Preparation method of membrane electrode and fuel cell

Abstract

The present invention provides a preparation method of a membrane electrode. The method comprises the following steps: coating a catalyst paste on the two surfaces of an anion exchange membrane and then performing cross-linking treatment to obtain a basic film-coated electrode; placing the basic film-coated electrode between a cathode gas diffusion layer and an anode gas diffusion layer and then performing heat pressing to obtain the membrane electrode. The catalyst paste contains an anion exchange resin, and the anion exchange resin have groups capable of performing cross-linking, wherein thecomposition of the anion exchange resin is identical with the composition of the anion exchange membrane. According to the preparation method of the membrane electrode, the composition of the anion exchange membrane is identical with the composition of the anion exchange resin in a catalyst layer, and the anion exchange membrane and the anion exchange resin all have groups capable of performing cross-linking. A whole cross-linking type film-coated electrode is formed by performing cross-linking treatment on the anion exchange membrane and the catalyst layer, the prepared membrane electrode byusing a post cross-linking method has high mechanical strength, and the mass transfer resistance of OH<-> between the anode and cathode catalyst layers and the anion exchange membrane in the membraneelectrode is also reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for preparing a membrane electrode and a fuel cell. Background technique [0002] In recent years, energy crisis and environmental pollution have become a major problem facing mankind. Fuel cells have been extensively studied due to their advantages of no pollution and high energy efficiency, among which ion-exchange membrane fuel cells are the representative. In the previous decade, proton exchange membrane fuel cell (PEMFC) became the mainstream research object among ion exchange membrane fuel cells, which benefited from its high energy density. However, the ion-exchange membrane and noble metal catalyst used in proton exchange membrane fuel cell (PEMFC) are expensive, which greatly limits its application. [0003] Major anion exchange membrane fuel cells (AEMFC) have received great attention in recent years, and it is expected to become a substitute for proton exc...

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Problems solved by technology

Although this method improves the adhesion of the catalytic layer on the anion exchange membrane, the increase of the transition layer does not substantially improve the phase interface problem in the catalytic layer, and the increase of the transition layer increases the thickness of the membrane electrode itself, which It has a negative effect on the conduction of ions and will reduce the performance of the battery

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