High temperature proton exchange membrane in hydrophobic gel matrix and its preparation method and application

Abstract

The invention provides a high-temperature proton exchange membrane in a hydrophobic gel base and a preparation method and an application thereof, and particularly relates to a method in which a hydrophobic gel membrane is prepared from a hydrophilic monomer and amphiphilic macromolecules by graft modification, a methanol solution of a proton conductor is absorbed and the high-temperature proton exchange membrane can be prepared in the hydrophobic gel base in a vacuum drying manner. The proton conductivity of the synthetized hydrophobic gel base proton exchange membrane can achieve 0.001-0.02S.cm<-1> at the temperature of 180 DEG C and under a waterless environment. The preparation method disclosed by the invention is different from that of the proton exchange membrane doped with the conventional proton conductor. According to the preparation method, the unique adsorbability, a porous structure, and the retainability of the hydrophobic gel membrane are fully utilized to absorb the proton conductor into a three-dimensional net structure of the hydrophobic gel membrane so as to firmly seal the proton conductor. The high-temperature proton exchange membrane in the hydrophobic gel base, disclosed by the invention, is large in adsorption amount of the proton conductor, high in proton conductivity, wide in operating temperature range, low in cost, and large in improvement space, and the preparation method is simple and feasible.

Description

technical field [0001] The invention belongs to the field of new material technology and new preparation technology, and specifically relates to a novel hydrophobic gel-based medium-high temperature proton exchange membrane and its preparation method and application. Background technique [0002] Proton exchange membrane is a solid polymer electrolyte membrane with good proton conductivity, used to transport protons. Proton exchange membrane is a kind of proton conductive film formed by swelling, sulfonation or compounding with proton conductor by polymer or polymer composite. [0003] Proton exchange membranes originated from polyphenylene sulfonic acid membranes produced by GE in the early 1960s, but their stability and conductivity were poor, and they were soon replaced by Nafion membranes developed by DuPont. Due to the high price of Nafion membrane, low catalyst activity caused by low operating temperature, and low battery output power, Nafion-based proton exchange mem...

AI Technical Summary

Problems solved by technology

Limited to the degree of protonation and retention of PBI, the loading of phosphoric acid is low and the long-term washing of water generated by the cathode in the fuel cell leads to serious loss of phosphoric acid