Direct Internal Reforming Characteristics of SOFC with a Thin SASZ Electrolyte and a LNF Cathode

Abstract

Power generation characteristics and internal reforming characteristics of anode-supported solid oxide fuel cells (SOFCs) with a thin scandia-alumina-stabilized zirconia (SASZ) electrolyte and a lanthanum nickel oxide (LNF) cathode were investigated under the condition of low steam/methane ratios or steam/carbon ratios (S/C). Exhaust gas flow rate of and CO increased and the rate of decreased with increasing current density at The ratio of the gas flow rate increase of to CO was approximately constant and no apparent carbon formation on the surface of anode was observed. We calculated the exchange current densities from results of anodic overpotential measurements at and 2.0. The exchange current density at differed from the exchange current density at which was similar to the exchange current density in case of using fuel. These results suggest that the electrochemical reaction in anode at involves the partial oxidation of © 2004 The Electrochemical Society. All rights reserved.