Preparation method of a self-humidifying ordered polymer membrane electrode

Abstract

The invention discloses a preparation method of a self-humidifying ordered polymer membrane electrode, belonging to the technical field of membrane electrode preparation. An ordered ion exchange polymer nanotube array prepared through the method is fused together with a polymer membrane and is provided with highly ordered ion, electron and gas mass transfer channels, and electrochemical three-phase reaction interfaces are distributed in the outer surfaces of polymer nanotubes with water storage functions, so that a high-efficiency energy conversion process can be carried out in a self-humidifying manner. A catalyst in a nanoparticle or microparticle state is bonded on the surface of the ion exchange polymer nanotube array to form a catalysis layer and is relatively high in specific surface area and catalytic activity, so that the three-phase reaction interfaces of the membrane electrode are greatly added, the electrochemical polarization, the ohmic polarization and the concentration polarization of the electrode are reduced, the energy conversion efficiency is improved, and the reaction speed is increased. According to the preparation method, a membrane electrochemical reactor system is expected to be remarkably simplified, the energy conversion efficiency and the stability are improved, and the operation life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of membrane electrode preparation, and in particular relates to a method for preparing a self-humidifying ordered polymer membrane electrode for energy conversion. Background technique [0002] Polymer Electrolyte Fuel Cell (PEFC), such as proton exchange membrane fuel cell, direct methanol fuel cell, and alkaline membrane fuel cell, can directly convert the chemical energy in fuel into electrical energy through electrochemical reaction, which is an environmentally friendly and efficient Power generation methods with high power density, especially in distributed power stations, zero-emission traffic power, and portable power applications, have extremely attractive prospects. Contrary to the working principle of fuel cells, electrolyzers (SPE electrolyzers for short) with solid polymer membranes (Solid Polymer Electrolyte, SPE) as electrolytes can directly convert electrical energy into chemical energy and st...

AI Technical Summary

Problems solved by technology

The catalytic layer and the interface with material composition and micropore disorder distribution not only reduce the electrochemical performance of the membrane electrode (energy loss is mainly manifested as electrochemical polarization and concentration polarization), but also seriously affect the long-term stability

Therefore, in view of the bottleneck problems existing in the existing membrane electrodes: the three-dimensional structure of the ion, electron, gas, and water channels in the electrode lacks controllable design and corresponding preparation methods, the three-phase interface of the electrochemical reaction in the electrode cannot self-moisture, and the three-phase Fewer interfaces and longer mass transfer microchannels lead to strong electrochemical polarization and concentration polarization of the membrane electrode during energy conversion, which affects energy conversion efficiency and reaction rate

This invention still cannot solve the problem of membrane electrode self-humidification energy conversion application, and from the perspective of the preparation process, because the proton conductor nanofiber is easy to deform at high temperature, the preparation process of the invention using two single-electrode lamination heating molding will bring The destruction of the proton conductor nanofiber array, and the interface in the electrolyte will also increase the ohmic polarization during the energy conversion of the membrane electrode

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