Passive miniature methanol fuel cell membrane electrode and its preparation method

Abstract

The invention provides a passive miniature methanol fuel cell membrane electrode and its preparation method. The passive miniature methanol fuel cell membrane electrode is composed of a proton exchange membrane, an anode diffusion layer, an anode catalysis layer, a cathode diffusion layer and a cathode catalysis layer, wherein the cathode catalysis layer is composed of three-layer of superabsorbent nano particles in gradient distribution. The preparation method of the membrane electrode comprises the preparation of the cathode diffusion layer and the anode diffusion layer, the preparation of the anode catalysis layer, the preparation of the cathode catalysis layer and the process of forming membrane electrode by hot pressing. The passive miniature methanol fuel cell membrane electrode of the invention is capable of increasing the volumetric specific energy of a monomer battery, reducing the watered-out degree of the cathode, enhancing the mass transfer of oxygen, raising the power density and the discharge stability of the miniature methanol fuel cell. The invention has the advantages of convenient and rapid operation and easy control.

Description

Technical field: [0001] The invention relates to a membrane electrode and a preparation method thereof. Background technique: [0002] In recent years, electronics and information technology have developed rapidly. Under the strong impetus of market demand, various miniature portable electronic products such as mobile phones, notebook computers, MP3, digital imaging equipment, personal digital assistants (PDA), etc. have emerged one after another. , has brought great convenience to people's lives, and at the same time, it also puts forward higher requirements for the performance of micro power supplies. The fuel cell converts the chemical energy of the fuel and the oxidant into electrical energy, and is not limited by the Carnot heat engine cycle. As long as the fuel is provided, it can generate electricity. It has the characteristics of high energy conversion efficiency, environmental friendliness, quietness and high reliability. Micro direct methanol fuel cell (μDMFC) is ...

AI Technical Summary

Problems solved by technology

Chinese Patent Publication No. 102005582 discloses the structure and preparation method of a direct alcohol fuel cell membrane electrode assembly, and constructs a cathode catalytic layer with a gradient distribution of polytetrafluoroethylene (PTFE), thereby forming a gas transmission channel in the cathode catalytic layer , to improve the mass transfer of oxygen, but due to the use of hydrophobic materials, it is impossible to significantly increase the water concentration on the cathode side of the proton exchange membrane, and cannot form a high water pressure on the cathode side of the proton exchange membrane, so that the water from the Reverse osmosis capability from cathode to anode

Images