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Determination of microscopic electrode kinetics with electrogenerated chemiluminescence imaging
Author(s) -
Pharr Christine M.,
Engstrom Royce C.,
Klancke James,
Unzelman Patty L.
Publication year - 1990
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140020308
Subject(s) - chemiluminescence , luminol , glassy carbon , electrode , kinetics , porphyrin , materials science , carbon fibers , chemistry , peroxide , analytical chemistry (journal) , photochemistry , electrochemistry , cyclic voltammetry , organic chemistry , composite material , physics , quantum mechanics , composite number
Light produced by the electrogenerated chemiluminescence reaction of luminol in alkaline peroxide was monitored with a sensitive imaging system. The light images were taken to represent the level of microscopically local activity on the electrode surface with a spatial resolution in the submicrometer domain. The temporal resolving capabilities of the imaging system permitted the construction of time‐sequenced images and intensity‐potential profiles, the latter being equivalent to a microscopically local voltammogram. Spatial variation in luminol oxidation kinetics were observed at porphyrin‐coated glassy carbon, carbon paste, and anodized glassy carbon electrodes. Implications for other composites and microelectrodes are discussed.