The Study on Modification and Application Performance of Perfluorosulfonated Acid Membrane
|School||Beijing University of Chemical Technology|
|Course||Materials Science and Engineering|
|Keywords||Perfluorinated sulfonic acid membrane modification application electrochemistry performance|
Perfluorinated ion exchange membrane consists of a polytetrafluoroethylene backbone and regular spaced long perfluorovinyl ether pendant side chain terminated by a sulfonate ionic group. Due to the excellent properties such as elelectrochemistry property、thermostability and chemical stability, not only used in proton exchange fuel cell but also in membrane auxiliary electrolysis technology and desalination.In this paper, a direct methanol mixed-reactant fuel cell (DMRFC) single cell with PtRu/C cathode, Pt/C anode and a polypropylene membrane infused Nafion solution as the separator is prepared. The characteristics of the polarization and power for the single cell and the effect of content and distributing of polytetrafluoroethylene (PTFE) and Nafion for cathode at the same time the kind of oxidant on its performance are investigated. The discharge performance of the cell is also investigated. The results show that the steady-state output current density was 5mA·cm-2 at 0.1 Vfor MEA and the maximum power density of single cell is about 0.55mW·cm-2.In this paper, the preparation of perfluorinated sulfonic acid membrane reinforced by PTFE mesh cloth and surface modification coating process were studied, and these membrane have been applid in membrane assisted electrolysis, it was found that product yield and current efficiency of the entire system are superior to PE out-phase membrane when anode reactant is NaOH solution dealed by filtration.In this paper, perfluorinated sulfonic acid ion-exchange (PSAI) membrane and carbon black doped PSAI membrane, which were prepared by solution casting method, has been used to deal with high concentration NaCl solution. The proton conductivity of two kinds of membranes were investigated by AC impedance and the structure property was studied by XRD and SEM. The effects of different potential volumetric flow rate and kind of membrane on the electrosorption performance were investigated in this study. The result show that the method which use of doping carbon membrane instead of conventional ion-exchange membrane could makes the adsorption properties of stability, and improves the adsorption capacity.