The iron oxyhydroxide role in the mediation of charge transfer for water splitting using bismuth vanadate photoanodes

Autor(es)

de Araujo, Moises A. ; Coelho, Dyovani ; Mascaro, Lucia H. ; Pereira, Ernesto C.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Solid State Electrochemistry; v. 22, n. 5, p. 10-pg., 2018-05-01.

Resumo

The water photo-oxidation to oxygen on iron oxyhydroxide (FeOOH) deposited on a surface of semiconductor materials play a crucial role in the enhancement of different devices. In order to investigate how FeOOH works to produce O-2 from water splitting, we have investigated the role of a deposited layer of FeOOH on the bismuth vanadate (BiVO4) films. The simple-modified method based on polyethylene glycol was applied to produce BiVO4 nanostructures and a FeOOH photoelectrodeposition methodology was used to cover the BiVO4 film surface. The photoelectrochemistry study for FeOOH modified BiVO4 revealed a 3.4 times increase in the photocurrent at 1.23 V vs. RHE. A possible explanation to the FeOOH mechanism is that it is actually a green rust containing a mixture of Fe (II) and Fe (III) that acts as center of charge transfer mediation and not as a catalyst itself. This hypothesis has been supported by a change absence in the onset potential, no photocurrent saturation, and no change in the charge carrier density. Moreover, the FeOOH also passivated the surface states of BiVO4 as the open circuit potential shifted 70 mV vs. RHE to more positive potentials. (AU)

• Processo FAPESP: 16/12681-0 - Obtenção e caracterização de filmes finos do semicondutor ternário sulfeto de antimônio e estanho, TAS (T=estanho,A=antimônio e S=enxofre), para aplicação em células fotovoltaicas
• Beneficiário: Moisés Albuquerque de Araújo
• 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