Photoelectrochemical cells for the production of hydrogen and hydrogen peroxide via photoredox reactions
The performance of various dye-sensitized photoredox systems leading to either water reduction on Br/sup -/ oxidation has been examined in photoelectrochemical cells. In the first part, we consider visible-light-induced H/sub 2/ evolution sensitized by dues such as Ru(bpy)/sub 3//sup 2 +/, water soluble zinc prophyrin (zinc tetrakis(4-N-methylpyridyl)porphyrin, ZnTMPyP), proflavin, and phenosafranine. Various factors such as the oxidative vs reductive cycle, the role of relay and its concentration, etc., in relation to photoelectrochemical cells are examined. A quantitative analysis and a kinetic model for the current-potential curves in cells involving photoredox reactions (systems involving oxidative quenching) is presented. Later, the cell system C/Ru(bpy)/sub 3//sup 2 +/,MV/sup 2 +/,O/sub 2/ parallel HBr/C is examined in detail, where photoinduced oxygen reduction to H/sub 2/O/sub 2/ is coupled to bromide oxidation. For all the cell systems examined, there is good agreement between the observed photocurrents and photopotentials with those deduced from the intersection of the individual i-e curves. 8 figures, 2 tables.
- Research Organization:
- Ecole Polytechnique Federale, Lausanne, Switzerland
- OSTI ID:
- 6550086
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 86:14
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HYDROGEN PEROXIDE
PRODUCTION
HYDROGEN PRODUCTION
PHOTOLYSIS
PROFLAVINE
CATALYTIC EFFECTS
PYRAZINES
RUTHENIUM COMPLEXES
ZINC COMPLEXES
AMINES
AROMATICS
AZINES
BIPYRIDINES
CATALYSTS
CHEMICAL REACTION KINETICS
EDTA
EXPERIMENTAL DATA
HYDROBROMIC ACID
OXIDATION
PHOTOELECTROCHEMICAL CELLS
PORPHYRINS
REDOX REACTIONS
TIME DEPENDENCE
WATER
ACRIDINES
AMINO ACIDS
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMICAL REACTIONS
COMPLEXES
DATA
DECOMPOSITION
ELECTROCHEMICAL CELLS
EQUIPMENT
FLAVINES
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
KINETICS
MUTAGENS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PEROXIDES
PHOTOCHEMICAL REACTIONS
PYRIDINES
REACTION KINETICS
SOLAR EQUIPMENT
TRANSITION ELEMENT COMPLEXES
080106* - Hydrogen- Production- Biosynthesis & Photochemical Processes