Fuel battery proton exchange film with anti-penetration layer and its making method

Abstract

The present invention relates to a fuel cell proton exchange membrane having an anti-permeation layer and a preparation method thereof. The membrane has an anti-permeation membrane or layer compounded between two porous polymer matrix proton exchange membranes. The anti-permeation membrane or layer consists of a porous proton exchange membrane matrix and a filling body; the filling body is catalyst, or catalyst and proton exchange resin. The preparation method of the present invention comprises the following steps: the filling body material is dispersed in solvent, or 1-20wt percent of proton exchange resin is added in, so as to obtain catalyst slurry; a porous proton exchange membrane is dipped in the catalyst slurry, taken out, dried, boiled in H2SO4 solution, soaked in ion removing water, washed, dried and thermally pressed, obtaining the anti-permeation membrane or layer; the porous polymer matrix proton exchange membranes and anti-gas-permeation membrane are stacked in up-down alignment in the order of one porous polymer matrix proton exchange membrane, one anti-gas-permeation membrane and one porous polymer matrix proton exchange membrane; two polytetrafluoroethylene films in the same size are respectively arranged on the bottom and the upper part of the three stacked membranes; the three stacked membranes are thermally pressed and have the polytetrafluoroethylene films on the surface layer stripped away, and then the fuel cell proton exchange membrane having an anti-permeation layer can be obtained.

Description

technical field [0001] The invention relates to an enhanced proton exchange membrane for direct hydrogen or methanol fuel cells and a preparation method. The proton exchange membrane has low gas or methanol permeability and is beneficial to improving the performance of the fuel cell. Background technique [0002] Proton Exchange Membrane (PEM) is one of the core components of PEMFC. The perfluorosulfonic acid proton exchange membrane (Nafion®) produced by DuPont is commonly used at present.  Membrane), the membrane has relatively good proton conductivity and long service life. However, the disadvantages of this kind of film are that the synthesis route is long, the processing technology is complicated, the price is expensive, and it will easily swell and deform after absorbing water, and the mechanical strength will decrease. Moreover, when used in a direct methanol fuel cell (DMFC), it has high methanol permeability, which greatly reduces the performance of the fuel cell...

AI Technical Summary

Problems solved by technology

However, due to the use of a three-layer porous polymer reinforced composite proton exchange membrane, the hydrophobic characteristics of the base membrane are not fundamentally changed, so that the reaction gas may still permeate along the hydrophobic framework region, and this method will increase the proton exchange rate to a certain extent. Proton migration resistance of exchange membranes