Light energy conversion with chlorophyll monolayer electrodes. In vitro electrochemical simulation of photosynthetic primary processes
The photoelectrochemical behavior of chlorophyll (Chl) a and b monolayers, deposited on SnO/sub 2/ optically transparent electrodes by means of the Langmuir--Blodgett technique, has been investigated. Photocurrents and photovoltages were always anodic and negative, respectively, corresponding to an electron injection from excited Chl molecules to the conduction band of SnO/sub 2/. Spectra of photocurrents and photovoltages coincided well with the absorption spectra of Chl monolayers at the SnO/sub 2/-solution interface. Effects of light intensity, electrode potential, redox agents added, and solution pH on the magnitude of the photocurrent were studied in detail. The quantum efficiency for photocurrent generation was measured with Chl a--stearic acid mixed monolayers, and a highest value of 12 to 16% was attained at the Chl a/stearic acid molar ratio of ca. 1.0. The usefulness of the present system for an in vitro simulation of photosynthetic primary processes is suggested. 2 tables; 16 figures.
- Research Organization:
- Tokyo Univ., Japan
- OSTI ID:
- 6781517
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 100:21
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
09 BIOMASS FUELS
CHLOROPHYLL
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
SIMULATION
TIN OXIDES
ABSORPTION SPECTRA
ASCORBIC ACID
EFFICIENCY
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRODEPOSITION
ELECTRODES
ELECTRON TRANSFER
EXCITED STATES
IN VITRO
INTERFACES
LAYERS
OCTADECANOIC ACID
PH VALUE
QUINONES
REDOX REACTIONS
SOLAR ENERGY CONVERSION
TIME DEPENDENCE
AROMATICS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CONVERSION
CURRENTS
DEPOSITION
ELECTROLYSIS
ENERGY CONVERSION
ENERGY LEVELS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
LYSIS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PORPHYRINS
SPECTRA
SURFACE COATING
SYNTHESIS
TIN COMPOUNDS
VITAMINS
400500* - Photochemistry
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)