MEA für Hochtemperaturbrennstoffzellen mit hoher Leistung

Slide presentation. By using advanced MEA (membrane electrode assembly) technologies IKTS (Fraunhofer Institute for Ceramic Technologies and Systems) produces advanced solid oxide fuel cells with good electrochemical performance. Three systems are described and compared, ESC (electrolyte supported cell with arrangement thick solid electrolyte of 90 µm - 150 µm/thin anode), ASC (anode supported cell with arrangement thin solid electrolyte 5 µm - 20 µm/thick anode), and MSC (metal supported cell with arrangement thin solid electrolyte 5 µm - 20/thin anode/thick porous CrFe alloy). After a brief description of coating and sintering manufacturing methods, the electrochemical performance of different advanced IKTS cells is compared with respect to power density, sulfur tolerance, and stabilit y, using 10ScSZ (10 % scandia-stabilised zirconia), YbSZ (ytterbium-stabilised zirconia) and 3YSZ (3 % yttria-stabilised zirconia) electrolytes, and Ni/8YSZ and Ni/GDC (gadolinia-doped ceria) anodes. ESCs which are commercially available already exhibited tolerance to redox cycling and fuel sulfur, best longterm stability chances, moderate power density, and low ASR (area specific resistance). ASCs also commercially available exhibited poor sulfur and moderate redox cycling tolerance, good chances for longterm stability, and lowest ASR. MSCs which are not commercially available exhibited redox stability and rapid thermal cycling, no sulfur tolerance, moderate longterm stability potential, and low ASR potential.