Double layer capacitance of porous platinum electrodes in zirconia electrochemical cells

Journal Article · Wed May 01 04:00:00 EDT 1991 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2085814· OSTI ID:5778238

Robertson, N L; Michaels, J N ^[1]

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1. Dept. of Chemical Engineering, Univ. of California, Berkeley, CA (US)

This paper reports on the capacitance of the double layer at the interface between porous platinum electrodes and yttria-stabilized zirconia measured by potential step chronoampermetry. The capacitance is independent of oxygen partial pressure and electrode potential and increases from 0.2 {mu}F/cm{sup 2} at 555{degrees}C to 1.3 {mu}F/cm{sup 2} at 695{degrees}C. These value are at least an order of magnitude smaller than capacitances extracted from the low-frequency portion of ac impedance spectra. This indicates that the capacitive behavior of platinum electrodes in zirconia cells is dominated by time-dependent faradaic processes.

• OSTI ID: 5778238
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 138:5; ISSN 0013-4651; ISSN JESOA
• Country of Publication: United States
• Language: English

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ALLOYS
CAPACITANCE
CHALCOGENIDES
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
FARADAY LAWS
IMPEDANCE
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METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
POROUS MATERIALS
TESTING
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM ADDITIONS
YTTRIUM ALLOYS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES