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Author Pontikos, N. M. ♦ McCreery, R. L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ ELECTRODES ♦ SURFACE PROPERTIES ♦ CARBON ♦ CORRELATIONS ♦ DATA ANALYSIS ♦ ELECTROCHEMISTRY ♦ ELECTRON TRANSFER ♦ EXPERIMENTAL DATA ♦ KINETICS ♦ MEASURING INSTRUMENTS ♦ MEASURING METHODS ♦ CHEMISTRY ♦ DATA ♦ ELEMENTS ♦ INFORMATION ♦ NONMETALS ♦ NUMERICAL DATA 400400* -- Electrochemistry
Abstract Raman spectra, capacitance (C{degree}), phenanthrenequinone (PQ) adsorption, and heterogeneous electron-transfer rates for ferri/ferrocyanide, dopamine, and ascorbic acid were monitored after fracturing, polishing, and laser activating glassy carbon electrodes (GC-30). Alterations in the Raman spectrum indicate changes in carbon microstructure, while PQ adsorption and C{degree} provide measures of microscopic surface area. It was observed that polishing caused minor changes in carbon disorder and microscopic surface area, but the polished surface had poor electron-transfer kinetics. A k{degree} of above 0.5 cm s{sup {minus}1} was observed for Fe(CN){sub 6} for the first time. A clean, fractured GC surface exhibited a k{degree} of 0.5 cm s{sup {minus}1} and was very active toward ascorbic acid and dopamine oxidation. The results are consistent with a surface-cleaning mechanism for laser activation, accompanied by little or no observable surface restructuring or roughening.
ISSN 00027863
Educational Use Research
Learning Resource Type Article
Publisher Date 1990-06-06
Publisher Place United States
Journal Journal of the American Chemical Society
Volume Number 112
Issue Number 12


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