Open-circuit photopotentials and photoelectrochemical behavior of the Si-Doped. cap alpha. -Fe/sub 2/O/sub 3/ semiconductor electrode in acetonitrile solutions
The photoelectrochemical behavior of Si-doped sintered polycrystalline ..cap alpha..-Fe/sub 2/O/sub 3/ was investigated in acetonitrile solutions containing the redox couples ferrocene, C1/sup -/, Br/sup -/, I/sup -/, Ru(bpy)/sub 3//sup 2 +/, Fe(bpy)/sub 3//sup 2 +/, and Fe(phen)/sub 3//sup 2 +/. There was no oxidation in the dark at the iron oxide electrode for these couples, but they all showed photo-oxidatio at potentials negative of their oxidation potential at Pt. Cathodic back reactions of all couples, except halides, were observed. This indicates that surface states capable of mediating electron transfer from the conduction band to the oxidize forms of the couples exist in the bandgap region of the iron oxide. In addition, open-circuit photovoltages were found to increase with increasing redox potentials of these couples. An open-circuit photopotential as high as 0.8V was obtained for Ru(bpy)/sub 3/ /SUP 3+/2+/ .
- Research Organization:
- Department of Chemistry, University of California, Santa Barbara, California
- OSTI ID:
- 6487911
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 132:5
- Country of Publication:
- United States
- Language:
- English
Similar Records
n-type Si-based photoelectrochemical cell: new liquid junction photocell using a nonaqueous ferricenium/ferrocene electrolyte
Photoelectrochemical cells for the production of hydrogen and hydrogen peroxide via photoredox reactions
Related Subjects
IRON OXIDES
PHOTOCHEMICAL REACTIONS
REDOX POTENTIAL
SEMICONDUCTOR MATERIALS
BROMINE COMPOUNDS
CHEMICAL REACTION KINETICS
CHLORINE COMPOUNDS
CRYSTAL DOPING
DOPED MATERIALS
ELECTRODES
FERROCENE
IRON COMPOUNDS
NITRILES
OXIDATION
PHOTOCHEMISTRY
POTENTIALS
RUTHENIUM COMPOUNDS
SILICON
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DIENES
ELEMENTS
HALOGEN COMPOUNDS
HYDROCARBONS
IRON COMPLEXES
KINETICS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLYENES
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SEMIMETALS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
360603* - Materials- Properties
360204 - Ceramics
Cermets
& Refractories- Physical Properties