Modeling Intermediate Temperature Protonic Ceramic Fuel Cells
The lower cell temperature and hydrogen removal from the anode channel present unique operational features which are considered in the present work. In particular, a thermodynamic analysis is presented for operating regimes where solid carbon formation is not thermodynamically favorable. Simulation results are presented for the operation of the cell over a variety of operational regimes. Model predicted distributions of gas phase species, temperature, and local current density are resolved. The model predicted cell performance when operating on a humidified methane fuel source with steam-to-carbon ratio (S/C) of 2.4 at 500oC and 80% utilization indicates a power density greater than 0.100 W/cm2 is attainable at an average current density of 0.15 A/cm2. Model-predicted cell performance is explored under various operating conditions (Temperature, utilization, S/C) and an evaluation of reactant flow configuration (co- vs. counter-flow) is also presented.