Quantitative correlations of heterogeneous electron-transfer kinetics with surface properties of glassy carbon electrodes

Journal Article · Wed Jun 06 04:00:00 EDT 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00168a001· OSTI ID:6652512

Rice, R J; Pontikos, N M; McCreery, R L ^[1]

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1. Ohio State Univ., Columbus (USA)

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.

• OSTI ID: 6652512
• Journal Information: Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 112:12; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
CARBON
CHEMISTRY
CORRELATIONS
DATA
DATA ANALYSIS
ELECTROCHEMISTRY
ELECTRODES
ELECTRON TRANSFER
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
KINETICS
MEASURING INSTRUMENTS
MEASURING METHODS
NONMETALS
NUMERICAL DATA
SURFACE PROPERTIES