Micro direct methanol fuel cell membrane electrode and preparation method thereof

Abstract

The invention discloses a micro direct methanol fuel cell membrane electrode and a preparation method thereof, and relates to a fuel cell and a preparation method thereof. The membrane electrode comprises an anode diffusion layer, an anode catalyst layer (3), a proton exchange membrane, a cathode catalyst layer (5) and a cathode diffusion layer, wherein the cathode catalyst layer (5) includes an inner layer (5a), an intermediate layer (5b) and an outer layer (5c); the outer layer (5c) is nearest to the cathode diffusion layer; and the inner layer (5a) is nearest to the proton exchange membrane. The preparation method comprises the following steps: taking carbon paper or carbon cloth as a supporting layer, then coating the diffusion layer formed by a carbon material, polytetrafluoroethylene and the like, coating a size formed by a catalyst, Nafion resin, a pore forming substance and the like for several times, and performing heat treatment and pressing to form the membrane electrode. The micro direct methanol fuel cell membrane electrode can inhibit the water permeation of the proton exchange membrane, enhance the splashing effect from the cathode to the anode, and improve the gas diffusion mass propagation speed.

Description

Technical field [0001] The invention involves a fuel cell and its preparation method, which specifically involves a membrane electrode and its preparation method that can improve the performance of miniature direct methanol fuel cells. Background technique [0002] The fuel cell technology is considered to be the clean and efficient power generation technology preferred in the 21st century, and will be widely used in the fields of aerospace, military, energy, communications and transportation.Direct methanol fuel cells are a type of fuel cell. It has the advantages of high energy density, high sources of methanol, low price, low price, easy -to -store and carrying, high system structure, simple system structure, no fuel reorganization and purification, and easy operating conditions.In recent years, many internationally renowned companies have conducted a wide range of research and have demonstrated their respective prototypes to make UDMFC (miniature direct methanol fuel cells) t...

AI Technical Summary

Problems solved by technology

Because methanol is easy to permeate the proton exchange membrane, the concentration of the methanol solution used as the anode fuel is usually low. However, the low concentration of methanol makes the water on the anode side easily penetrate into the cathode side. In addition, the chemical reaction in the cathode catalytic layer Water will also be generated. If the water cannot be discharged normally, it will cause the cathode to flood and cause battery performance to decline. Therefore, water management is an important aspect that needs to be considered in battery design.

Images