Oxygen exchange on platinum electrodes in zirconia cells; Location of electrochemical reaction sites
- IBM Research Div., San Jose, CA (USA). Almaden Research Center
- California Univ., Berkeley, CA (USA). Dept. of Chemical Engineering
Oxygen exchange kinetics on porous platinum electrodes in a zirconia electrochemical cell were measured at 600{degrees}--800{degrees}C in 10{sup {minus} 5}-0.21 atmospheres oxygen. Steady-state polarization and potential-step chronoamperometric experiments were performed. Steady-state current-voltage characteristics exhibited near-exponential behavior at intermediate potentials and approached anodic and cathodic limiting currents at higher overpotentials. At and below 600{degrees}C, the initial decay of the current following anodic and cathodic potential steps was inversely proportional to the square root of time. This Cottrell-type behavior indicates that the charge-transfer step in the mechanism of oxygen exchange occurs at the three-phase boundary where the electrode, electrolyte, and gas-phase intersect.
- OSTI ID:
- 6817319
- Journal Information:
- Journal of the Electrochemical Society; (USA), Vol. 137:1; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
74 ATOMIC AND MOLECULAR PHYSICS
ELECTRODES
CHARGE TRANSPORT
PLATINUM
ZIRCONIUM OXIDES
ELECTROCHEMICAL CELLS
EXPERIMENTAL DATA
OXYGEN
POLARIZATION
POROUS MATERIALS
STEADY-STATE CONDITIONS
CHALCOGENIDES
DATA
ELEMENTS
INFORMATION
MATERIALS
METALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZIRCONIUM COMPOUNDS
300503* - Fuel Cells- Materials
Components
& Auxiliaries
300505 - Fuel Cells- Electrochemistry
Mass Transfer & Thermodynamics
640302 - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory