Oxygen ion exchange membrane and preparation method thereof and application of oxygen ion exchange membrane in fuel cell

Abstract

The invention relates to an oxygen ion exchange membrane and a preparation method thereof and an application of the oxygen ion exchange membrane in a fuel cell, belongs to the technical field of fuelcell membranes and aims at solving the first technical problem of providing the preparation method of the oxygen ion exchange membrane. According to the method, perfluorinated organic acid ester is utilized as a raw material and a metal organic phase is formed through compounding a metal salt and borate; two C-O-C bonds of an ester group are broken through the catalytic action of a metal matrix; apolymerization inhibitor and a stabilizer are added to inhibit crosslinking reaction; most of materials form a metastable phase which contains porous free oxygen and a carbon dangling bond; and the membrane is finally formed by the metastable phase through physical means. The invention provides a novel oxygen ion conduction mechanism. Transmission of oxygen ions in a membrane material is achievedthrough using an organic matter as an oxygen ion carrier, the working temperature of a low-oxygen ion electrolyte membrane can be greatly reduced and a new development direction is provided for preparation of the membrane material for the fuel cell.

Description

technical field [0001] The invention relates to an oxygen ion exchange membrane, a preparation method thereof and an application in fuel cells, and belongs to the technical field of fuel cell diaphragms. Background technique [0002] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy, also known as an electrochemical generator. It is the fourth power generation technology after hydropower, thermal power and atomic power. Since the fuel cell converts the Gibbs free energy in the chemical energy of the fuel into electrical energy through an electrochemical reaction, it is not limited by the Carnot cycle effect, so the efficiency is high; Transmission parts, so there is no noise material, and the harmful gas emitted is very little; sound pollution. It can be seen that from the point of view of saving energy and protecting the ecological environment, fuel cells are the most promising power generation technology. [0003]...

AI Technical Summary

Problems solved by technology

The most commonly used proton exchange membrane (PEMFC) so far is still the Nafion membrane of DuPont in the United States, but the Nafion membrane still has the following disadvantages: (1) It is difficult to manufacture and high in cost, and the synthesis and sulfonation of perfluorinated substances are very difficult. Moreover, the hydrolysis and sulfonation in the film-forming process will easily denature and degrade the polymer, making film-forming difficult and resulting in higher costs; (2) high requirements on temperature and water content, the best working temperature of Nafion series membranes is 70 ~90°C, if the temperature exceeds this temperature, the water content will drop sharply, and the conductivity will drop rapidly, which hinders the problem of increasing the electrode reaction speed and overcoming catalyst poisoning by properly increasing the working temperature; (3) some hydrocarbons, such as methanol etc., high permeability, not suitable for direct methanol fuel cell (DMFC) proton exchange membrane

[0005] The above patents all use perovskite ceramic membranes. Due to the high working temperature and long start-up time of solid oxide and perovskite ceramic electrolyte membranes, they are greatly restricted in the direction of electric vehicles. Therefore, for oxygen ion conduction The reduction of the operating temperature of the electrolyte membrane has very important practical significance