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Thin-film TiO2 electrode surface characterization upon CO2 reduction processes

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Abstract

The effect of electrochemical reduction of CO2 on the structure and morphology of titanium(IV) oxide thin films was examined after a fixed-potential bulk electrolysis process. Films deposited on ITO (Indium-Tin Oxide) substrates were used as the working electrodes and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF4]) as solvent and as supporting electrolyte. Grazing incidence X-ray diffraction analysis performed before and after the electrolysis process indicated no microstructural changes of the anatase films. X-ray photoelectron spectroscopy revealed peaks associated with adsorbed carbonate ions at 288 eV and CO2 species at 293 eV, whereas Ti2p peaks displacements for CO2-saturated TiO2/ITO surfaces in [BMIm][BF4] revealed chemical bonding effects. Auger electron spectroscopy revealed a high carbon content on CO2-exposed films, and suggested a strong chemisorption of CO2 and CO32− species on the TiO2/ITO surface in [BMIm][BF4] solvent system. A significant decrease in carbon content after bulk electrolysis indicated that the CO2 electroreduction process is not controlled by either diffusion or by adsorption of CO2 on the TiO2/ITO electrode surface.

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Authors and Affiliations

  1. Laboratorio de Investigación del Vidrio, Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Apdo. Postal No. 24, Suc. Cd. Universitaria, 66450, San Nicolás de los Garza, N.L.

    Luisa F. Cueto & Eduardo M. Sánchez

  2. Centro de Ciencias de la Materia Condensada, Universidad Nacional Autónoma de México, México

    Gustavo A. Hirata

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  1. Luisa F. Cueto
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  2. Gustavo A. Hirata
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  3. Eduardo M. Sánchez
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Correspondence to Eduardo M. Sánchez.

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Cueto, L.F., Hirata, G.A. & Sánchez, E.M. Thin-film TiO2 electrode surface characterization upon CO2 reduction processes. J Sol-Gel Sci Technol 37, 105–109 (2006). https://doi.org/10.1007/s10971-006-6427-x

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