Studies on electrode processes of stabilized zirconia cell system by complex impedance method.
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概要
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Three kinds of materials, Pt, Ag, and La<SUB>0.5</SUB>Sr<SUB>0.5</SUB>CoO<SUB>3</SUB>, were applied to stabilized zirconia as electrodes and the electrode behavior was investigated by means of the complex impedance method. The impedance arc due to the electrode/stabilized zirconia interface was always depressed semi-circles. Impedance behavior was strongly dependent on the electrode materials. Assuming that the impedance arc could be interpreted by a parallel <I>R</I>-<I>C</I> circuit, the interface resistance <I>R</I><SUB>i</SUB> and the interface capacitance <I>C</I><SUB>i</SUB> were determined. The apparent activation energy determined from the slope of the plots of log<I>R</I><SUB>i</SUB> <I>vs.</I> 1/<I>T</I> was nearly the same for the same electrode material. (Ag electrode: 92 kJ/mol and Pt electrode: 201 kJ/mol). The oxygen pressure dependence of <I>C</I><SUB>i</SUB> and <I>R</I><SUB>i</SUB> was also investigated. Although <I>C</I><SUB>i</SUB> was virtually independent of the oxygen partial pressure <I>P</I><SUB>O<SUB>2</SUB></SUB>, <I>R</I><SUB>i</SUB> was proportional to <I>P</I><SUB>O<SUB>2</SUB></SUB><SUP>−2⁄3</SUP> for Ag electrodes and <I>P</I><SUB>O<SUB>2</SUB></SUB><SUP>−1⁄4</SUP> for Pt electrodes. The rate-determining step was supposed to be the dissociation of oxygen molecules into atoms for Ag electrodes, and the dissociation of oxygen molecules or one of the subsequent steps for Pt electrodes.
- 公益社団法人 日本化学会の論文
著者
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Yamauchi Shigeru
Department Of Industrial Chemistry Faculty Of Engineering The University Of Tokyo
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Fueki Kazuo
Department Of Industrial Chemisrty Faculty Of Science And Technology Science University Of Tokyo
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Mizusaki Junichiro
Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo
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Sasaki Jun
Department Of Applied Biological Science Tokyo University Of Agriculture And Technology
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Yamauchi Shigeru
Department of Chemistry, Faculty of Science, The University of Tokyo
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