Proton exchange membrane

Abstract

The invention belongs to the technical field of a fuel cell, in particular to a proton exchange membrane. The proton exchange membrane is prepared from a combination comprising a sulfonated poly ether ether ketone solution, sulfonated polyphenylene oxide sppo, a polyaniline filter liquid, heteropoly acid and a titanium dioxide fluid. The proton exchange membrane has the advantages of favorable mobility and processability; with the combination of the titanium dioxide fluid, the sulfonated poly ether ether ketone solution, the sulfonated polyphenylene oxide sppo and the polyaniline filter liquid, the reduction of proton conductivity can be reduced, the methanol permeability of the composite proton exchange membrane is effectively reduced, the comprehensive performance of the proton exchange membrane is improved, the methanol permeation problem when an Nafion membrane is used for a direct methanol fuel cell (DMFC) is solved, the proton conductivity is also not reduced, and the requirement for PEM used by the DMFC is met; and the proton exchange membrane can be used for the DMFC and also can be used for an alcohol fuel cell such as a direct ethanol fuel cell.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a proton exchange membrane. Background technique [0002] Energy is the lifeblood of the national economy. With the depletion of petroleum resources, the research and development of alternative new energy sources is imminent. As a new type of energy, fuel cells can directly convert the chemical energy stored in fuels and oxidants into electrical energy, and have broad application prospects. Among various types of fuel cells, direct methanol fuel cells (DMFC) use methanol aqueous solution or methanol vapor as fuel supply source. It is the most suitable mobile power source for electric vehicles or other portable devices. [0003] As the absolutely key material of DMFC, the proton exchange membrane can effectively separate fuel and oxidant, allow protons to pass freely, but insulate electrons, and it is also the substrate of electrolyte and electrocatalyst. Excelle...

AI Technical Summary

Problems solved by technology

Perfluorosulfonic acid-type proton exchange membrane has the advantages of high mechanical strength, good chemical stability, and high proton conductivity when the water content is high, and is widely used in proton exchange membrane fuel cells, proton exchange membrane electrolysis of water and ion membrane electrolyzer for caustic soda production , but the perfluorosulfonic acid membrane has a high methanol permeability, resulting in a decrease in fuel utilization, and will generate a mixed potential on the cathode, which greatly reduces the performance of the battery. In addition, the preparation process of the perfluorosulfonic acid membrane is very complicated and expensive , these shortcomings limit the large-scale application of perfluorosulfonic acid membranes in DMFC