Nanostructured Ti-doped hematite (α-Fe2O3) photoanodes for efficient photoelectrochemical water oxidation

Myeong Hwan Lee, Jong Hoon Park, Hyun Soo Han, Hee Jo Song, In Sun Cho, Jun Hong Noh, Kug Sun Hong

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

We present a form of hematite (α-Fe2O3) nanostructured architecture suitable for photoelectrochemical water oxidation that is easily synthesized by a pulsed laser deposition (PLD) method. The architecture is a column-like porous nanostructure consisting of nanoparticles 30-50 nm in size with open channels of pores between the columns. This nanostructured film is generated by controlling the kinetic energy of the ablated species during the pulsed laser deposition process. In a comparison with the nanostructured film, hematite thin film was also synthesized by PLD. All of the developed films were successfully doped with 1.0 at% of titanium. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and UV-visible spectroscopy were used to characterize the films. To fabricate the photoelectrochemical (PEC) cell, Ti-doped hematite films were used as the working electrode, Ag/AgCl as the reference electrode, platinum wire as the counter electrode and an aqueous solution of 1 M NaOH as the electrolyte. The photovoltaic characteristics of all cells were investigated under AM 1.5G sunlight illumination of 100 mW/cm2. The photocurrent density was enhanced by approximately 220% using nanostructured film at 0.7 V versus Ag/AgCl compared to hematite thin film, and the highest photocurrent density of 2.1 mA/cm2 at 0.7 V/Ag/AgCl was obtained from the 1.0 at% Ti-doped hematite nanostructured film. The enhanced photocurrent density is attributed to its effective charge collection due to its unique column-like architecture with a large surface area.

Original languageEnglish
Pages (from-to)17501-17507
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number30
DOIs
Publication statusPublished - 2014 Oct 13
Externally publishedYes

Fingerprint

Hematite
hematite
Oxidation
oxidation
water
Pulsed laser deposition
Water
Photocurrents
pulsed laser deposition
photocurrents
Electrodes
electrodes
Photoelectrochemical cells
Thin films
sunlight
thin films
cells
Kinetic energy
Field emission
Platinum

Keywords

  • Column-like
  • Hematite
  • Nanostructure
  • Photoelectrochemical
  • Pulsed laser deposition (PLD)

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Nanostructured Ti-doped hematite (α-Fe2O3) photoanodes for efficient photoelectrochemical water oxidation. / Lee, Myeong Hwan; Park, Jong Hoon; Han, Hyun Soo; Song, Hee Jo; Cho, In Sun; Noh, Jun Hong; Hong, Kug Sun.

In: International Journal of Hydrogen Energy, Vol. 39, No. 30, 13.10.2014, p. 17501-17507.

Research output: Contribution to journalArticle

Lee, Myeong Hwan ; Park, Jong Hoon ; Han, Hyun Soo ; Song, Hee Jo ; Cho, In Sun ; Noh, Jun Hong ; Hong, Kug Sun. / Nanostructured Ti-doped hematite (α-Fe2O3) photoanodes for efficient photoelectrochemical water oxidation. In: International Journal of Hydrogen Energy. 2014 ; Vol. 39, No. 30. pp. 17501-17507.
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