Premium
PHOTOCHEMICAL AND ELECTROCHEMICAL PROCESSES OF EXCITED DYES AT SEMICONDUCTOR AND METAL ELECTRODES *
Author(s) -
MEMMING R.
Publication year - 1972
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1972.tb06302.x
Subject(s) - oxidizing agent , semiconductor , electrode , electrochemistry , photochemistry , excited state , metal , photoelectrochemistry , electron transfer , chemistry , materials science , cathodic protection , adsorption , inorganic chemistry , optoelectronics , atomic physics , organic chemistry , physics
— Sensitization processes at semiconductor and metal electrodes were studied. With semiconductor electrodes, anodic as well as cathodic photocurrents were observed, depending on the semiconducting material. These photocurrents are caused by electron transfer between the electrode and the excited dye molecule adsorbed on the surface. With metals, photocurrents occur only in the presence of reducing or oxidizing agents, due to photochemical processes in the bulk of the dye solution. The different phenomena for semiconductors and metals are compared and the mechanism of supersensitization is discussed in detail.