A Membrane-Free and Oxygen-Free Direct Methanol Fuel Cell

Abstract

The invention relates to a filmless and oxygen-free direct methanol fuel cell, which comprises an anode liquid flow field plate (1) and a catholyte flow field plate (9). ) between the anode sheet, the electrolyte carrying chamber (6) and the cathode sheet in sequence, the electrolyte carrying chamber (6) contains the electrolyte (5), the anode uses methanol as fuel, and the cathode uses a Chemically reactive, high-potential redox couples act as oxidants for the solution. Compared with the prior art, the invention not only greatly reduces the cost of the direct methanol fuel cell, but also greatly reduces the ohmic internal resistance of the cell, accelerates the kinetics of the electrode reaction, and improves the overall performance of the cell.

Description

Technical field [0001] The present invention belongs to the technical field of fuel cells, and more particularly to a filmless oxygen-free direct methanol fuel cell. Background technique [0002] The proton exchange membrane fuel cell (PEMFCS) is an electrochemical energy conversion device having a hydrogen as a fuel, oxygen or air is an oxidant. Its core structure is a polymer electrolyte membrane sandwiched in a hydroxide and an oxygen reduction cathode. The hydrogen fuel is oxidized to the proton and electrons in the action of an anode catalyst, wherein the proton is transmitted to the cathode by a polymer electrolyte membrane while electrons are transmitted to the cathode through an outer circuit, and a hydrated water therein is adsorbed in the catalyst. With the advancement of PEMFCS, it is in a commercial edge, but there are still many challenges in the preparation of hydrogen fuels, storage and economics of storage and transportation, which seriously hinders the pace of it...

AI Technical Summary

Problems solved by technology

[0003] As far as the current development status of DMFCs is concerned, the polymer electrolyte membrane used in it requires high proton conductivity, good thermal stability, chemical stability and mechanical properties, which directly lead to the expensive price of the polymer electrolyte membrane. thus greatly increasing the cost of fuel cells

At the same time, in order to speed up the slow oxygen reduction reaction at the cathode of DMFCs to improve the performance of the battery, it is often necessary to use platinum-based noble metal catalysts that are scarce in resources and expensive at the cathode, which further increases the cost of the fuel cell.

In order to improve the performance of DMFCs and reduce its cost, most of the international methods have adopted measures such as modifying the existing polymer electrolyte membrane, developing new membrane materials, and developing new non-precious metal catalysts for oxygen electrodes, but there is still no fundamental However, the current DMFCs still have problems such as mixed potentials caused by methanol permeation, slow cathode kinetics and easy flooding, expensive polymer electrolyte membranes and cathode catalysts, etc., which seriously affect the performance improvement and commercial application of DMFCs. At the same time, it must also face the increasingly high requirements of modern electronic products for DMFCs, such as small volume, high energy density, and low cost.

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