Development of a multilayer anode for solid oxide fuel cells

In order to develop a high performance multilayer Ni/YSZ-cermet anode with improved long term stability, different NiO/YSZ-composites varying in NiO content and NiO/YSZ particle size ratio have been investigated with respect to their porosity and the coefficient of thermal expansion (CTE) in the oxidized and reduced state. The CTE values showed a dependence on particle sizes of the different NiO and YSZ qualities. The anode/electrolyte interface was realized by screen printing a thin anode (<10 μm) onto electrolyte green tapes, followed by a co-sintering step. Single cell tests showed a lower polarization resistance of the new anode structure due to the enhanced interlocking of anode and electrolyte.