Preparation method and application of self-supporting ordered structure membrane electrode

Abstract

The invention discloses a preparation method and application of a self-supporting ordered structure membrane electrode, and belongs to the technical field of electro-catalysis membrane reactors. The method comprises: taking a porous structure solid material with an electro-catalysis function as a catalytic electrode; preparing a polymer of an ion conducting membrane into a polymer solution; salivating the polymer solution on the surface of the solid material to form a uniform thin layer, so that the surface is completely covered, the holes of the solid material are infiltrated, the interface area of the solid material and the polymer solution is increased, and active sites of the electrocatalyst are fully exposed; and covering another solid material on the polymer thin layer, heating and drying, and sealing to obtain the membrane electrode. According to the invention, the thickness of the film can be reduced by regulating and controlling the thickness of the film casting liquid coating, the ultrathin film with the bent surface is formed, the film is tightly attached along the uneven electrode surface, and the bonding firmness is enhanced; and the membrane electrode is of a three-dimensional surface structure, a larger interface area is provided, ion transfer is facilitated, and the performance of the membrane electrode is improved.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic membrane reactors, and in particular relates to a preparation method and application of a membrane electrode with a self-supporting ordered structure. Background technique [0002] Membrane electrode is a high-efficiency electrochemical reaction functional device. It is usually composed of three parts: gas diffusion layer (GDL), catalytic layer (CL) and ion-conducting membrane. The two sides of the ion-conducting membrane are catalytic layers. Depending on the application scenario, the load is different. electrocatalyst. The device is used in fuel cells and electrolyzed water to produce hydrogen. It integrates the functions of electrochemical reaction, energy conversion and material transport into one component, which not only reduces the number of components in the electrochemical device, improves the integration and reliability of the device, but also realizes The "zero gap" combinatio...

AI Technical Summary

Problems solved by technology

However, there are several common problems in the existing methods

1) In the membrane electrode preparation process, the finished solid ion-conducting membrane is used, and the two are combined through certain technological means, which often leads to the problem of high interface resistance between the electrocatalyst and the ion-conducting membrane; 2) The catalyst particles, binder Mixing slurry, using spraying or transfer printing methods, combined with ion-conducting membranes, there are problems such as catalyst particle aggregation and peeling during use, and it is difficult to maintain the long-term stability of membrane electrodes; 3) Multiple preparation steps are required, resulting in actual production The process is complicated and it is difficult to ensure the uniformity of membrane electrode quality

In addition, because the preparation process requires sufficient mechanical strength, it is difficult to achieve ultra-thin ion-conducting membranes, which makes it difficult to reduce the resistance of ion transfer.

In view of the prior art methods, it is difficult to ensure the tight combination between the catalyst and the polymer membrane on the microscopic scale

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