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KMID : 1059519930370070635
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Journal of the Korean Chemical Society
1993 Volume.37 No. 7 p.635 ~ p.641
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Thermodynamic Properties of the Cell Systems made of the Metal and Its Oxide Electrodes
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Rho Kwon-Sun
Lee Eun-Seok
Mayorova Alla F.
Mudrezova Svetlana N.
Yo Chul-Hyun
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Abstract
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Electrochemical cell, Pt│air(PO2 = 5.3×10-3 atm)│Zr0.85Ca0.15O1.85│air(PO2 = 0.21 atm)│Pt, has been designed to characterize the solid electrolyte and the temperature dependence of the electromotive force (EMF) has been measured in a temperature range of 600∼1000℃. Solid electrolyte shows pure ionic conduction of the oxygen anion. The Fe-FexO, Co-CoO, Ni-NiO, and Cu2O-CuO electrodes have been prepared by mixing the 1 : 1 mole ratio of each metal and metal oxide and then by heating at 800℃ for 6 hours. Electrochemical cells, Pt│M(s), MO(s)│Zr0.85Ca0.15O1.85│air(PO2 = 0.21 atm)│Pt, have been designed and the temperature dependence of the EMF has also been measured in the same temperature range. The changes of the thermodynamic state functions for the formation of the metal oxides are calculated from the electromotive forces and their temperature dependences. The material properties of the oxide systems are also discussed with the function changes.
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