Oxygen reduction on a graphite paste and a catalyst loaded graphite paste electrode

Technical Report · Sat Mar 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/5709998· OSTI ID:5709998

DiMarco, D. M.

Oxygen reduction was studied in basic solution at a graphite paste electrode (GPE). The GPE was used as the disk of a rotating ring disk electrode (RRDE) and experiments were done using the voltage scan technique. The enhancements afforded by catalysts applied to the GPE were also studied. Oxygen reduction on a GPE was shown to be a two-electron process resulting in the formation of peroxide. The Tafel slope (plotted as potential versus log(i/sub l/ x i/(i/sub l/ - i))) was 180 mV. The presence of gold, silver, or platinum on the GPE shifted the oxygen reduction wave approximately 800 mV in the anodic direction. Comparison of the data on a metal catalyzed GPE to the solid metal electrode showed that the former electrode produced a greater fraction of peroxide as product than did the latter. Silver and gold catalyzed GPEs gave Tagel slopes of about 120 mV. The intermediate catalysis of iron and cobalt porphyrin was also examined. While the cobalt porphyrin catalyzed oxygen reduction at a more anodic potential than the iron porphyrin, the latter appeared more active in reacting the peroxide formed as the product of the disk reaction.

• Research Organization: Ames Lab., Ames, IA (United States)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5709998
• Report Number(s): IS-T-886
• Resource Relation: Other Information: Thesis
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
OXYGEN
REDUCTION
CATALYSIS
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
COBALT COMPLEXES
ELECTRODES
GOLD
GRAPHITE
IRON COMPLEXES
PEROXIDES
PLATINUM
PORPHYRINS
ROTATION
SILVER
CARBON
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COMPLEXES
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
KINETICS
METALS
MOTION
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PLATINUM METALS
REACTION KINETICS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
YIELDS
400400* - Electrochemistry