The Preparation And Characterizations Of PAM/starch Gel Matrix High-temperature Proton Exchange Membrane

With the rapid development of global economy and the increasing consumptionof fossil fuels, a growing number of people pay more attention to environmentalprotection, the energy problem is becoming a prime issue to human development.Fuel cells have been widely applied in many fields today. Among these fuel cells,proton exchange membrane fuel cells have become the research focus due to its cleanand efficient characteristics. In numerous proton exchange membrane fuel cells, thehigh temperature proton exchange membrane fuel cells have a broad prospectbecause of its distinctive merits. Therefore, it is of great significance to optimize theproperties and analyze its morphology structure and further study on the influence ofdoping on the structure and preperties. The working temperature of high temperatureproton exchange membrane fuel cell is between100℃and200℃, which it’schemical reaction kinetics are faster, compared with the low temperature fuelcells(working temperature is usually lower than80℃); It simplifies watermanagement system, and is more efficient on thermal management and has betterenvironmental tolerance, these advantages ensure that high temperature protonexchange membrane fuel cell is considered as the next generation of fuel cells.Here we employed starch and acrylamide as reactants by a solutionpolymerization method to produce the graft copolymerization polyacrylamide/starchgel proton exchange membrane, which can be operated at high temperature. FTIRconsequences revealled that the molecule structure of the proton exchange membranewas three-dimensional network structure, this characteristic gave membrane theexcellent ability of adsorption and retaining phosphate acid. Moreover, the experimentis easy to operate and has low cost.The phosphoric acid loading can be adjusted by changing the dosages of starch, initiator and crosslinker. Here we discussed the best dosage of starch, initiator andcrosslinker, the results show that when the dosage of starch was0.2g, phosphateloading was88.68wt%, and the proton conductivity can reach0.085s·cm-1at180℃;when the dosage of initiator was0.30wt%, phosphate loading could be up to91.2wt%and the proton conductivity was0.088s·cm-1at180℃; when the amount ofcrosslinker was0.10wt%and phosphate loading was87.5wt%, the protonconductivity was0.109S cm-1at180℃.Through testing the high temperature stability performance ofpolyacrylamide/starch gel proton exchange membrane over100℃, the results claimedproton conductivities can remain stable for a long time and ensure the conductivity inactual applications; And electro-chemical testing confirmed that thepolyacrylamide/starch gel proton exchange membrane can transform protonssequentially and be used in batteries...