Differential impedance analysis of the cathode compartment in dual membrane fuel cell
نویسندگان
چکیده
The cathode/electrolyte LSCF48/YDC15 couple is a building block of a new innovative and competitive design of a high temperature fuel cell, operating in the range between 600 and 700°C. It is based on the idea for a junction between a proton conducting SOFC (PCFC) anode/electrolyte part and a SOFC cathode/electrolyte part through a mixed H and O conducting porous ceramic membrane. Thus, in this concept, hydrogen, oxygen and water are located in three independent chambers, which allows for avoidance of gases dilution with water. The applicability of different technologies (tape casting and plasma spraying) for the cathode deposition is analyzed in this paper using the Differential Impedance Analysis (DIA). A two step reaction mechanism of oxygen reduction is recognized. The ratelimiting step is the transport of oxygen ions in the volume of the electrode towards the electrolyte. A higher degree of frequency dependence is registered for the plasma spraying deposition technology.
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