Self-humidifying ordered polymer membrane electrode

Abstract

The invention discloses a self-humidifying ordered polymer membrane electrode in the technical field of membrane electrodes. The membrane electrode mainly comprises an ion conductor, an anode and a cathode, wherein the ion conductor comprises an ion exchange membrane and ion exchange polymer nanotube arrays which orderly and directionally grow on two surfaces of the ion exchange membrane. A support body of a catalyst in the membrane electrode is an ion exchange polymer nanotube array with one end fused together with the ion exchange membrane. The highly ordered ion exchange polymer nanotube arrays define the electrode porosity and the catalyst surface size in the ordered membrane electrode and can greatly optimize ion, electron and gas three-phase channels of a catalyst layer. The ion exchange polymer nanotube structures have water storage functions, self-humidifying electrochemical energy conversion of the membrane electrode can be achieved, the device system structure is simplified and the energy conversion efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of energy conversion and energy storage, in particular to 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 the fuel into electrical energy through electrochemical reaction. Environmentally friendly, high-efficiency, and high-power-density power generation methods have extremely attractive prospects, especially in distributed power stations, zero-emission transportation power, and portable power applications. 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 store it in fuel through elect...

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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