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research article

Aqueous photoelectrochemistry of hematite nanorod array

Lindgren, Torbjorn
•
Wang, Heli
•
Beermann, Niclas
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2002
Solar Energy Materials and Solar Cells

A unique nanostructured rod-like morphol. of hematite (α-Fe2O3), designed with no grain boundaries, has been investigated for the aim of a direct splitting of water at the hematite/electrolyte interface. Photoelectrochem. properties were studied by steady-state measurements on electrodes with controlled morphol. and film thickness in aq. electrolyte. The hematite electrodes were able to generate incident photon-to-current efficiencies (IPCEs) of ∼8% by illumination through the substrate with a wavelength of 350 nm and a light intensity of 0.1 mW cm-2 without any applied voltage. On the basis of light intensity studies, it is concluded that charge carrier recombinations due to the poor semiconductor properties in combination with slow oxidn. kinetics at the hematite nanorods/electrolyte interface are the dominating problems. However, the high IPCE values obtained indicates that purpose-built nanorods of hematite is one significant way to strikingly lower the recombination rate of hematite material.

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Type
research article
DOI
10.1016/S0927-0248(01)00062-9
Author(s)
Lindgren, Torbjorn
Wang, Heli
Beermann, Niclas
Vayssieres, Lionel
Hagfeldt, Anders  
Lindquist, Sten-Eric
Date Issued

2002

Published in
Solar Energy Materials and Solar Cells
Volume

71

Start page

231

End page

243

Subjects

hematite nanorod electrode water direct splitting photoelectrochem aq soln

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LSPM  
Available on Infoscience
July 6, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/115676
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