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(Proton Exchange Membrane Fuel Cells, PEMFC)       .   sulfonated Poly(ether ether ketone)(sPEEK)  , ,     PEMFC   . I-V , ,  ,        ·.  ,    ,              .Abstract − Recently, there are many efforts focused on development of more economical non-fluorinated membranesfor use in PEMFCs (Proton Exchange Membrane Fuel Cells). In this study, characteristics of sulfonated Poly(ether etherketone) (sPEEK) were compared according to degrees of sulfonation (DS), relative humidity, cell temperatures at PEMFCoperation condition. I-V polarization curve, hydrogen crossover, electrochemical surface area, membrane resistance andcharge transfer resistance were measured. sPEEK membrane showed high performance at high DS, high temperatureand high relative humidity, in particular, performance of sPEEK membrane decreased largely due to low ionic conduc-tivity at low DS and low relative humidity.Key words: PEMFC, sPEEK, Performance, Degrees of sulfonation, Relative Humidity, Cell Temperatures, Ionic Conductivity

Characteristics of Proton Exchange Membrane Fuel Cells(PEMFC) Membrane and Electrode Assembly(MEA) Using Sulfonated Poly(ether ether ketone) Membrane