A kind of polyfurfuryl alcohol modified fuel cell proton exchange membrane and its modification method

Abstract

The invention belongs to the technical field of fuel cells, and concretely relates to a polyfurfuralcohol modified fuel cell proton exchange membrane and a modification method thereof. The method comprises the following steps: a, respectively preparing sols from glucosamine, furfuralcohol and chloromethyl methyl ether, and sequentially uniformly coating two sides of a Nafion membrane to obtain a composite membrane layer; b, performing microwave irradiation drying on the composite membrane layer under the protection of N2 until all sol layers in the composite membrane are solidified; and c, immersing a composite membrane obtained after the solidification in a phosphoric acid solution for 12-24 h, taking out the composite membrane, washing the composite membrane with water, drying the washedcomposite membrane, and peeling surface residual gel to obtain the polyfurfuralcohol modified fuel cell proton exchange membrane. The polyfurfuralcohol modified fuel cell proton exchange membrane hasthe advantages of high chemical stability, high mechanical strength and excellent electric conductivity.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a polyfurfuryl alcohol modified fuel cell proton exchange membrane and a modification method thereof. Background technique [0002] Proton Exchange Membrane Fuel (PEM) is the core component of PEMFC, and PEM is different from the diaphragm used in general chemical power sources. Proton exchange membrane fuel cells have become the most competitive clean alternative power source for gasoline internal combustion engines. The material used as PEM should meet the following conditions: good proton conductivity, small electroosmosis of water molecules in the membrane, as little gas permeability in the membrane as possible, good electrochemical stability, good dry-wet conversion performance, It has certain mechanical strength, good machinability and reasonable price. [0003] Proton exchange membrane fuel cells have the advantages of low operating temperature, fast start...

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Problems solved by technology

but The membranes still have the following disadvantages: (1) Difficult to manufacture and high cost, and the synthesis and sulfonation of perfluorinated substances are very difficult, and the hydrolysis and sulfonation in the process of film formation are easy to denature and degrade the polymer, making the formed Membrane is difficult, resulting in higher cost; (2) High requirements on temperature and water content, The optimum working temperature of the series of membranes is 70-90°C. Exceeding this temperature will cause the water content to drop sharply and the electrical conductivity to drop rapidly, which hinders the problem of increasing the electrode reaction speed and overcoming catalyst poisoning by appropriately increasing the working temperature; (3 ) Certain hydrocarbons, such as methanol, have high permeability and are not suitable for use as proton exchange membranes in direct methanol fuel cells (DMFC)

[0008] It can be seen that the existing proton exchange membrane fuel cell (PEFMC) has been paid close attention by researchers due to its excellent theoretical performance. However, in the actual preparation and use process, Nafion membrane still has high methanol permeability, difficult sulfonation, Modification can easily lead to the reduction of proton mobility and other problems that affect its practical use

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