Method for directly preparing catalytic layer of platinum monoatomic layer used for proton exchange membrane fuel cell

Abstract

The invention discloses a method for directly preparing a catalytic layer of a platinum monoatomic layer used for a proton exchange membrane fuel cell. The method comprises the following steps of directly preparing a Pd/C catalytic layer in advance by using the catalytic layer through electrospinning technique, selecting polymer such as polyacrylic acid as a binder, afterwards, in a three-electrode system, adopting an underpotential deposition method to deposit Cu of a monoatomic layer on the Pd/C catalytic layer, then performing replacement to obtain the Pt of the monoatomic layer, and finally preparing a Pd/C@PtML catalytic layer. The Pd/C@PtML catalytic layer serves as a cathode, the Pd loading is 0.15mg/cm<-2>, the Pt loading is 0.02mg/cm<-2>, the maximum power density of a single cellis 560mW/cm<-2> (H2-Air), so that the Pd/C@PtML catalytic layer is superior to a catalytic layer of which the cathode Pt loading is 0.09mg/cm<-2>. By carrying out single cell acceleration attenuationtests on two catalytic layers, the Pd/C@PtML catalytic layer can be found to have better stability.

Description

technical field [0001] The invention belongs to the field of fuel cells and relates to a method for directly preparing a platinum monoatomic layer catalytic layer for a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high power density, high energy conversion efficiency, low temperature start-up, and environmental friendliness, and is considered as an ideal power source for stationary power stations, electric vehicles, and portable power sources. Then, if it wants to be successfully commercialized, it mainly faces two problems of cost and lifespan. In the fuel cell components, the cost of the catalyst accounts for nearly half, and reducing the catalyst load is the most direct way to reduce the cost of the fuel cell. Therefore, the preparation of highly active catalysts and the optimization of the electrode preparation process to enable low-load catalysts to still have high catalytic performan...

AI Technical Summary

Problems solved by technology

The disadvantages of the traditional method of preparing membrane electrodes: the carbon-supported catalyst and the electrolyte components are randomly mixed, and their uniformity cannot be guaranteed, and the three-phase interface of protons, electrons, and gases cannot be effectively constructed. The pores of the catalytic layer are relatively dense, which is not conducive to mass transfer. Battery performance is poor at lower loads

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