Semiconductor electrodes. 30. Spectral sensitization of the semiconductors n-TiO/sub 2/ and n-WO/sub 3/ with metal phthalocyanines
Thin films (100 to 250 A) of several phthalocyanines (MgPc, ZnPc, AlClPc, TiOPc, CoPc, FePc, H/sub 2/Pc) were investigated as sensitizers for photoelectrochemical processes at n-type TiO/sub 2/ and WO/sub 3/ single crystal electrodes in aqueous solution. The sensitized oxidation of several solution species (I/sup -/, Fe(CN)/sub 6//sup 4 -/, hydroquinone, Fe(II)-EDTA) occurred with photocurrents proportional to light intensity and spectral responses characteristic of the metal phthalocyanine (MPc) films. At negative electrode potentials cathodic photocurrents for the reduction of benzoquinone, O/sub 2/, and Fe(III)-EDTA were observed, consistent with the p-type behavior of the phthalocyanines themselves. The photoelectrochemical behavior is rationalized from the energy levels of the semiconductors, solution couples, and MPc. The surface ionization potentials were found to yield better estimates of the phthalocyanine levels than the redox potentials of the MPc couples (measured in N,N-dimethylacetamide solutions).
- Research Organization:
- Univ. of Texas, Austin
- OSTI ID:
- 5113015
- Journal Information:
- J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 102:16; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
400500 -- Photochemistry
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
AMINO ACIDS
ANODES
AQUEOUS SOLUTIONS
AROMATICS
BENZOQUINONES
CARBOXYLIC ACIDS
CATHODES
CHALCOGENIDES
CHELATING AGENTS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE COMPOUNDS
COBALT COMPOUNDS
COMPLEXES
DISPERSIONS
DYES
EDTA
EFFICIENCY
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRODES
EQUIPMENT
FERROCYANIDES
FILMS
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
IODIDES
IODINE COMPOUNDS
IONIZATION POTENTIAL
IRON COMPLEXES
IRON COMPOUNDS
MAGNESIUM COMPOUNDS
MATERIALS
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHOTOANODES
PHOTOCATHODES
PHOTOCHEMISTRY
PHOTOELECTROCHEMICAL CELLS
PHTHALOCYANINES
QUANTUM EFFICIENCY
QUINONES
REAGENTS
REDOX REACTIONS
REDUCTION
SEMICONDUCTOR MATERIALS
SENSITIZERS
SOLAR EQUIPMENT
SOLUTIONS
SPECTRAL RESPONSE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
VOLTAMETRY
ZINC COMPOUNDS