Solid oxide fuel cells (SOFC) 27 SOFC 12 Technology: general issues 11 Solid-oxide fuel cell 10 Fuel cell system 7 Solid electrolytes 7 Cathodes 6 Electrochemical performance 5 Electrodes 5 Sintering 5 Area-specific resistances 4 Lanthanum compounds 4 Oxygen 4 Physics 4 Research & information: general 4 Solid-oxide cells 4 Strontium compounds 4 Barium compounds 3 Cerium oxide 3 Deposition 3 Electrolysis 3 History of engineering and technology 3 Kalman filters 3 Performance 3 Yttria stabilized zirconia 3 Yttria-stabilized zirconia electrolyte 3 Yttrium oxide 3 Activation energy 2 Additives 2 Anodes 2