To improve the performance of molten carbonate fuel cells(MCFC)

single cells were tested by electrochemical impedance spectrum(EIS).Moreover

the ZSimpWin software was used for EIS fitting and analysis.The results show that

the performance of the membrane using water as the solvent was equivalent to that using n-butanol as the solvent.Compared to Ni electrode with steel support

the pure Ni electrode's performance has been improved

which was mainly due to the reduction in the charge transfer resistance of cathode and anode

and an increase in effective contacting area between the anode and electrolyte.When the single cell's area increased from 90cm2 to 225cm2

its Warburg impedance was increased by36%.Therefore

improving the transportation performance of the fuel and oxidizer is one of the key points in large cell area development.