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Fast heterogeneous electron-transfer rates for glassy carbon electrodes without polishing or activation procedures

Technical Report ·
OSTI ID:5386387
; ;
Glassy carbon (CG) is an attractive choice for an electrode material because it has a wide potential range, is inexpensive, readily available, and chemically inert in most electrolytes. The typical preparation of a GC electrode includes the removal of gross surface features by abrasion with silicon carbide paper and subsequent polishing with alumina. The electrochemistry of many redox systems such as ascorbic acid (AA), ferri/ferrocyanide, and dopamine on GC are very sensitive to the polishing procedure, with variations in the heterogeneous electron transfer rate constant K(o), for the Fe(CN){sub 6} (3-/4-) redox system covering at least three orders of magnitude. This variation has been attributed primarily to superficial impurities and polishing debris.
Research Organization:
Ohio State Univ., Columbus, OH (USA). Dept. of Chemistry
OSTI ID:
5386387
Report Number(s):
AD-A-211674/7/XAB
Country of Publication:
United States
Language:
English

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25 ENERGY STORAGE
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ABRASION
AMINES
AROMATICS
ASCORBIC ACID
AUTONOMIC NERVOUS SYSTEM AGENTS
CARBIDES
CARBON
CARBON COMPOUNDS
CARDIOTONICS
CARDIOVASCULAR AGENTS
CHEMICAL REACTIONS
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DOPAMINE
DRUGS
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
ELECTRON TRANSFER
ELEMENTS
FERRICYANIDES
FERROCYANIDES
GLASS
HYDROXY COMPOUNDS
IRON COMPLEXES
KINETICS
MATERIALS
NEUROREGULATORS
NONMETALS
ORGANIC COMPOUNDS
PAPER
PHENOLS
POLISHING
POLYPHENOLS
REACTION KINETICS
REDOX REACTIONS
SILICON CARBIDES
SILICON COMPOUNDS
SURFACE FINISHING
SYMPATHOMIMETICS
TRANSITION ELEMENT COMPLEXES
VITAMINS