Electrochemical Impedance Spectroscopy of Liquid Tin Anode Solid Oxide Fuel Cell

Solid oxide fuel cells (SOFCs) can convert the chemical energy stored in hydrocarbon fuels directly into electricity bypassing the many energy transfers that normally occur, (chemical -> heat (steam boiler)-> mechanical (turbine)-> electrical (generator)), when hydrocarbon fuels are combusted to produce electricity. CellTech Power has developed a liquid tin anode (LTA) SOFC that is not damaged by fuels that contain sulfur. This paper develops an analytical electrochemical impedance spectroscopy model from first principals for the the LTA-SOFC anode half cell. The model is in conjunction with experimental data to determine; the average Ohmic resistance, 8.81m Omega, average steady state concentration of tin oxide in liquid tin, 1.09E-9 mol/cm(3), effective diffusion coefficient of tin oxide through liquid tin, 0.198 cm(2)/s, and the pre-exponential factor for the butler volmer equation 2.92E5 C*cm/mol/s.