Method for preparing high-efficiency membrane electrode of direct methanol fuel cell

Abstract

The invention discloses a method for preparing a high-efficiency membrane electrode of a direct methanol fuel cell and belongs to the structure of a high-efficiency membrane electrode component of the direct methanol fuel cell and the technical field of manufacturing of structures of high-efficiency membrane electrode components. A proton exchange membrane is adopted as an electrolyte membrane by the membrane electrode, a platinum-ruthenium black catalyst and a platinum black catalyst are respectively adopted as a cathode catalyst and an anode catalyst, isopropyl alcohol and redistilled water are adopted as dispersing agents. During preparation, an ultrasound spray-coating technology is applied in a temperature field, the agglomeration morphology of catalyst particles is adjusted by the adjustment on factors such as ingredient proportioning and preparation environments of catalyst slurry, a proton channel with a nano wire structure is prepared in a catalytic layer, so that a continuous proton channel is established effectively in the microstructure of the prepared membrane electrode, the internal resistance of the cell is reduced, the electrochemical surface area of the electrode is increased, and therefore, the efficiency of the catalytic layer of the membrane electrode is improved.

Description

technical field [0001] The invention relates to a method for preparing a high-efficiency catalytic layer structure of a direct methanol fuel cell, and belongs to the technical field of high-efficiency membrane electrode assembly structures and manufacturing of direct methanol fuel cells. Background technique [0002] Direct Methanol Fuel Cells are considered the most commercially viable portable energy source of this century to fill the electronics industry's "power gap". However, the lower battery performance is one of the main factors restricting its commercialization, especially during the battery discharge process, the anode has a higher overpotential than the cathode. Most of the existing literature is aimed at the development of new high catalytic activity catalysts and their supports, the development of new high-resistance alcohol performance proton exchange membranes or the modification of Nafion membranes, the optimization of diffusion layer and microporous layer ma...

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Problems solved by technology

[0005] It can be concluded from the preparation of the catalyst slurry that the volume of the noble metal particles is much larger than that of the Nafion binder, so the establishment of proton channels is more difficult than the establishment of electronic channels

However, none of the above technologies has established a coherent proton channel in the catalytic layer, and the preparation process of the membrane electrode is relatively complicated, which makes it difficult to ensure the consistency of the performance of the membrane electrode; The phenomenon that the active sites of the catalyst are buried by the proton polymer in the

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