AC spectroscopic study of charge transfer across a single interface between ZnO and YSZ
In this study, the electrochemical behavior of a simple interface between a single crystal of zinc oxide (ZnO) and a single crystal of yttria-stabilized zirconium dioxide (YSZ) was investigated using small-signal ac immittance spectroscopy (ACIS). From the total cell immittance data, acquired as a function of frequency over a range of temperatures (200C {le} T {le} 900C), partial pressures of oxygen (10{sup {minus}4}-1 atm.) and dc bias voltage, the physical processes that play a role in the charge transport were identified. A simple equivalent circuit that best represents the data and is consistent with the physical model has been assigned for the system under investigation. The equivalent circuit parameters values were obtained using a data analysis program, called CPFMULIT, developed for this work. In all, five semicircular relaxations were observed and each of these relaxations has been associated with a physical process. At the lowest temperature range the total impedence of the cell was found to be dominated by the bulk ionic resistance of YSZ. The effects of chemisorption of oxygen on ZnO surface were observed at 275C-450C.
- Research Organization:
- Marquette Univ., Milwaukee, WI (United States)
- OSTI ID:
- 7041243
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
25 ENERGY STORAGE
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTROLYTES
ENERGY TRANSFER
INTERFACES
TEMPERATURE RANGE 0400-1000 K
ZINC OXIDES
ZIRCONIUM OXIDES
CHALCOGENIDES
OXIDES
OXYGEN COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
ZIRCONIUM COMPOUNDS
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