A method for preparing a membrane electrode using a carbon tube membrane as a carrier

Abstract

The invention relates to a method for preparing a membrane electrode with a carbon tube film as a carrier, comprising the following steps: S1, uniformly dispersing carbon nanotube powder in an alcoholsolvent; 2, uniformly adhere that carbon nanotube powder on the gas diffusion lay through a filtering process to form a carbon tube membrane; S3, uniformly spraying a catalyst precursor containing aplatinum salt solution on the surface of the carbon tube film, and reducing the catalyst precursor so that the platinum salt is reduced into platinum particles to obtain a uniformly dispersed carbon-supported platinum film sheet; S4, uniformly spraying a layer of ionic conductor solution on the carbon-loaded platinum film, drying, and forming an ionic conductive layer on the surface of the platinum particles; 5, place that proton exchange membrane on the ion conductive layer and press the membrane electrode by a hot pressing process. The invention overcomes the problem of low utilization rateof platinum caused by the traditional carbon black as the carrier, realizes the accurate and controllable catalyst and electrolyte layer loading, short reduction cycle, simple equipment requirements,improves production efficiency and reduces cost.

Description

technical field [0001] The invention relates to the field of production and manufacture of membrane electrodes, in particular to a method for preparing membrane electrodes by using carbon tube membranes as carriers. Background technique [0002] A fuel cell is an energy conversion device that directly converts chemical energy into electrical energy, which does not involve the combustion process of a heat engine. Fuel cells have the advantages of environmental friendliness, high energy density, fast start-up at room temperature and high reliability. Compared with other fuel cells, the proton exchange membrane fuel cell (PEMFC) has a relatively low operating temperature and is suitable for use as an electric vehicle and a portable power source. The membrane electrode (MEA) assembly includes a catalyst layer, a gas diffusion layer and a proton exchange membrane, which provide continuous channels of protons, electrons, reactive gases and water for the electrochemical reaction o...

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Problems solved by technology

[0005] The deposition method can make the catalyst in-situ generated on the membrane, and obtain active metal particles and particle size distributions with different structures, sizes and shapes, but it is difficult to completely remove the residual impurity ions, which will change the composition of the membrane and deteriorate the electrical conductivity. In addition, the activity The deposition of metals generally has the problem of difficulty in uniform deposition and large particle size

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