Abstract
The cathode fabrication for metal supported solid oxide fuel cell (MS-SOFC) has been considered as a severe problem. In this study tri-layer substrate with structure of Ni-Fe|Ni-Fe-YSZ||YSZ||porous-YSZ is designed for cathode infiltration, with the purpose to avoid the metal substrate being seriously oxidized. The above substrates are prepared through tape-casting, thermal isostatic pressing, high temperature co-sintering and reducing. Then, (La0.6Sr0.4)1-xCo0.2Fe0.8O3-δ (LSCF; x = 0, 0.08) cathodes are infiltrated into the porous YSZ layer with multiple calcinations at 430°C in air. The pre-reduced Ni/Fe substrates show decent oxidation tolerance during the repeated firing processes. Moreover, the infiltrated LSCF cathodes present good perovskite crystalline structure and comparable conductivity of ∼2 S/cm after calcined in air at 750°C, which enables the real industrial application. The A-site deficient (La0.6Sr0.4)0.92Co0.2Fe0.8O3-δ exhibits better polarization resistance performance and stability than the stoichiometric La0.6Sr0.4Co0.2Fe0.8O3-δ which is presumably due to the in-situ formed heterostructure. Furthermore, the evolution process of the polarization resistance, ohmic resistance and the conductivity for the infiltrated LSCF cathodes during long-term annealing at 750°C are discussed in detail.
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