Electrocatalysis of anodic and cathodic oxygen-transfer reactions
The electrocatalysis of oxygen-transfer reactions is discussed in two parts. In Part I, the reduction of iodate (IO{sub 3}{sup {minus}}) is examined as an example of cathodic oxygen transfer. On oxide-covered Pt electrodes (PtO), a large cathodic current is observed in the presence of IO{sub 3}{sup {minus}} to coincide with the reduction of PtO. The total cathodic charge exceeds the amount required for reduction of PtO and IO{sub 3}{sup {minus}} to produce an adsorbed product. An electrocatalytic link between reduction of IO{sub 3}{sup {minus}} and reduction of PtO is indicated. In addition, on oxide-free Pt electrodes, the reduction of IO{sub 3}{sup {minus}} is determined to be sensitive to surface treatment. The electrocatalytic oxidation of CN{sup {minus}} is presented as an example of anodic oxygen transfer in Part II. The voltametric response of CN{sup {minus}} is virtually nonexistent at PbO{sub 2} electrodes. The response is significantly improved by doping PbO{sub 2} with Cu. Cyanide is also oxidized effectively at CuO-film electrodes. Copper is concluded to serve as an adsorption site for CN{sup {minus}}. It is proposed that an oxygen tunneling mechanism comparable to electron tunneling does not occur at the electrode-solution interface. The adsorption of CN{sup {minus}} is therefore considered to be a necessary prerequisite for oxygen transfer. 201 refs., 23 figs., 2 tabs.
- Research Organization:
- Ames Lab., IA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6764798
- Report Number(s):
- IS-T-1450; ON: DE91000611
- Country of Publication:
- United States
- Language:
- English
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Electrocatalysis of anodic, oxygen-transfer reactions at noble metal electrodes
Electrocatalysis of anodic, oxygen-transfer reactions at noble metal electrodes
Related Subjects
400201 -- Chemical & Physicochemical Properties
400400* -- Electrochemistry
ADSORPTION
ANODES
CATALYSTS
CATHODES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
CYANIDES
ELECTROCATALYSTS
ELECTRODES
HALOGEN COMPOUNDS
IODINE COMPOUNDS
IODINE OXIDES
KINETICS
LEAD COMPOUNDS
LEAD OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM COMPOUNDS
PLATINUM OXIDES
REACTION KINETICS
REDUCTION
SORPTION
SURFACE TREATMENTS
TRANSITION ELEMENT COMPOUNDS