Applications of light-induced electron-transfer and hydrogen-abstraction processes: photoelectrochemical production of hydrogen from reducing radicals
A study of several photoprocesses which generate reducing radicals in similar photoelectrochemical cells was reported. Coupling of a light-induced reaction to produce a photocurrent concurrent with hydrogen generation in a second compartment can occur for a number of electron transfers and hydrogen abstractions in what appears to be a fairly general process. Irradiation of the RuL/sub 3//sup +2//Et/sub 3/N: photoanode compartment leads to production of a photocurrent together with generation of hydrogen at the cathode. A rather different type of reaction that also results in formation of two reducing radicals as primary photoproducts if the photoreduction of ketones and H-heteroaromatics by alcohols and other hydrogen atom donors. Irradiation of benzophenone/2-propanol/MV/sup +2/ solutions in the photoanode compartment (intensity 1.4 x 10/sup -8/ einstein/s) leads to a buildup of moderate levels of MV/sup +/ and to a steady photocurrent of 320 ..mu..A. The MV/sup +/ is oxidized at the anode of the photolyzed compartment with concomitant reduction of H/sup +/ in the cathode compartment. There was no decrease in benzophenone concentration over moderate periods of irradiation, and a steady production of hydrogen in the cathode compartment was observed. The photocurrent produced was linear with the square of absorbed light intensity. The quantum efficiency at the above-indicated intensity is 22%; quantitative analysis of the hydrogen produced gives good agreement with this value. 1 figure, 1 table. (DP)
- Research Organization:
- Univ. of North Carolina, Chapel Hill
- OSTI ID:
- 6992466
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 102:15
- Country of Publication:
- United States
- Language:
- English
Similar Records
n-type Si-based photoelectrochemical cell: new liquid junction photocell using a nonaqueous ferricenium/ferrocene electrolyte
Photoreactions and photoelectrochemical effects in supported multilayer assemblies. Mechanisms of interfacial reactions involving reactive supports, metalloporphyrin surface films, and solutions
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROGEN PRODUCTION
PHOTOCHEMICAL REACTIONS
ELECTRON TRANSFER
PHOTOELECTROCHEMICAL CELLS
CHEMICAL REACTIONS
ELECTROCHEMICAL CELLS
EQUIPMENT
SOLAR EQUIPMENT
080106* - Hydrogen- Production- Biosynthesis & Photochemical Processes
400500 - Photochemistry