Properties of Interface between Platinum Sponge and Solid Electrolyte Na5TbSi4O12in an Oxygen Atmosphere at Moderate Temperatures: Effect of the Platinum Grain Size |
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Authors: | Tkacheva N. S. Leonova L. S. Bukun N. G. |
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Affiliation: | (1) Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia |
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Abstract: | The behavior of electrochemical cells Pt(sponge)/Na5TbSi412/Na0.65Co2(cell I) and Pt(sponge)/Na5TbSi412/Pt(sponge) (cell II) is studied by, respectively, potentiometric and impedance methods in oxygen and argon atmospheres at 50–300°C. Dependence of potential of cell I on the oxygen concentration is affected by the grain size of platinum sponge and the temperature. At 50–200°C the coarse-grained platinum electrode in contact with solid electrolyte Na5TbSi412 exhibits an oxygen function characterized by the potential-determining reaction 2(g) + 2 + 2 = –2 + –. An impedance method shows the triple-phase boundary 2, Pt(sponge)/Na5TbSi412 to be reversible with respect to oxygen. The reversibility is realized by minority charge carriers in the solid electrolyte, i.e. by oxygen ions. |
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