Abstract
The correlation between microstructure and performance of La0.75Sr0.25Cr0.5Mn0.5O3 - Gd0.2Ce0.8Ox (LSCM-GDC) solid oxide fuel cell (SOFC) anode is investigated. The fuel electrode is fabricated with the nano-composite powder prepared through colloidal-processing-based approach. The well dispersed nano-powder results in the limited particle coarsening during sintering and fine electrode microstructure. The influences of sintering temperature and electrode thickness on polarization resistance are investigated. The lowered sintering temperature results in particle size below 100 nm, which improves electrochemical performance. On the other hand, porosity over 57% inhibits percolation of the solid phases, in particular the LSCM. The performance of thinner composite electrode is superior, which is in good agreement with the deteriorated LSCM and GDC percolations. The electrochemical performance of the optimized electrode is competitive to the conventional Ni-YSZ, Ni-GDC, and LSCM-GDC anodes fabricated with submicron powders.
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