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

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107 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

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Titanium
titanium
Substrates
xenon lamps
Xenon
Tin
Titanium oxides
paints
Photocatalysts
ITO (semiconductors)
Photocurrents
Electric lamps
Paint
Impregnation
titanium oxides
indium oxides
Indium
Polyethylene glycols
photocurrents
glycols

Keywords

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

Cite this

Photoanodes on titanium substrates : one-step deposited BiVO4 versus two-step nano-V2O5 films impregnated with Bi3+. / Gromboni, Murilo F.; Araújo, Moisés A.; Downey, Elizabeth; Marken, Frank; Mascaro, Lucia H.

In: Journal of Solid State Electrochemistry, Vol. 20, No. 1, 01.2016, p. 273-283.

Research output: Contribution to journalArticle

Gromboni, Murilo F. ; Araújo, Moisés A. ; Downey, Elizabeth ; Marken, Frank ; Mascaro, Lucia H. / Photoanodes on titanium substrates : one-step deposited BiVO4 versus two-step nano-V2O5 films impregnated with Bi3+. In: Journal of Solid State Electrochemistry. 2016 ; Vol. 20, No. 1. pp. 273-283.
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