Preparation and complex impedance analysis of functionally gradient PEN for MOLB-type SOFC by plasma spraying digital forming

The technology integrated the FGM design theory, the plasma spray, robot digital forming and rapid prototyping was presented.On the help of the functionally graded power feed device, the PEN was prepared continually, which was the core components of MOLB (mono-block layer built) type solid oxide fuel cell (SOFC).The variation of the elements, microstructure of PEN and porosity of electrodes were analyzed using E-probe and energy spectrum analysis.The electrical conductivity of composite electrode was also analyzed by the AC complex impedance technology.The results indicate that this method is successfully used into preparing the functionally gradient PEN including electrodes with high porous and gradient layers that ingredient and organization continuously vary.As a comparison, the match of components in the thermal expansion and other performance is enhanced, and the porosity and the porosity distribution are also improved.Moreover, the interface resistances between the electrodes and electrolyte sharply decrease than the PEN without the gradient layers, which is the advantage of improving the electrical performance of SOFC