Abstract
A two-dimensional tubular model of a nickel + yttria-stabilized zirconia electrode supported micro-tubular solid oxide electrolysis cell (SOEC) was developed in order to investigate the temperature distribution during high-temperature steam electrolysis. High-temperature steam electrolysis using SOECs allows for highly efficient hydrogen generation, because the heat from the overpotential can be recycled in the form of a heat source for the electrolysis reaction. In this paper, the numerical model was expanded to unsteady model, and the temperature distribution responses after electric load changes of 0.2 A/cm2 to 0.0 A/cm2, 0.4 A/cm2 to 0.0 A/cm2 and 0.6 A/cm2 to 0.0 A/cm2 were calculated.
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