Bibliographic Citation
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Title | Dark electrochemistry and photoelectrochemistry of molecularly doped ion-exchange polymer blends |
Creator/Author | Crouch, A.M. ; Ordonez, I. ; Langford, C.H. ; Lawrence, M.F. |
Publication Date | 1988 Oct 20 |
OSTI Identifier | OSTI ID: 6186475 |
Other Number(s) | CODEN: JPCHA |
Resource Type | Journal Article |
Resource Relation | J. Phys. Chem. ; Vol/Issue: 92:21 |
Research Org | Concordia Univ., Montreal, Quebec (Canada) |
Subject | 400500 -- Photochemistry ;400400 -- Electrochemistry ;140501 -- Solar Energy Conversion-- Photovoltaic Conversion; COPPER COMPLEXES-- PHOTOCHEMICAL REACTIONS;PYRIDINE-- PHOTOCHEMICAL REACTIONS;STYRENE-- PHOTOCHEMICAL REACTIONS;ZINC COMPLEXES-- PHOTOCHEMICAL REACTIONS; COPOLYMERS;DYES;ELECTROCHEMISTRY;EXPERIMENTAL DATA;ION EXCHANGE MATERIALS;POLYMERS |
Related Subject | ALKYLATED AROMATICS;AROMATICS;AZINES;CHEMICAL REACTIONS;CHEMISTRY;COMPLEXES;DATA;HETEROCYCLIC COMPOUNDS;HYDROCARBONS;INFORMATION;MATERIALS;NUMERICAL DATA;ORGANIC COMPOUNDS;ORGANIC NITROGEN COMPOUNDS;ORGANIC POLYMERS;POLYMERS;PYRIDINES;TRANSITION ELEMENT COMPLEXES |
Description/Abstract | Ion-exchange polymer blends have been shown to produce modified electrode surfaces with high affinities for ionic reactants.^The main feature of these blends is their spontaneous tendency to segregate into hydrophilic and hydrophobic domains.^It is now believed that, when appropriate dye molecules are incorporated into such films and then illuminated, these systems operate under both ionic and dry electronic conduction mechanisms.^The dark electrochemical measurements performed on an ion-exchange polymer containing ZnTPPS/sup 4 -/, ZnTPP, ZnPc(OPh)/sub 4/, or CuPcTS/sub 4-/, in contact with a Fe(CN)/sub 6//sup 3-/4-/ redox solution, show that the dye molecules within the film are immobile and that the high ion-exchange capability is maintained.^The photoelectrochemical results obtained with the dye-loaded films indicate that electrons may be transferred from the photoexcited dyes to the polymer matrix and transported to the SnO/sub 2/ substrate electrode.^The oxidized dye molecules are reduced by accepting electrons from the Fe(CN)/sub 6//sup 4 -/ species.^The electronic conduction following charge separation is assumed to be intimately related to the ion-exchange polymer`s tendency to segregate into hydrophilic and hydrophobic domains and also the excited-state energetics of the dye.^A model which invokes the existence of large distributions of molecular ion states is proposed to explain the conduction of electrons through the hydrophobic domains of the polymer film and a detailed energy level diagram is presented to summarize the overall situation. |
Country of Publication | United States |
Language | English |
Format | Pages: 6058-6065 |
System Entry Date | 2001 May 13 |
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