Comparison of MEA Preparation Methods

Comparison of MEA Preparation Methods – Cheersonic

As the core component of direct methanol fuel cell (DMFC), membrane electrode (MEA) has a vital influence on battery performance. The traditional membrane electrode preparation method is to heat the diffusion medium (CDM) supporting the catalytic layer to both sides of the electrolyte. Due to insufficient contact between the catalytic layer and the electrolyte, the utilization rate of the electrocatalyst is reduced and the electrochemical performance of the CDM is restricted. The electrolyte-supported catalytic layer (CCM) that has received attention in recent years is a membrane electrode that directly prepares the catalytic layer on the surface of the electrolyte, which can increase the reactant/catalyst/electrolyte three-phase interface and improve the utilization rate of the electrocatalyst.

This article compares the advantages and disadvantages of the ultrasonic spraying method and the traditional spraying method for preparing the catalytic layer. The catalytic layer prepared by the knife coating method has fewer surface cracks and less surface roughness, and its MEA performance is better, and it is found that the surface morphology and surface of the catalytic layer Roughness has little effect on MEA performance. This article compares the advantages and disadvantages of the ultrasonic spraying method and the traditional spraying method for preparing the catalytic layer. The catalytic layer prepared by the blade coating method has fewer surface cracks and less surface roughness, and its MEA performance is better, and it is found that the surface morphology and surface of the catalytic layer Roughness has little effect on MEA performance.

But it found that the formed catalyst layer has low uniformity. Ultrasonic spraying can accurately control the Nafion content in the membrane electrode catalytic layer, reduce the thickness of the catalytic layer, and optimize the composition and structure of the MEA anode diffusion layer, and it allows large areas to be coated at high-speed with only minimal loss to coat catalyst suspension.

Cheersonic has committed to the research and development of various ultrasonic equipment for more than ten years. CENG-S, CENG-M and CENG-L developed by our company is basic, programmable micro material spray coating system. Various types of catalysts suspensions including the carbon black ink, PTFE binder, ceramic slurry, platinum and other precious metal can be sprayed by using these equipment. Cheersonic ultrasonic dispersion syringe pump is 25 ml glass syringe standard, by controlling module delivers electrical impulses to generate ultrasonic vibrations inside of syringe body, and duration and intensity of ultrasonic vibrations is user controlled to completely disperse and hold particles evenly suspended in solution for up to several hours.