Photochemical conversion of solar energy. Semi-annual progress report, January 1, 1974--June 30, 1974. [Iron--thionine]
Technical Report
·
OSTI ID:5415081
A 1.5% quantum efficiency for conversion of absorbed 578 nm light into electrical power and a 64% quantum efficiency for generating charge carriers have been achieved in an aqueous iron-thionine photogalvanic cell with one illuminated electrode. Under the same conditions efficiency for conversion of incident light into electrical power was 1.7 x 10/sup -3/%. A 0.8% quantum efficiency for conversion of absorbed 578 nm light has been obtained with a thin-layer totally-illuminated (TI) aqueous iron-thionine cell with SnO/sub 2/ and Pt electrodes. With low light intensities a 7.5 x 10/sup -2/% efficiency for power conversion of incident 578 nm light was observed with this cell. Higher outputs were obtained with certain aqueous organic solvents. A 24-unit panel of SnO/sub 2//Pt TI cells was used to operate a motor drawing 0.4 V and 300 ..mu.. amp in sunlight. The second order rate of disproportionation of semithionine, k/sub d/, varies approx. 10/sup 3/ fold with solvent composition in a variety of aqueous-organic solvents; k/sub d/ correlates with Kosower's solvent parameter Z. Association of Fe(II) with thionine could not be detected by a kinetic method, absorption spectrophotometry (200--1800 nm) or paper electrophoresis. The stoichiometry and kinetics of reaction of Fe(III) with leucothionine has been studied in a series of aqueous N,N-dimethylacetamide solvents.
- Research Organization:
- Boston Univ., Mass. (USA). Dept. of Chemistry
- OSTI ID:
- 5415081
- Report Number(s):
- NSF/RANN/SE/GI-38103/PR/74/2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
AMINES
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHARGE CARRIERS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DISPERSIONS
EFFICIENCY
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
HETEROCYCLIC COMPOUNDS
IRON
KINETICS
METALS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SOLVENTS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMISTRY
PHOTOGALVANIC CELLS
PLATINUM
PLATINUM METALS
REACTION KINETICS
REDOX REACTIONS
RESEARCH PROGRAMS
SOLUTIONS
SOLVENTS
THIONINE
TIN COMPOUNDS
TIN OXIDES
TRANSITION ELEMENTS
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
AMINES
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHARGE CARRIERS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DISPERSIONS
EFFICIENCY
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
HETEROCYCLIC COMPOUNDS
IRON
KINETICS
METALS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SOLVENTS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMISTRY
PHOTOGALVANIC CELLS
PLATINUM
PLATINUM METALS
REACTION KINETICS
REDOX REACTIONS
RESEARCH PROGRAMS
SOLUTIONS
SOLVENTS
THIONINE
TIN COMPOUNDS
TIN OXIDES
TRANSITION ELEMENTS