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

Author(s)

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

• Document type: Journal article
• Source: Journal of Applied Electrochemistry; v. 53, n. 7, p. 19-pg., 2023-01-18.

Abstract

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)

• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC