Optimization of SOC electrodes performance for fuel cell and co-electrolysis operation

Reference	Presenter	Authors (Institution)	Abstract
06-227	Mihails Kusnezoff	Kusnezoff, M.(Fraunhofer Institute for Ceramic Technologies and Systems); Trofimenko, N.(Fraunhofer Institute for Ceramic Technologies and Systems); Megel, S.(Fraunhofer Institute for Ceramic Technologies and Systems); Michaelis, A.(Fraunhofer IKTS);	The efficient high temperature electrolysis is of high interest for potential application in a renewable energy system. The possibility to use high temperature heat for the electrolysis reaction makes the SOEC technology an attractive option for the integration in process concepts for the production of valuable chemicals from renewable energies. Moreover, the SOEC allows for the electrolysis of water and carbon dioxide in a so-called co-electrolysis. While the co-electrolysis is more complicated than steam electrolysis, the electrochemical performance of electrolyte supported cell with LSMM’/ScSZ and Ni/GDC electrodes were investigated over a wide range of operating conditions (SOEC as well as SOFC), varying the ratio of H2O:H2 and CO2:CO, the operating temperature (750–850°C) and current density. The fuel and air electrodes were modified for long term stable SOFC and SOEC operation. Improved cell was successfully tested for ~2400 hours at 803°C under co-electrolysis conditions (H2/H2O/CO2/CO mixture as fuel, j = -400 mA/cm2).
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