Study On The Properties Of Perfluorosulfonated Ionomer Membranes For Fuel Cell

Proton exchange membrane(PEM) is one of the key components of proton exchange membrane fuel cell(PEMFC). There are deep concerns on developing homemade perfluorosulfonated ionomer(PFSI) membranes, increasing the performance and reducing the cost of membranes. The work in this thesis focus on the three aspects mentioned above, i.e. the homogeneous membrane, the PFSI/polytetrafluoroethylene(PTFE) and the PFSI/PTFE composite membrane filled with silicon dioxide were prepared with domestic perfluorosulfonated ionomer resins, and the functions of lowering cost, reinforcing the strength and humidity of membrane in high temperature were acquired.The homogeneous membranes were synthesized by solution-casting 6 kinds of domestic PFSI resins. The IEC(Ion-Exchange Capacity), water content, dehydrating rate, conductivity, the hydrophilicity of membrane surface, mechanical property and the performance of fuel cell at 60 ℃ were measured. The results show that water content and swelling degree of membrane will increase with the enhancement of IEC (Ion exchange capacity). Two membranes with proper value of IEC, water content and...