Fabrication and cell performance of anode-supported SOFC made of in-house produced NiO-YSZ nano- composite powder

摘要

The cell performance of anode-supported SOFCs fabricated from in-house produced NiO- YSZ nanopowder was investigated. NiO-YSZ nanopowder was fabricated via a single-step modified sol-gel method using sucrose and pectin as organic precursors. The obtained nanopowder was characterized by TEM and XRD measurements. The powder was then pressed into pellets in a uniaxial press and pre-sintered to be used as supports. Thin 8 mol% yttria-stabilized zirconia (8YSZ) electrolyte films (～15 μm) were obtained by a dip- coating process from ethanol suspensions using phosphate ester (PE) and polyvinyl butyral (PVB) as dispersant and binder, respectively, followed by a co-sintering step. The microstructure of the obtained films was characterized by SEM. Dense electrolyte films were obtained on anode supports which undergo a relative linear shrinkage of 23% during co-sintering. LSM-YSZ paste was then screen-printed on the 8YSZ electrolyte/anode followed by a screen-printed layer of pure LSM to form a cathode comprising an active layer and a backing layer to assemble a single fuel cell. The cell performance was tested in the temperature range of 700-1000oC