Abstract
The energy storage efficiency of a Solid Oxide Fuel Cell and Solid Oxide Electrolysis Cell (SOFC/SOEC) reversible system was calculated. The energy storage efficiency for the SOEC mode was estimated to reach 94%-HHV. Additionally, when the system was combined with a Mg-based metal hydride, endothermic heat for water vaporization in the SOEC mode and exhaust heat in the SOFC mode can be managed efficiently to encourage the Mgbased metal hydride to absorb and desorb hydrogen gas in the reversible system. This reveals that the SOFC/SOEC is a promising system without a significant energy loss in storing energy. In addition to the numerical simulations on the energy storage performance for the SOFC/SOEC system, the I-V characteristics of a button-size anode-supported cell were also evaluated. In contrast to the SOFC mode, a larger overvoltage was observed in the SOEC mode at a high current density over 0.6 A cm-2, which was possibly caused by insufficient supply of steam. The condition of such a large overvoltage would damage the cell and indeed we found some cracks at the 8YSZ-electrolyte part after the test.
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