Anodized TiO 2 Nanotubes Sensitized with Selenium Doped CdS Nanoparticles for Solar Water Splitting

Julián Alfaro Chacón, Andrea Cerdán-Pasarán (), Isaac Zarazúa, Lourdes Ramos-Galicia, J. A. Hernández-Magallanes, K. C. Sanal, Shadai Lugo Loredo and Juan Manuel Hernández-López
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Julián Alfaro Chacón: Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Av. Universidad, Cd. Universitaria, San Nicolás de los Garza 66455, Nuevo León, Mexico
Andrea Cerdán-Pasarán: Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Av. Universidad, Cd. Universitaria, San Nicolás de los Garza 66455, Nuevo León, Mexico
Isaac Zarazúa: Centro Universitario de los Lagos, Universidad de Guadalajara, Lagos de Moreno 47460, Jalisco, Mexico
Lourdes Ramos-Galicia: Centro de Investigación en Materiales Avanzados S.C., Unidad Monterrey, Parque de Investigación e Innovación Tecnológica, Av. Alianza Norte 202, Apodaca 66600, Nuevo León, Mexico
J. A. Hernández-Magallanes: Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Av. Universidad, Cd. Universitaria, San Nicolás de los Garza 66455, Nuevo León, Mexico
K. C. Sanal: Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Av. Universidad, Cd. Universitaria, San Nicolás de los Garza 66455, Nuevo León, Mexico
Shadai Lugo Loredo: Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Av. Universidad, Cd. Universitaria, San Nicolás de los Garza 66455, Nuevo León, Mexico
Juan Manuel Hernández-López: Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Av. Universidad, Cd. Universitaria, San Nicolás de los Garza 66455, Nuevo León, Mexico

Energies, 2024, vol. 17, issue 7, 1-15

Abstract: In this research, TiO 2 nanotubes (NTs) were produced by electrochemical anodization of a Ti substrate where different NH 4 F wt.% in the electrolyte was added. NTs with diameter of 65–90 nm and 3.3–4.9 µm length were obtained and sensitized with binary cadmium chalcogenides nanoparticles, CdS and CdSe, by successive ionic layer adsorption and reaction method (SILAR). Additionally, both anions S and Se were deposited onto Cd, labeled as CdSSe and CdSeS, to evaluate the effect of the deposition order of the anion from the precursor solution to form cadmium chalcogenides. The structural, optical, and electrochemical performance were analyzed through the SEM, XRD, XPS, UV-VIS, lineal voltammetry and chronoamperometry characterizations. The increase of NH 4 F wt.% from 1.5% to 4.5% produced a decrement of the diameter and length attributed to the fluoride ions concentration causing solubility of the NTs. XRD confirmed the TiO 2 anatase and hexagonal CdS structures. From the EDS and XPS results, the presence of small amount of Se in the sensitized samples demonstrated the doping effect of Se instead of forming ternary semiconductor. With the sensitization of the TiO 2 NTs with the nanoparticles, an improved hydrogen generation was observed (reaching 1.068 mL h −1 cm −2 ) in the sample with CdSSe. The improvement was associated to a synergetic effect in the light absorption and higher cadmium chalcogenide amount deposited when sulfur ions were deposited before selenium.

Keywords: TiO 2 nanotubes; cadmium chalcogenide; nanoparticles; photoelectrochemical cell (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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