Application of polybenzimidazole polymer containing side group in proton exchange membrane
A polybenzimidazole and proton exchange membrane technology, which is applied in the parts of fuel cells, solid electrolyte fuel cells, etc., can solve problems such as limited application and reduced proton conductivity, and achieve high doping level, high stability, Effects of high phosphoric acid doping levels and conductivity
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[0031] Example 1: Preparation of polybenzimidazole film containing benzene side groups
[0032] Take 1.0000g of polybenzimidazole polymer containing pendant benzene groups, add 10ml DMSO, stir at room temperature until it is completely dissolved into a homogeneous and transparent brown solution, then pour the solution onto a clean 10cm×10cm glass plate, and Bake at 80°C for 12 hours, 100°C for 12 hours, 120°C for 12 hours, 120°C under vacuum for 24 hours, and cool to room temperature to obtain a transparent polybenzimidazole film.
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[0033] Example 2: Preparation of phosphoric acid doped polybenzimidazole film containing benzene side groups
[0034] The polybenzimidazole film obtained in Example 1 was immersed in a petri dish containing phosphoric acid with a mass concentration of 85%, and phosphoric acid adsorption was performed at a high temperature of 160°C. Set different adsorption time, respectively: 3h, 12h, 36h, 72h, 108h, use filter paper for the removed film (respectively named: ph-3, ph-12, ph-36, ph-72, ph-108) The acid on the surface was wiped off, and then placed in a vacuum oven at 100° C. for 5 hours to obtain polybenzimidazole films with different doping levels (see Table 1).
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[0035] Example 3: Test of the proton conductivity of phosphoric acid doped polybenzimidazole film containing benzene side groups
[0036] A Princeton Applied Research Model 2273 conductivity tester with a model of 2273 was used to test the conductivity of the membrane using a four-electrode method. The test conditions were as follows: AC impedance frequency was 0.1-100 kHz, and amplitude was 10 mV. Test the conductivity of films with different doping levels in the temperature range of 80-200℃.
[0037] The test was carried out under dry conditions. From the five films with different adsorption times obtained in Example 2, a 50mm×10mm rectangular film spline was cut out, and the spline was fixed on the fixture to test its Proton conductivity in the temperature range of 80~200℃, the conductivity of the film with an adsorption time of 108h at 200℃ reaches 0.110S. cm -1 , See figure 1 .
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