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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Institution: | (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)/Na5TbSi4 12/Na0.65Co 2(cell I) and Pt(sponge)/Na5TbSi4 12/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 Na5TbSi4 12 exhibits an oxygen function characterized by the potential-determining reaction 2(g) + 2 + 2 = ![Ncy](/content/p7593754g442m450/xxlarge1053.gif) –
2 + ![Ocy](/content/p7593754g442m450/xxlarge1054.gif) –. An impedance method shows the triple-phase boundary 2, Pt(sponge)/Na5TbSi4 12 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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