Probing the Role of Atomic Defects in Photocatalytic Systems through Photoinduced Enhanced Raman Scattering
Source abstract
Abstract
Even in ultralow quantities, oxygen vacancies (VO) drastically impact key properties of metal oxide semiconductors, such as charge transport, surface adsorption, and reactivity, playing central roles in functional materials performance. Current methods used to investigate VO often rely on specialized instrumentation under far from ideal reaction conditions. Hence, the influence of VO generated in situ during catalytic processes has yet to be probed. In this work, we assess in situ extrinsic surface VO formation and lifetime under photocatalytic conditions which we compare to photocatalytic performance. We show for the first time that lifetimes of in situ generated atomic VO play more significant roles in catalysis than their concentration, with strong correlations between longer-lived VO and higher photocatalytic activity. Our results indicate that enhanced photocatalytic efficiency correlates with goldilocks VO concentrations, where VO densities must be just right to encourage carrier transport while avoiding charge carrier trapping.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Transition Metal Oxide Nanomaterials · Electronic and Structural Properties of Oxides · Copper-based nanomaterials and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, U.K.
Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
Fotoelectrocatálisis para Aplicaciones Medioambientales (FEAM), Departamento de Química, Universidad de Las Palmas de Gran Canaria (ULPGC), Edificio Polivalente I, Campus de Tafira, Las Palmas de Gran Canaria 35017, Spain
Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), CNRS UMR 7515, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
Chair in Hybrid Nanosystems, Faculty of Physics, Ludwig Maximilians Universität München, 80539 München, Germany
Funding
Engineering and Physical Sciences Research Council · IFP Energies Nouvelles · European Commission · Defence Science and Technology Laboratory · Deutsche Forschungsgemeinschaft · Bavarian program Solar Energies Go Hybrid · Development and Promotion of Science and Technology Talents Project · Center for NanoScience
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