Abstract
The anodic and cathodic polarization dependences for the oxygen electrode based on lanthanum-strontium manganite and the fuel Ni-cermet electrode are studied in the temperature range of 700–900°С in gas media that correspond to working conditions of a reversible fuel cell. The temporal behavior of these electrodes is studied in the course of periodic polarity changes of current with the density of 0.5 A/cm2. The electrode overvoltage is shown to be about 0.1 V in modes of power generation and water electrolysis at 900°С and the current density of 0.5 A/cm2. A single electrolyte supported tubular solid-oxide fuel cell was fabricated and tested in the fuel-cell and hydrogen-generation modes. It is found that at 900°С and overvoltage of 0.7 V, the cell generates the specific electric power of 0.4 W/cm2 when the 50% H2 + 50% H2O gas mixture is used as the fuel and air is used as the oxidizer. At the water electrolysis with the current density of 0.5 A/cm2, which under normal conditions corresponds to generation of about 0.2 and 0.1 L/h of hydrogen and oxygen, respectively, the consumed power is about 0.55 W/cm2. The efficiency of the conversion cycle electric power–hydrogen–electric power is 70–75%.
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Original Russian Text © D.A. Osinkin, N.M. Bogdanovich, S.M. Beresnev, E.Yu. Pikalova, D.I. Bronin, Yu.P. Zaikov, 2018, published in Elektrokhimiya, 2018, Vol. 54, No. 8, pp. 740–746.
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Osinkin, D.A., Bogdanovich, N.M., Beresnev, S.M. et al. Reversible Solid Oxide Fuel Cell for Power Accumulation and Generation. Russ J Electrochem 54, 644–649 (2018). https://doi.org/10.1134/S1023193518080050
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DOI: https://doi.org/10.1134/S1023193518080050