CuWO4 vertical bar MnWO4 heterojunction thin film with improved photoelectrochemical and photocatalytic properties using simulated solar irradiation

Autor(es)

Lima, Aline E. B. ; Assis, Marcelo ; Resende, Andressa L. S. ; Santos, Hugo L. S. ; Mascaro, Lucia H. ; Longo, Elson ; Santos, Reginaldo S. ; Cavalcante, Laecio S. ; Luz, Geraldo E., Jr.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Solid State Electrochemistry; v. 26, n. 4, p. 15-pg., 2022-02-28.

Resumo

In this paper, we report the synthesis of CuWO4, MnWO4, and FTO vertical bar CuWO4 vertical bar MnWO4 as type II heterojunction thin film prepared by the drop-casting method. These thin films were synthesized by microwave-hydrothermal method with pure phase formation confirmed by X-ray diffraction (XRD), micro-Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) analyses. The photoelectrochemical response of these films was investigated under simulated illumination with AM 1.5 G type filter. The heterojunction displayed photocurrent density values two times higher than the FTO vertical bar CuWO4 film, reaching 39 mu A/cm(2) at 1.23 V versus normal hydrogen electrode. Optical and electrochemical characterizations revealed superior visible light absorption and lower charge transfer resistance for the FTO vertical bar CuWO4 vertical bar MnWO4 heterojunction thin film. Low photoluminescence emission and transient photocurrent data confirmed a decreased electronic charge transfer between the valence and the conduction band, besides a reduced electron-hole recombination rate for the FTO vertical bar CuWO4 vertical bar MnWO4 heterojunction film. Mott-Schottky photocurrent response investigation revealed that the FTO vertical bar CuWO4 vertical bar MnWO4 heterojunction thin film can be considered an excellent photoanode for photoelectrocatalytic applications under solar irradiation. Finally, the heterojunction exhibited better performance for the photodegradation of Rhodamine B (RhB), corresponding to 55.5% at 165 min. (AU)

• Processo FAPESP: 19/26860-2 - Síntese e modificação de filmes nanoestruturados de CuO/Ga2O4 e Cu2O/Ga2O4 aplicados na produção de H2 pela redução fotoeletroquímica da água
• Beneficiário: Hugo Leandro Sousa dos Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• 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