Banca de QUALIFICAÇÃO: ALINE ESTEFANY BRANDÃO LIMA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE: ALINE ESTEFANY BRANDÃO LIMA
DATA: 31/05/2021
HORA: 14:30
LOCAL: sala virtual - https://meet.google.com/rbi-dwgp-dkd
TÍTULO: CuWO4-MnWO4 heterojunction photoanode with improved photoelectrochemical properties for solar energy conversion
PALAVRAS-CHAVES: Semiconductor heterojunction · CuWO4MnWO4 · Photoelectrochemical · Microwave-hydrothermal
PÁGINAS: 27
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Cinética Química e Catálise
RESUMO:

In this work, we reported FTOCuWO₄MnWO₄ type II heterojunction films synthesized by microwave-hydrothermal method and prepared using the drop-casting methodology. The formation of heterojunction was confirmed through X-ray diffraction (XRD), Micro-Raman, and X-ray photoelectron spectroscopy (XPS) analysis. MnWO₄ nanorods were deposited on top of flake-like CuWO₄, thus forming a heterojunction with efficient charge transfer. The photocurrent response of films was investigated under simulated AM1.5G illumination. The heterojunction yields 2 times improved photocurrent density in comparison with that of pristine FTOCuWO₄, reaching 39A/cm² at 1.23 V versus normal hydrogen electrode. Higher visible light absorption and lower charge transfer resistance were observed for the FTOCuWO₄MnWO₄ heterojunction. Photocurrent kinetic curve studies confirmed the reduced electron-hole recombination rate for the heterojunction. This material provides a heterojunction photocatalyst with a potential improved performance for photocatalytic applications.

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