Proton exchange membrane for medium-temperature fuel cell and preparation thereof

Abstract

The invention relates to a proton exchange membrane of fuel cells which can be used at medium temperature, which is a proton exchange membrane doped with sulfonated phenyl zirconium phosphonic acid. The proton exchange membrane is characterized in that the membrane preparing materials consist of sulfonated high molecular material and sulfonated phenyl zirconium phosphonic acid salts, wherein, the degree of sulfonation of sulfonated high molecular material selects 20 percent to 85 percent and accounts for 60 percent to 95 percent of the weight percentage of the membrane preparing material; and the degree of sulfonation of sulfonated phenyl zirconium phosphonic acid salts selects 30 percent to 90 percent accounts for 5 percent to 40 percent of the weight percentage of the membrane preparing material. Porous supporting materials can also be added into the membrane so as to improve strength of the membrane and reduce the deformability. The membrane preparing materials fill pores with the porous supporting materials and form a layer of membrane at the outer surface of the porous supporting materials. The invention is applicable to medium-temperature alcohol fuel cells so as to improve operating temperature of the fuel cells and improve the performance of the fuel cells.

Description

technical field

[0001] The invention relates to a fuel cell proton exchange membrane doped with sulfonated phenylphosphonate and a preparation method thereof. Background technique

[0002] At present, the key technical problems in the development of DMFC are the low catalyst activity and the alcohol permeation of the membrane. An effective way to solve the above two problems is to increase the operating temperature of the fuel cell. Therefore, the development and research of proton exchange membrane materials that can be used at medium temperature (120 ° C ~ 180 ° C) has become a hot spot in the development and research of DMFC today. Because, at this temperature, the catalyst, bipolar plate, sealing material and other materials of the battery can continue to be used, but the Nafion membrane material currently used can no longer be used. Therefore, the development and research of new proton exchange membrane materials that can be used under medium temperature conditions is...

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