High temperature proton exchange film for fuel cell and method for making same

Abstract

The invention relates to a high temperature proton exchange membrane used for a fuel cell and the preparation method, belonging to the fuel cell technological field. The invention provides a base of the high temperature proton exchange membrane, comprising an acidic organic polymer and a plurality of nanometer inorganic particles which are uniformly dispersed inside the polymer base. The surface of particles is coated by the polymer with solvation function to the proton; wherein, the acidic organic polymer is the proton donor, the ether oxygen atom coated on the surface of the inorganic particles produces the solvation function to the proton, so as to form free proton, and the inorganic particles coated with the acidic organic polymer and the ether oxygen polymer are not dissolved mutually so as to form a phase interface providing a convenient channel for the proton transmission. The invention has the advantages that the high temperature proton exchange membrane is independent on the water existence under the high temperature condition so as to have higher proton conductivity, good methanol diffusion resistance and mechanical property, the invention has low cost and provides the proton exchange membrane with industrial applicability for the fuel cell field.

Description

technical field [0001] The invention relates to a high-temperature proton exchange membrane for fuel cells and a preparation method thereof, belonging to the technical field of fuel cells. Background technique [0002] A fuel cell is a device that converts chemical energy stored in fuel and oxidant directly into electrical energy. The difference from conventional batteries is that as long as fuel and oxidant are supplied, there will be continuous power output. Fuel cells produce almost no NO x and SO x emissions. Moreover, CO 2 Emissions are also reduced by over 40% compared to conventional power plants. At the same time, it also has the advantages of fast start-up, long battery life, high specific power, and high specific energy. These characteristics determine that it is used in fixed power generation systems, on-site power supplies, distributed power supplies, space vehicle power supplies, portable electronic products, and vehicle power supplies. It has broad applic...

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Problems solved by technology

H.Y.Chang, C.W.Lin.Proton conductingmembranes based on PEG / SiO 2 Nanocomposites for direct methanol fuel cells.Journal of Membrane Science 218, (2003) disclosed organic-inorganic composite membrane PEG / SiO 2 When the membrane is used at high temperature, the thermal movement of the polyethylene glycol segment is accelerated, the high crystallinity of the polymer is overcome, and a quasi-liquid conductor for proton conduction is formed, thereby improving the conductivity of the proton exchange membrane, but , the proton donor of the membrane is dodecylbenzenesulfonic acid, which has good water solubility, but does not have the performance of alcohol inhibition. When used in an environment with water, dodecylbenzenesulfonic acid will dissolve in water And gradually lost, resulting in a decrease in the concentration of protons in the diaphragm, which eventually leads to a decrease in the conductivity of the diaphragm; in addition, due to the low mechanical and mechanical properties of polyethylene glycol, it cannot play a supporting role in the fuel cell and is not suitable for high-temperature fuel cells. practical application value

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