Transition metal tungstates AWO₄ (A²⁺ = Fe, Co, Ni, and Cu) thin films and their photoelectrochemical behavior as photoanode for photocatalytic applications

Autor(es)

Costa, Maria Joseita dos Santos ; Lima, Aline Estefany Brandao ; Ribeiro, Ester Pamponet ; Costa, Gilson dos Santos ; Longo, Elson ; da Luz, Geraldo Eduardo ; Cavalcante, Laecio Santos ; Santos, Reginaldo da Silva

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Electrochemistry; v. 53, n. 7, p. 19-pg., 2023-01-18.

Resumo

This paper discusses about a facile transition metal tungstate thin films preparation method and their remarkable photoelectrochemical properties. The films of AWO(4) (A(2+) = Fe, Co, Ni, Cu) were deposited onto conductive fluorine-doped tin oxide (FTO) glass substrate. The results of X-ray diffraction analysis indicated the presence of crystalline films. Field emission scanning electron microscopy images revealed nanostructured materials. X-ray photoelectron studies were employed to analyze elemental and chemical composition. Optical behavior indicated indirect transitions for all AWO(4) films. Photoelectrochemical studies displayed that AWO(4) films were successfully used as photoanodes in a photoelectrochemical cell under polychromatic irradiation. From electrochemical measurement, it was possible to estimate the flat band potential and so prevising suitable application of photoelectrodes. This work reports for the first time a comparative and comprehensive photoelectrochemical study with AWO(4) films prepared in a simple way. The results indicate that the films can be used as photoanodes in water splitting reactions and other photoelectrocatalytic applications. [GRAPHICS] . (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs