Photoanodes on titanium substrates: one-step deposited BiVO4 versus two-step nano-V2O5 films impregnated with Bi3+

Murilo F. Gromboni, Moisés A. Araújo, Elizabeth Downey, Frank Marken, Lucia H. Mascaro

Research output: Contribution to journalArticle

3 Citations (Scopus)
139 Downloads (Pure)

Abstract

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 °C) and after further mild annealing at 400 °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.

Original languageEnglish
Pages (from-to)273-283
Number of pages11
JournalJournal of Solid State Electrochemistry
Volume20
Issue number1
Early online date17 Sep 2015
DOIs
Publication statusPublished - Jan 2016

Keywords

  • Energy
  • Nucleation
  • PEG
  • Photovoltammetry
  • Titanium
  • Water splitting

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