Study And Fabrication On The Pt Catalyst Of Micro Direct Methanol Fuel Cell

Micro Direct Methanol Fuel Cell (μ-DMFC) with high efficiency, high volume and weight ratio capacity density, convenient fuel supplies, storage easy to carry, small environment pollution, etc. is one of the most application prospect of new energy in portable electronic devices. Fuel cell is a kind of energy power generation devices, by electrochemical reaction which, persistently transforms the chemical energy of the fuel and oxidant directly into electrical energy. While micro direct methanol fuel cell (μ-DMFC) which directly uses methanol as anode fuel is a proton exchange membrane fuel cell, and it has a long working hours, low working temperature, methanol is plentiful and storage is convenient, easy to miniaturization and integration, and small pollution to the environment. It is one of the most promising alternative types of power supply to traditional power supply used in portable electronic devices.First of all, this article puts μ-DMFC as the research object, combines traditional mathematical theory of fuel cells with micro-scale fluid mechanics, establishes the mathematical model of the battery and introduces the basic theory and the internal transmission mechanism of the direct methanol fuel cell.Second, according to the conservation of momentum, conservation of mass and electrochemical, micro-scale fluid study, the model analyses the battery temperature, concentration of methanol solution, the performance of μ-DMFC influence from structural parameters of diffusion layers and catalyst layers. We use CFD software COMSOL Multi-physics to calculate the model, and get the following results: relative to the catalyst layer, battery performance is largely dependent on the parameters of the diffusion layer. Within a certain range, appropriate increase of the diffusion layers and catalyst layers’porosity is beneficial to the battery performance improvement.Finally, platinum group metal nanometer materials is the catalyst, widely used in fuel cell, petrochemical and other fields, to further improve the catalytic activity, stability and efficiency has been the important scientific problems and key engineering problems of the related areas. This paper uses the sputtering method and electrochemical deposition method for the preparation of Pt-C catalyst, and analyzes and compares the catalytic performance of Pt-C catalyst prepared by the two kinds of methods.