Kamis, April 02, 2009

Research

THE INFLUENCE OF RATIO POLYSULFON/POLY(EUGENOL SULFONAT) TO CHARACTERS OF ELECTROLYTE POLYMER MEMBRANE OF FUEL CELL

ABSTRACT
The influence of polysulfon/poly(eugenol sulfonat) ratio to characters of electrolyte polymer membrane for fuel cell was studied. Synthesis of poly(eugenol sulfonat) (PES) was carried out by sulfonation and polimerisation of eugenol using lead(II)sulphate (PbSO4) catalyst. Synthesis of membrane was performed by blending polysulfon (PSF) + PES at weight rasio PSF/PES : 4/0 (A membrane), 3/1 (B membrane), 1/1 (C membrane) dan 1/3 (D membrane). The solvent used was Dimethyl Sulfooxide (DMSO). The liquid membrane was then changed to thin solid and dried in vacum condition at temperature 80 oC.
The surface of membrane was analyzed by optical microscope at 1000 magnification. Physical and chemical characterisations of membrane include proton conductivity, percentage of water uptake, oxydative stability, thermal stability and crystalinity of membrane was investigated. Proton conductivity was determined using V-I methode at temperatur 30 oC and relative humidity of 100 %. The water uptake test was calculated by difference mass of humidified and dryed membrane at temperature 30 oC and relatif humidity of 100 % . The oxydative stability test was performed by immersing membrane into fenton reagent. The thermal stability of membrane was analyzed by Differential Thermal Analysis (DTA) and membrane crystalinity was identified by X-Ray Diffraction (X-RD).
The surface analysis indicated that distribution of matrix in the membrane was homogen. The proton conductivity test showed that the conductivity increased when humidity was increased. The percentage of water uptake and proton conductivity increased together with decreasing PSF/PES rasio. The value of proton conductivity at orde 10-8-10-6 S/cm. The oxydative stability test indicated that all of membranes stable in the oxydative environment. Generally, thermogram of DTA indicated that geometry structure of membranes changed at temperature of 155-170 oC and desomposition of SOx were observed at 220-325 oC. The X-RD data showed that the crystalinity of all membranes were amorf. The result showed the best performance membrane was D membrane which has the highest proton conductivity (10-6 S/cm) and water uptake (144,19 %) with good thermal stability (225,85 oC) for application.


Key words : fuel cell, sulfonation, conductivity, proton, membrane.

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