A Self-Humidifying Ordered Polymer Membrane Electrode

A polymer film and polymer technology, applied in battery electrodes, circuits, fuel cells, etc., can solve the problem of increasing the energy conversion of membrane electrodes, ohmic polarization, reducing the electrochemical performance of membrane electrodes, three-phase interfaces with less mass transfer microchannels, etc. problems, to achieve the effect of improving energy conversion efficiency and reaction rate, increasing three-phase reaction interface, and reducing concentration polarization loss

Active Publication Date: 2016-08-17
国鸿氢能科技(嘉兴)股份有限公司
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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

Method used

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preparation example Construction

[0035] A method for preparing an ordered polymer membrane electrode of the present invention, the process is shown in Figure 2-3 , including the following steps:

[0036] (1) Provide a porous template with an array of holes, which is ready for use after cleaning;

[0037] (2) Place a piece of ion exchange membrane between the above two symmetrically placed porous templates, and fix it into a three-in-one assembly of porous template|ion exchange membrane|porous template;

[0038] (3) Hot press the above-mentioned three-in-one component, so that the ion-exchange membrane becomes fluid and enters the array holes of the porous template;

[0039] (4) Place the hot-pressed three-in-one assembly in an acidic or alkaline solution to dissolve the porous templates on both sides of the ion-exchange membrane to obtain an ion-exchange polymer nanotube array|ion-exchange membrane|ion Ordered ionic conductors of exchange polymer nanotube arrays;

[0040] (5) Perform ion exchange and clea...

Embodiment 1

[0049] Embodiment 1 is used for proton exchange membrane electric fuel cell

[0050] Use 1% (mass fraction) sodium dodecylsulfonate solution to clean the 5cm*5cm AAO porous template (hole diameter is 400nm, thickness 50μm), put it into a petri dish, put the petri dish into vacuum oven. The temperature of the oven was set at 50°C, and the vacuum was evacuated to 0.1 atmosphere for 1 hour before use. The aluminum oxide porous template and the 150 micron thick Nafion membrane were fixed on the Cu sheet cleaned with alcohol to form a three-in-one assembly of alumina porous template|Nafion membrane|alumina porous template. Place the above-mentioned three-in-one component in a hot press, set the temperature at 90°C, set the pressure at 10Mpa, and keep the pressure for 1 hour. After hot pressing, take out the three-in-one assembly, put it into a 5mol / L NaOH solution, keep it in a constant temperature box at 60°C, take it out after 1 hour, clean it with deionized water, and get an o...

Embodiment 2

[0053] Embodiment 2 is used for alkaline membrane fuel cell

[0054] Use 1% (mass fraction) sodium dodecylsulfonate solution to clean the 5cm*5cm aluminum oxide porous template (pore diameter is 50 nm, thickness 1 micron), put it into a petri dish, put the petri dish into a vacuum oven. The temperature of the oven was set at 50°C, and the vacuum was evacuated to 0.1 atmosphere for 1 hour before use. A stainless steel sheet cleaned with acetone was used to fix the alumina porous template and the quaternized polysulfone membrane with a thickness of 5 microns to form a three-in-one assembly of alumina porous template|quaternized polysulfone membrane|alumina porous template. The above-mentioned three-in-one assembly was placed in a hot press, the temperature was set at 240°C, the pressure was set at 10Mpa, and the pressure was maintained for 1 hour. After hot pressing, take out the three-in-one assembly and put it in a 5mol / L NaOH solution, keep it warm at 60°C in an incubator, ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86
CPCH01M4/8605H01M8/04149H01M8/1004H01M2008/1095Y02E60/50
Inventor 王诚刘锋张剑波王建龙
Owner 国鸿氢能科技(嘉兴)股份有限公司
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