Composite proton exchang membrane in use for fuel cell and preparation method
A proton exchange membrane and fuel cell technology, applied in the direction of fuel cells, fuel cell parts, battery pack parts, etc., can solve the problems of easy gas blow-by in the reaction of oxygen and hydrogen, adverse effects on fuel cell performance, etc., to achieve good The effect of anti-reactive gas permeability, good durability and good mechanical strength
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Embodiment 1
[0025] The preparation steps of the multi-layer proton exchange membrane are
[0026] 1) Select an expanded polytetrafluoroethylene microporous membrane with an average thickness of 3μm, an average pore diameter of 0.2μm and a porosity greater than 85%, and immerse it in isopropanol for cleaning and swelling. After it is fully dried, use a thin aluminum frame Fasten the membrane;
[0027] 2) Immerse the expanded PTFE microporous membrane into 5wt% Nafion In the resin solution (product of DuPont), take out the film after 20 minutes and place it horizontally on the heating plate to dry, during which time the film is rolled with a rubber roller;
[0028] 3) Repeat step 2 of the rolled membrane twice to prepare a single-layer porous polymer reinforced composite proton exchange membrane;
[0029] 4) Stack 4 porous polymer-reinforced composite proton exchange membranes of the same size prepared in step 3 neatly, and place a PTFE membrane of the same size on the bottom and the upper pa...
Embodiment 2
[0039] The preparation of single-layer PEM is basically the same as in Example 1, except that: the average thickness of the expanded polytetrafluoroethylene microporous membrane used is 5 μm, the average pore diameter is 0.5 μm, and the porosity is greater than 85%; Repeat step 2 for the membrane 3 times. The preparation method of the multi-layer proton exchange membrane is basically the same as that of Example 1, except that the number of layers of the porous polymer-reinforced composite proton exchange membrane in the prepared laminate is 3, and the hot pressing pressure is 2.5 MPa. The test methods of the tensile strength, single cell performance, and accelerated life test of the film are the same as in Example 1. The tensile strengths of the expanded polytetrafluoroethylene microporous membrane, single-layer PEM and multi-layer PEM are 15MPa, 19MPa, and 37MPa, respectively. Table 3 and Table 4 below are the battery performance test and life acceleration test results of the mul...
Embodiment 3
[0045] The preparation method of single-layer PEM is basically the same as that of Example 1, except that the average thickness of the expanded polytetrafluoroethylene microporous membrane used is 10 μm, the average pore diameter is 0.5 μm, and the porosity is greater than 80%; Repeat step 2 for the subsequent film 4 times. The preparation method of the multi-layer proton exchange membrane is basically the same as in Example 1, except that the number of layers of the porous polymer reinforced composite proton exchange membrane in the prepared laminate is 2, and the pressure of the hot pressing is 2.5 MPa. The test methods of the tensile strength, the performance of the single cell and the accelerated life test of the film are the same as those in Example 1. The tensile strengths of the expanded polytetrafluoroethylene microporous membrane, single-layer PEM and multi-layer PEM are 22MPa, 28MPa, and 47MPa, respectively. Table 5 and Table 6 below are the battery performance test and ...
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