Abstract

Transparent nano-structured hematite (α-Fe2O3) films of approximately 550 nm thickness on tin-doped indium oxide (ITO) have been obtained conveniently by ink-jet printing of a Fe(NO3)3/Brij® O10 precursor ink and subsequent annealing at 500 °C in air. When illuminated with a blue LED (λ = 455 nm, ca. 100 mW cm−2), the hematite films exhibited photocurrents of up to 70 μA cm−2 at 0.4 V vs. SCE in 0.1 M NaOH electrolyte. Thermal annealing in vacuum at 500 °C for 2 h increased photocurrents more than three times to 230 μA cm−2 in agreement with previous literature reports for pure hematite materials. These results suggest that a simple ink-jetting process with surfactants is viable. The effects of vacuum-annealing on the photoelectrical properties of α-Fe2O3 films are discussed in terms of a sub-surface state templating hypothesis based on data gathered from photo-transients, field emission scanning electron microscopy, X-ray photoelectron spectroscopy analysis, X-ray diffraction, photocurrent spectra, and cyclic voltammetry.

LanguageEnglish
Pages289-295
Number of pages7
JournalApplied Catalysis B: Environmental
Volume211
DOIs
StatusPublished - 15 Aug 2017

Fingerprint

Ink jet printing
Hematite
annealing
Photocurrents
Surface-Active Agents
hematite
surfactant
Surface active agents
Vacuum
Annealing
Ink
indium
Tin
Surface states
tin
Field emission
Indium
electrolyte
X ray diffraction analysis
Electrolytes

Keywords

  • Hematite films
  • Oxygen evolution
  • Photoanode
  • Solar energy
  • Water splitting

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Cite this

Vacuum-annealing induces sub-surface redox-states in surfactant-structured α-Fe2O3 photoanodes prepared by ink-jet printing. / Bondarchuk, Alexander N.; Peter, Laurence M.; Kissling, Gabriela P.; Madrid, Elena; Aguilar-Martínez, Josué A.; Rymansaib, Zuhayr; Iravani, Pejman; Gromboni, Murilo; Mascaro, Lucia H.; Walsh, Aron; Marken, Frank.

In: Applied Catalysis B: Environmental, Vol. 211, 15.08.2017, p. 289-295.

Research output: Contribution to journalArticle

Bondarchuk, Alexander N. ; Peter, Laurence M. ; Kissling, Gabriela P. ; Madrid, Elena ; Aguilar-Martínez, Josué A. ; Rymansaib, Zuhayr ; Iravani, Pejman ; Gromboni, Murilo ; Mascaro, Lucia H. ; Walsh, Aron ; Marken, Frank. / Vacuum-annealing induces sub-surface redox-states in surfactant-structured α-Fe2O3 photoanodes prepared by ink-jet printing. In: Applied Catalysis B: Environmental. 2017 ; Vol. 211. pp. 289-295
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