A kind of bifunctional composite porous membrane and its preparation and application
A porous membrane and dual-function technology, which is applied in the field of composite membrane materials for flow batteries, can solve the problems of poor oxidation resistance and low vanadium permeability, and achieve the effects of solving capacity decay, process environmental protection, and improving selective permeability
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Embodiment 1
[0051] Dissolve 3g of polyetheretherketone in 29.58ml of DMAc. After the sulfonated polyether ether ketone is completely dissolved, add 12g of polyether ether sulfone and stir for 12 hours until a transparent and uniform polymer solution is formed; stop stirring and let it stand for 4 hours. Degassing on a hot stage at a temperature of 40°C. Then the polymer solution was scraped onto the surface of the glass plate with a spatula to form a primary film with a thickness of about 200 μm, which was quickly immersed in 5 L of water and cured to form a porous diaphragm. Soak it in deionized water for 2 hours to prepare a porous membrane matrix with a thickness of about 125-130 μm.
[0052] The prepared porous membrane was cleaned, soaked in ethanol for 2 hours, the water therein was replaced, and placed on a hot stage at 40° C. until a porous membrane with a relatively dry surface was obtained.
[0053] Prepare an aqueous imidazole solution with a concentration of 1.0mol / L, immerse...
Embodiment 2
[0056] Embodiment 2: other conditions are the same, polyethersulfone is replaced by polyether ether ketone.
Embodiment 3
[0057] Embodiment 3: other conditions are the same, polyethersulfone is replaced by polyacrylonitrile.
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