Integrated diffusion layer of fuel cell and preparation method thereof, and application of integrated diffusion layer of fuel cell

Abstract

The invention relates to a gas diffusion layer of a fuel cell, in particular to an integrated diffusion layer and a preparation method thereof and application of an integrated diffusion layer. According to the preparation method, the novel integrated diffusion layer is prepared by taking carbon fibers as a skeleton, compounding multi-walled carbon nanotubes, taking nitrogen methyl pyrrolidone as adispersing agent for dispersing at a high speed and taking polytetrafluoroethylene (PTFE) as a binder and a water repellent through a reduced pressure suction filtration forming method in one step. The integrated diffusion layer replaces a traditional diffusion layer composed of carbon paper and a micropore layer, and when the integrated diffusion layer is applied to a cathode of a direct methanol fuel cell or serves as an anode diffusion layer and a cathode diffusion layer at the same time, the maximum power density of a single cell is improved by 20% and 35% compared with a commodity diffusion layer. The integrated diffusion layer is applied to a zinc-air battery oxygen electrode, the maximum power density reaches up to 200mA cm-2, and a potential direction is provided for exploration of a high-performance and low-cost novel diffusion layer process and material of a fuel cell.

Description

technical field

[0001] The invention relates to a fuel cell gas diffusion layer, in particular to an integrated diffusion layer and its preparation method and application. Background technique

[0002] Proton exchange membrane fuel cells (PEMFC), direct methanol fuel cells (DMFC) and metal-air batteries have become popular in recent years because of their high power density, high energy conversion efficiency, low-temperature start-up, no pollution, and light weight. Research Hotspots [1-3] . Membrane electrode (MEA), the core component in fuel cells, is usually prepared by hot pressing process from gas diffusion layer, catalytic layer and proton exchange membrane. The gas diffusion layer is located between the catalytic layer and the flow field plate, and generally consists of two parts: the backing layer (BackingLayer, BL) and the microporous layer (Microporous Layer, MPL). [4] . The support layer mainly supports the microporous layer and the catalytic layer, collects c...

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