A one-dimensional model has been developed to predict the thermal and electrochemical behavior of a high-temperature steam electrolysis stack. This electrolyzer model allows for the determination of the average Nernst potential, cell operating voltage, gas outlet temperatures, and electrolyzer efficiency for any specified inlet gas flow rates, current density, cell active area, and external heat loss or gain. The model includes a temperature-dependent area-specific resistance (ASR) that accounts for the significant increase in electrolyte ionic conductivity that occurs with increasing temperature. Model predictions are shown to compare favorably with results obtained from a fully 3-D computational fluid dynamics model. The one-dimensional model was also employed to demonstrate the expected trends in electrolyzer performance over a range of operating conditions including isothermal, adiabatic, constant steam utilization, constant flow rate, and the effects of operating temperature.

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O’Brien
J. E.
,
Stoots
C. M.
,
Herring
J. S.
,
Lessing
P. A.
,
Hartvigsen
J. J.
, and
Elangovan
S.
, “
Performance Measurements of Solid-Oxide Electrolysis Cells for Hydrogen Production from Nuclear Energy
,”
Journal of Fuel Cell Science and Technology
, Vol.
3
, August
2005
, pp.
72
82
.
4.
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