Direct methanol fuel cell capable of realizing pure methanol supply

Abstract

The invention discloses a direct methanol fuel cell capable of realizing pure methanol supply. The fuel cell comprises a cell shell, and a pervaporation membrane which is fixed on the cell shell and divides an inner chamber into a methanol fuel chamber and a steam chamber, wherein an anode flow field plate, a membrane electrode and a cathode flow field plate are sequentially arranged above the steam chamber from bottom to top in a stacking manner; a hollow cover plate covering a cathode collector plate is arranged at an open end of the cell shell in an insulation manner; a hydrophilic porous plate with hydrophily is arranged between the anode flow field plate and the anode side of the membrane electrode; a hydrophobic porous plate with hydrophobicity is arranged between the cathode side of the membrane electrode and the cathode flow field plate. According to the invention, continuous vaporization methanol supply is guaranteed, methanol crossover is restrained while cathode water is promoted to be reversely supplemented to the anode to participate in reaction, on the premise of guaranteeing output performance of the cell, the energy density of the cell is increased effectively, high-concentration methanol supply even pure methanol supply of the cell is realized and the service life of the cell is prolonged greatly.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell for realizing pure methanol supply for direct methanol fuel cells. Background technique [0002] Steam passive direct methanol fuel cell (V-DMFC) has more extensive development and research value because of its higher energy density, weaker methanol breakthrough phenomenon, and extended working time, but the steam supply method of V-DMFC and the Reasonable management methods have become a key factor to inhibit the overall performance improvement of V-DMFC, especially for the realization of pure methanol feed of V-DMFC, which is particularly important. [0003] The current method of providing methanol vapor for V-DMFC mainly relies on heating liquid methanol fuel to generate high temperature and high pressure methanol vapor. However, when high temperature methanol vapor participates in the reaction, the permeability of the proton exchange membrane is enhanced, resul...

AI Technical Summary

Problems solved by technology

[0003] The current method of supplying methanol vapor to V-DMFC mainly relies on heating liquid methanol fuel to generate high-temperature and high-pressure methanol vapor. However, when high-temperature methanol vapor participates in the reaction, the permeability of the proton exchange membrane is enhanced, resulting in more serious methanol breakthrough. phenomenon and waste of fuel; while the concentration of methanol vapor obtained by pervaporation technology is often too low at room temperature, which will cause serious concentration polarization and hinder the improvement of battery performance, and the gaseous fuel obtained by pervaporation technology contains methanol The problem that the content is significantly greater than the water content makes the concentration ratio of the reactants unbalanced and it is difficult to maintain the efficient operation of the battery

For the supply of pure methanol fuel, high-concentration methanol vapor obtained by pervaporation will not only cause serious methanol breakthrough, but also cause saturation of methanol vapor, resulting in low methanol vapor partial pressure and serious concentration extremes. phenomenon

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