Photochemical conversion of solar energy. Quarterly progress report, 1 Jan--31 Mar 1975

Technical Report · Fri May 09 04:00:00 EDT 1975

OSTI ID:7134317

Lichtin, N N

Results of reverse-bias experiments with the iron-thionine thin layer-totally illumined photogalvanic cell with SnO/sub 2/ and Pt electrodes (TI--TL SnO/sub 2//Pt cell) indicated that output is not limited by electrode activation processes. In solutions acidified with H/sub 2/SO/sub 4/, Fe(II) reduces triplet methylene blue 12 times faster in 50 v/v % aq. CH/sub 3/CN than in water while the rate of unimolecular decay of the triplet is unaffected by the change in solvent. Reduction of the triplet by FE(II) is 4 times faster when sulfate is the only anion in solution than in the presence of TFMS(-). Oxidation of methylene blue semiquinone by FE(III) is six times slower in acidified 50 v/v % aq. CH/sub 3/CN than in acidified water. Output of the TI--TL SnO/sub 2//Pt iron-thionine cell is greater when acidification is with sulfuric acid than with several other acids. Significant outputs were obtained when Co (II) EDTA/Co (III) EDTA or hydroquinone/quinone were substituted for Fe(II)/Fe(III) in the TI--TL SnO/sub 2//Pt cell. Work was begun on design and construction of sealed TI--TL cells. Small increases in the quantum yield for production of Br/sub 2/ by 436 nm photolysis of acidified aqueous FeBr/sub 3/ were achieved. (GRA)

• Research Organization: Boston Univ., Mass. (USA). Dept. of Chemistry
• OSTI ID: 7134317
• Report Number(s): PB-252962; NSF/RANN/SE/AER-72-03597/A03/75-1
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
AMINES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELECTROCHEMICAL CELLS
ELEMENTS
HETEROCYCLIC COMPOUNDS
IRON
KINETICS
METALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOGALVANIC CELLS
REACTION KINETICS
REDUCTION
THIONINE
TIN COMPOUNDS
TIN OXIDES
TRANSITION ELEMENTS