High temperature oxygen transport and electrochemical behavior of YBa[sub 2]Cu[sub 3]O[sub x]

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2220751· OSTI ID:6249976

Guer, T M ^[1]; Huggins, R A ^[2]

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1. Stanford Univ., CA (United States). Dept. of Materials Science and Engineering
2. Zentrum fuer Sonnenenergie- und Wasserstoff-Forschung, Ulm (Germany)

Over the last several decades, solid oxide electrolytes based on stabilized zirconia have found extensive use in applications such as oxygen sensors, solid oxide fuel cells, oxygen pumps, electrocatalytic reactors, and electrochemically driven oxygen separation membranes. In this preliminary study, the high temperature oxygen transport and electrochemical behavior of YBa[sub 2]Cu[sub 3]O[sub x] was evaluated in a solid-state electrochemical cell employing a yttria-stabilized zirconia (YSZ) solid electrolyte. The oxygen chemical diffusion coefficient was measured by a solid-state potentiostatic step technique and found to be 5 x 10[sup [minus]8] cm[sup 2]/s at 800 C. The dc polarization behavior of YBa[sub 2]Cu[sub 3]O[sub x] electrodes deposited on YSZ electrolyte was governed primarily by an ohmic process in oxygen, air, and He environments in both the anodic and cathodic directions. The frequency dispersion of the electrochemical response, obtained by ac impedance spectroscopy showed two depressed circular arcs in complex plane plots that are offset from the origin, indicative of a resistive path in the equivalent circuit model at high frequencies. It is proposed that the YBa[sub 2]Cu[sub 3]O[sub x] electrode poses the major impedance to the overall rate and dominates the electrochemical performance of the cell.

• OSTI ID: 6249976
• Journal Information: Journal of the Electrochemical Society; (United States), Vol. 140:7; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
30 DIRECT ENERGY CONVERSION
BARIUM OXIDES
ELECTROCHEMISTRY
COPPER OXIDES
SOLID ELECTROLYTE FUEL CELLS
ELECTRODES
YTTRIUM OXIDES
BATTERY SEPARATORS
DIFFUSION
ELECTROCATALYSTS
IMPEDANCE
MASS TRANSFER
OXYGEN
SPECTROSCOPY
ZIRCONIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CATALYSTS
CHALCOGENIDES
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COPPER COMPOUNDS
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELEMENTS
FUEL CELLS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
400400* - Electrochemistry
300503 - Fuel Cells- Materials
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