1. Investigating Charge Transfer in Functionalized Mesoporous EISA–SnO2 Films
- Author
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François Lambert, Benoît Limoges, Wael Hamd, Cyrille Costentin, Véronique Balland, Christel Laberty-Robert, Laboratoire d'Electrochimie Moléculaire (LEM (UMR_7591)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Matériaux Hybrides et Nanomatériaux (MHN), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS Paris), Université Paris Diderot - Paris 7 (UPD7)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL), and École normale supérieure - Paris (ENS-PSL)
- Subjects
Flavin mononucleotide ,[CHIM.MATE]Chemical Sciences/Material chemistry ,02 engineering and technology ,Chromophore ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,Redox ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,Electron transfer ,General Energy ,chemistry ,Electrode ,Physical and Theoretical Chemistry ,Thin film ,Cyclic voltammetry ,0210 nano-technology ,Mesoporous material - Abstract
International audience; Semiconductive transparent thin films of periodically organized nanostructured SnO2 were prepared on flat conductive ITO substrates by evaporation-induced self-assembly (EISA) under different dip-coating regimes and then functionalized by two redox-active chromophores, i.e., the flavin mononucleotide (FMN) able to reversibly exchange 2 e– and 2 H+ and the [OsII(bpy)2(4,4′-CH2PO3H2-bpy)]2+ complex (OsP) involving a fast and reversible one-electron transfer. The redox behavior of these two chemisorbed chromophores was investigated by cyclic voltammetry and cyclic voltabsorptometry. On account of the distinct formal potential of the two redox chromophores relative to the position of the lower conduction band edge of SnO2, the heterogeneous electron transfer was observed to be either reversible (FMN) or irreversible (OsP). In the case of the OsP-functionalized SnO2 electrode, quantitative analysis of the cyclic voltabsorptograms was achieved within the framework of our previously proposed kinetic model of charge transfer/transport in mesoporous semiconductive films (Renault et al. Phys. Chem. Chem. Phys. 2015, 17, 10592), allowing for direct comparison between EISA–TiO2 and EISA–SnO2 electrodes. It is notably shown that the interfacial electron transfer between the adsorbed redox chromophore and the SnO2 interface is the rate-determining process under our experimental conditions. It is additionally demonstrated that the electrons trapped in the low-energy surface states of EISA–SnO2 can directly participate in the interfacial electron transfer, a behavior that strongly contrasts that which we had previously found at EISA–TiO2 electrodes (i.e., wherein only electrons from the conduction band were involved in the interfacial electron transfer).
- Published
- 2017