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- Title
CuWO<sub>4</sub>|MnWO<sub>4</sub> heterojunction thin film with improved photoelectrochemical and photocatalytic properties using simulated solar irradiation.
- Authors
Lima, Aline E. B.; Assis, Marcelo; Resende, Andressa L. S.; Santos, Hugo L. S.; Mascaro, Lúcia H.; Longo, Elson; Santos, Reginaldo S.; Cavalcante, Laécio S.; Luz Jr, Geraldo E.
- Abstract
In this paper, we report the synthesis of CuWO4, MnWO4, and FTO|CuWO4|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|CuWO4 film, reaching 39 μA/cm2 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|CuWO4|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|CuWO4|MnWO4 heterojunction film. Mott-Schottky photocurrent response investigation revealed that the FTO|CuWO4|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.
- Subjects
THIN films; HETEROJUNCTIONS; ELECTRON-hole recombination; X-ray photoelectron spectroscopy; STANDARD hydrogen electrode; CONDUCTION bands; RHODAMINE B
- Publication
Journal of Solid State Electrochemistry, 2022, Vol 26, Issue 4, p997
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-022-05143-9