NiAl anodes with nano ZrO2 are tested in MCFC single cell after characterization. Results show that nanoparticles improve mechanical and creep properties. The anode with ZrO2 3% wt. has the best performance over 1000 h operations. Post analysis shows zirconates formation at cathode for ZrO2 contents over 5% wt. A high content of nanoparticles can diminish too much porosity and pore size.