Patent ID: 6492051
Filing Date: 2002-12-10
Classification: H01M,Y02E

Abstract:
A tubular, solid electrolyte electrochemical fuel cell which can operate at temperatures of about 800Â° C. to 1000Â° C. which comprises:a first tubular air electrode consisting essentially of a cerium and calcium doped LaMnO3 material; a solid, tubular electrolyte consisting essentially of stabilized zirconia, disposed on a first portion of the air electrode; a tubular fuel electrode consisting essentially of a cermet material disposed on a portion of the solid electrolyte; and a tubular sintered discrete interlayer disposed between and contacting the electrolyte and air electrode, the interlayer consisting essentially of at least a two-phase mixture of: (1) 20 wt. % to 80 wt. % of a material selected from the group consisting of scandia stabilized zirconia particles, yttria stabilized zirconia particles, doped cerium oxide particles, and mixtures thereof, having a particle size in the range of 0.5 micrometer to 5 micrometers; and (2) 20 wt. % to 80 wt. % of a material selected from the group consisting of doped lanthanum manganite particles, doped lanthanum chromite particles and platinum particles, having a particle size in the range of 1 micrometer to 5 micrometers; where at least 50 wt. % of the particles in the interlayer are less than 3 micrometers, and the sintered interlayer has a thickness of 15 micrometers to 40 micrometers and a porosity between about 5% to 50%.