Direct alcohol fuel cell electrode with internal flow field

Abstract

The invention belongs to the field of fuel cells, and relates to a direct alcohol fuel cell electrode with an internal flow field, which has the advantages that fuel transfer resistance is small, electrolyte concentration in a diaphragm is high, concentration distribution of reactants is uniform, and discharge property is good. The direct alcohol fuel cell electrode comprises a flow field, a diffusion layer, catalysis layers and the diaphragm, wherein the diffusion layer, the catalysis layers and the diaphragm are sequentially arranged from outside to inside, the internal flow field with a fuel inlet is arranged between the catalysis layers and the diaphragm to ensure that a mixed fuel firstly enters the internal flow field; because the internal flow field is in contact with the diaphragm, the concentration of the electrolyte in the diaphragm is high, thus the conductivity of the diaphragm is increased; a mixture of the internal flow field enters the catalysis layers and generates a chemical reaction between the catalytic layers, products obtained after the reaction penetrate through the diffusion layer to reach an external flow field for being discharged. Due to a downstream conveying mode of the reactants and the products, the defects of uneven distribution of fuels upstream and downstream, large transfer resistance of the fuels, low concentration of the electrolyte in the diaphragm, and the like in a countercurrent conveying mode adopted by a conventional process are overcome, the cell property is greatly improved, and a good application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to an inner flow field direct alcohol fuel cell electrode. Background technique [0002] Anion-exchange membrane direct alcohol fuel cells, on the one hand, because the working environment is alkaline, the oxidation-reduction reaction of the anode and cathode no longer depends on platinum-based noble metals, and even the reduction reaction of the cathode can be carried out based on non-metallic catalytic materials, and compared to In an acidic environment, the electrochemical reaction rate is faster; on the other hand, the branched chain of the anion exchange membrane is a quaternary amino group, and the main chain can be based on a hydrocarbon skeleton. The above characteristics make the anion exchange membrane direct alcohol fuel cell not only improve the reaction kinetics, but also significantly reduce the cost compared with the cation exchange membrane direct alcohol fuel c...

AI Technical Summary

Problems solved by technology

The electrode structure with such characteristics, on the one hand, the reverse flow of the product hinders the transmission of fuel, resulting in uneven distribution of upstream and downstream fuel; on the other hand, the transmission of liquid electrolyte is affected by reaction consumption and mass transfer resistance, resulting in the concentration of electrolyte in the membrane lower

Thereby affecting the discharge performance of the battery

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