Bimetallic PtCu nanoparticles supported over CeO2 nanorods as (photo)electrocatalysts for the methanol oxidation reaction
Por:
Araiza D.G., Mora-Hernández J.M., de León J.N.D., Torres-Martínez L.M., Díaz G.
Publicada:
1 ene 2025
Resumen:
A series of Pt, Cu and bimetallic PtCu nanoparticles deposited on the surface of CeO2 nanorods were synthesized and employed as electrocatalysts in the methanol oxidation reaction (MOR) assisted by UV radiation. The samples were studied using ESD-SEM, XRD, TEM, N2 adsorption-desorption isotherms, H2-TPR, XPS, UV–vis, and PL spectroscopies. Characterization confirmed that the CeO2 nanorods exhibited reactive (100) surface planes, with copper existing predominantly in the oxidic form (as CuO/Cu(OH)2) and platinum as metallic species. Notably, a PtCu alloy phase emerged in the bimetallic Pt1Cu4/Ce-r catalyst, which probably promotes methanol adsorption. Electrochemical analyses revealed that the monometallic Pt/Ce-r catalyst displayed enhanced photoactivity, attributed to the effective charge transfer of the interface between CeO2 and Pt, resulting in improved electron mobility and minimal recombination. The bimetallic Pt1Cu4/Ce-r catalyst has emerged as the most effective material, with an optimal photoelectrocatalytic response driven by the synergistic interactions between CeO2, Pt, and Cu/Cu2+ species, leading to significant overpotential reduction and increased interaction sites. © 2025 Elsevier B.V.
Filiaciones:
Araiza D.G.:
Instituto de Física, Departamento de Física Química, Universidad Nacional Autónoma de México, Ciudad de México, C.P. 04510, Mexico
Mora-Hernández J.M.:
Secihti - Universidad Autónoma de Nuevo León, UANL, Facultad de Ingeniería Civil, Departamento de Ecomateriales y Energía, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, Nuevo León, C.P. 66455, Mexico
de León J.N.D.:
Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Baja California, Ensenada, C.P. 22860, Mexico
Torres-Martínez L.M.:
Centro de Investigación en Materiales Avanzados, S.C. (CIMAV), Miguel de Cervantes No 120. Complejo Ind. Chihuahua, Chih, Chihuahua, C.P. 31136, Mexico
Díaz G.:
Instituto de Física, Departamento de Física Química, Universidad Nacional Autónoma de México, Ciudad de México, C.P. 04510, Mexico
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