Composite proton exchange membrane and preparation method thereof
A technology of proton exchange membrane and dry membrane, which is applied in the field of fuel cells, can solve the problems of insufficient flexibility, mechanical properties and thermal stability, etc., and achieve the effects of good proton conductivity, improved proton conductivity, and improved dispersibility
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[0018] A method for preparing a composite proton exchange membrane includes:
[0019] According to the mass ratio of zirconia sulfide coated carbon nanotubes and chitosan of 0.1-10:100, prepare zirconia sulfide coated carbon nanotubes and chitosan respectively. Among them, prepared chitosan is made into an acidic solution of chitosan.
[0020] Zirconium sulfide coated carbon nanotubes can be prepared by the following methods:
[0021] Add every 1g of carbon nanotubes to every 50-100mL of acid solution and mix them evenly. Perform oxidation treatment at 20~120℃ for 1~8h and then cool down. Cool to 20~25℃ for convenience deal with. Filtering, washing with water to neutrality and drying at a temperature of 60-100° C. are performed in sequence to obtain acid-oxidized carbon nanotubes. By using acid to oxidize carbon nanotubes, oxygen-containing functional groups are introduced on the surface of carbon nanotubes. While improving the hydrophilicity of carbon nanotubes, the oxygen-contai...
Example Embodiment
[0052] Example 1
[0053] According to the mass ratio of zirconia sulfide coated carbon nanotubes to chitosan of 0.1:100, a composite proton exchange membrane was prepared.
[0054] Take 1g of carbon nanotubes in 60mL of concentrated nitric acid and oxidize them at 30℃ for 7 hours, then cool to 20℃, filter, wash with deionized water to neutrality, and dry at 60℃ to obtain acid oxidation Carbon nanotubes. Mix the acid-oxidized carbon nanotubes and 0.2mol / L zirconium oxychloride aqueous solution, add ammonia water dropwise to adjust the pH value between 9-10, stir for 24h, filter, and wash with deionized water to neutral. Dry at a temperature of 80°C to obtain an initial sample. The initial sample was added to a 0.5mol / L sulfuric acid solution, stirred for 1 hour at 200 rpm, filtered, washed with deionized water to neutrality, dried at 80°C, and calcined at 620°C for 1 hour to obtain Carbon nanotubes coated with zirconia sulfide.
[0055] Put 0.7g of chitosan with a molecular weigh...
Example Embodiment
[0058] Example 2
[0059] The composite proton exchange membrane was prepared according to the mass ratio of zirconia sulfide coated carbon nanotubes to chitosan of 0.5:100.
[0060] Take 1g of carbon nanotubes in 70mL of concentrated nitric acid and oxidize at 40℃ for 6h, then cool to 25℃, filter, wash with deionized water to neutrality, and dry at 60℃ to obtain acid oxidation Carbon nanotubes. Mix acid-oxidized carbon nanotubes with 0.2mol / L zirconium oxychloride aqueous solution, add ammonia water dropwise to adjust the pH value between 9-10, stir for 26h, filter, and wash with deionized water to neutrality. Dry at a temperature of 85°C to obtain an initial sample. Add the initial sample to a 0.5mol / L sulfuric acid solution, stir for 1.5h at 200rpm, filter, wash with deionized water to neutral, dry at 85℃, and calcinate at 600℃ for 1.5h , To obtain carbon nanotubes coated with zirconia sulfide.
[0061] Put 0.7g of chitosan with a molecular weight of 1 million in the first bea...
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