Investigation of Ceramic Fe2O3<Ta> Photoelectrodes for Solar Energy Photoelectrochemical Converters

V. M. Aroutiounian, V. M. Arakelyan, G. E. Shahnazaryan, G. M. Stepanyan, John A. Turner, O. Khaselev

Research output: Contribution to journalArticlepeer-review

82 Scopus Citations


Photocurrent and electrochemical impedance spectroscopy of a polycrystalline semiconductor photoelectrode, Fe2O3〈Ta〉, was carried out. The analysis of the frequency dispersion of the real and imaginary parts of the complex impedance allowed us to obtain an equivalent circuit for the electrochemical cell. The capacitance of the space-charge layer in the semiconductor electrode was isolated, and the limiting step of the electrode process was determined. Measurements of the temperature dependencies of the electroconductivity were used to determine the activation energy for the mobility of the charge carriers. A pair of simultaneously illuminated n-Fe2O3〈Ta〉 and p-Cu2O photoelectrodes were shown to split water spontaneously.

Original languageAmerican English
Pages (from-to)33-38
Number of pages6
JournalInternational Journal of Hydrogen Energy
Issue number1
StatePublished - Jan 2002

NREL Publication Number

  • NREL/JA-590-30137


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