04679d | ca_CA |
dc.contributor.funder | A. K. thanks Imperial College for a Junior Research Fellowship, the EPSRC for a Capital Award Emphasising Support for Early Career Researchers and the Royal Society for an Equipment Grant (RSG\R1\180434). J. R. D. acknowledges financial support from the European Research Council (project Intersolar 291482). L. F. thanks the EU for a Marie Curie Fellowship (658270). S. C. thanks Imperial College London for a Schrodinger Scholarship. S. S. thanks EPSRC for a DTP studentship. S. G. acknowledges financial support from Ministerio de Ciencia, Innovacion y Universidades of Spain (project ENE2017-85087-C3-1-R) | ca_CA |
dc.type.version | info:eu-repo/semantics/publishedVersion | ca_CA |
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