Unveiling BiVO4 photoelectrocatalytic potential for CO2 reduction at ambient temperature
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FLORYMAR ESCALONA-DURAN
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Here, we explore monoclinic BiVO4 as a cathode in a photoelectrochemical (PEC) system for CO2
reduction (CO2R). The catalyst was prepared using a simple oxidant peroxide method with crystallization
under hydrothermal conditions, and subsequently sprayed on the FTO substrate. CO2R was carried out
in an inflow and sealed electrochemical system for 6 h. The best performance was found to be under
photoelectrocatalysis powered by a light-emitting diode (LED) as an illumination source when compared to
photocatalysis (using different halogen UV and LED illumination), electrocatalysis, and photoelectrocatalysis
powered by a halogen UV illumination source, with total production values of 22 and 5.5 mmol cm2 for
methanol and acetic acid, respectively. This achievement occurs because, even though BiVO4 as a
photocatalyst does not have sufficient potential to drive CO2R, an external potential can be applied to drive
the reaction. Moreover, the photogenerated electron–hole pairs are guided by the external potential,
improving the charge separation and promoting the rapid electron transfer to reduce CO2 on the photoelectrocathode at a lower overpotential when compared to electrocatalysis. LED illumination produced
higher amounts of products than UV illumination because UV light affects the catalyst surface altering the
number of catalytic sites available for the reaction and reducing their performance.
Como referenciar
SILVA, RICARDO M. e; DIAS, EDUARDO H.; ESCALONA-DURAN, FLORYMAR; SILVA, GELSON T. dos S.T. da; ALNOUSH, WAJDI; OLIVEIRA, JESSICA A. de; HIGGINS, DREW; RIBEIRO, CAUE. Unveiling BiVO4 photoelectrocatalytic potential for CO2 reduction at ambient temperature. Materials Advances, v. 5, n. 11, p. 4857-4864, 2024. DOI: 10.1039/d4ma00232f. Disponível em: https://repositorio.ipen.br/handle/123456789/48122. Acesso em: 30 Dec 2025.
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