Strengthening mechanism and electrochemical characterization of ZrO₂ nanoparticles in Nickel-Aluminum alloy for Molten Carbonate Fuel Cells

In this work the positive effect of zirconia nanoparticles in Nickel-Aluminum anodes is investigated. Results showed that, as the zirconia content increases, bending strength and creep resistance are improved. Mechanical strength increases from 5.94 to 11.38kg_f cm^-2 and creep is reduced up to 3.31%. Morphology and microstructural analysis revealed that nanoparticles adhere strongly on the surface of larger metal particles and microstructure is strengthened at grain level. The diffusion of Aluminum atoms into different vacancies reduces dislocations movement. A part these mechanisms, charge and mass transfer resistance are lower and the internal resistance after 500h at 650°C is 0.24mΩcm².