| Texto completo | |
| Autor(es): |
Gromboni, Murilo F.
[1]
;
Araujo, Moises A.
[1]
;
Downey, Elizabeth
[2]
;
Marken, Frank
[2]
;
Mascaro, Lucia H.
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Bath, Dept Chem, Bath BA2 7AY, Avon - England
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Solid State Electrochemistry; v. 20, n. 1, p. 273-283, JAN 2016. |
| Citações Web of Science: | 3 |
| Resumo | |
One-step deposition of photoelectrochemically active BiVO4 (monoclinic) from a polyethylene glycol (PEG300) precursor paint onto titanium substrates is demonstrated to lead to more complex multioxide phase films. Photocurrents in 0.5 M Na2SO4 remain relatively low when compared to those reported on tin-doped indium oxide (ITO) substrates, possibly due to the effect of detrimental underlying titanium oxide phases or mixed phases. For comparison, the one-step deposition is demonstrated also for the direct formation of V2O5 nanocrystalline films, which also exhibited low photoelectrochemical activity. Impregnation of nanocrystalline V2O5 with aqueous Bi3+ is shown to cause substantial recrystallization with formation of much more photoactive BiVO4. In particular, on low-temperature (high surface area) nano-V2O5 (400 A degrees C) and after further mild annealing at 400 A degrees C much improved photoelectrochemical water oxidation activity (ca. 0.3 mA cm(-2) at 1.0 V vs Ag/AgCl (KCl (3 M) at 0.1-W cm(-2) xenon lamp radiation) is observed. This opens up a new mild temperature two-step route for BiVO4 photocatalysts on practical titanium substrates. (AU) | |
| 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 |