Micro-fuel cell suitable for high-concentration methanol and discharging method of micro-fuel cell

Abstract

The invention discloses a micro-fuel cell suitable for high-concentration methanol and a discharging method of the micro-fuel cell. An existing direct methanol fuel cell cannot use a high-concentration methanol solution as the supplied solution. The micro-fuel cell suitable for high-concentration methanol provided by the invention comprises an anode external flow field plate, an anode polar plate,a membrane electrode, a cathode polar plate and a cathode end plate which are arranged in sequence. A serpentine flow channel groove is formed in the inner side surface of the anode external flow field plate. The serpentine flow channel groove does not penetrate through the anode external flow field plate. The membrane electrode comprises an anode electrode, a proton exchange membrane, a cathodeelectrode and a metal mesh. The anode electrode is composed of an anode diffusion layer and an anode catalytic layer. According to the micro-fuel cell, the input methanol solution suffers from the double obstruction of the serpentine flow channel groove and the anode plate on the anode external flow field plate, so that high-performance output and high stability of the micro-fuel cell still can bekept under the supply of low-flow-rate high-concentration fuel, the liquid accumulation size of reactants is effectively reduced, and the fuel utilization rate is improved.

Description

technical field [0001] The invention belongs to the technical field of direct alcohol fuel cells, and in particular relates to a micro fuel cell suitable for high-concentration methanol and a discharge method thereof. Background technique [0002] Direct alcohol fuel cells have become one of the most promising mobile power sources due to their high energy density, easy fuel storage, low operating temperature, rapid response, clean environmental protection, and easy portability. Its working principle is: the alcohol fuel passes through the anode flow field through the anode diffusion layer to the anode catalytic layer for oxidation reaction to generate carbon dioxide gas, protons and electrons, the protons pass through the proton exchange membrane to the cathode catalytic layer, and the oxygen diffused in from the cathode A reduction reaction occurs to generate water, and electrons enter the cathode side through an external circuit, thereby driving the load to work. [0003]...

AI Technical Summary

Problems solved by technology

This makes the actual operating voltage of the direct methanol fuel cell lower than the theoretical value; and the higher concentration of methanol supply will aggravate the phenomenon of methanol permeation, so the direct methanol fuel cell cannot use high-concentration methanol solution for liquid supply, and generally speaking, its liquid supply is the best The concentration of methanol is between 1mol / L and 2mol / L

This low supply liquid concentration directly leads to low fuel utilization rate and greatly improved storage space, making the overall energy density of the fuel cell system low

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