Membrane mobile phase of direct methanol fuel cell, and preparation method

Abstract

The membrane mobile phase includes membrane carrier (MC), and gel mobile phase (GMP) membrane coated on surface of MC. Being dipped to and lifted from sol mobile phase (SMP), membrane carrier forms GMP membrane after step of air-dry. MC is silk net type metal material with high conducting power, and not dissolved to dilute sulfuric acid. SMP is prepared from methanol, vitriol, water, heteroacid, metallo-organic compound or metal salt. SMP is prepared through following steps: using metallo-organic compound or metal salt as precursor; methanol as dispersion medium in mobile phase; adding vitriol and water; through hydrolytic reaction, polycondensation reaction to form sol; doping heteroacid to produce SMP. The invention solves issue of methanol leakage radically so as to lower poisoning cathode and anode catalyst of direct methanol fuel battery (DMFB). The invention raises performance of DMFB, simplifies structure of battery, and promotes progress of industrialization of DMFB.

Description

Technical field: [0001] The invention relates to a mobile phase (flux phase) of a direct methanol fuel cell. Background technique: [0002] Direct Methanol Fuel Cell (DMFC) has the advantages of low energy consumption, high energy density, abundant sources of methanol, low price, simple system, convenient operation, low noise, etc. Promising chemical power sources have attracted widespread attention. At present, the development of direct methanol fuel cells faces two key problems: one is that the solid electrolyte membrane widely used in direct methanol fuel cells is the Nafion membrane originally designed for hydrogen-oxygen proton exchange membrane fuel cells, which has obvious methanol leakage ( crossover) phenomenon, methanol directly penetrates the Nafion membrane and is lost, resulting in a large loss of methanol fuel and a decrease in the power density of the DMFC. At the same time, methanol seeps into the cathode and reacts on the cathode, resulting in poisoning of ...

AI Technical Summary

Problems solved by technology

At present, the development of direct methanol fuel cells faces two key problems: First, the solid electrolyte membrane widely used in direct methanol fuel cells is the Nafion membrane originally designed for hydrogen-oxygen proton exchange membrane fuel cells, which has obvious methanol leakage ( crossover) phenomenon, methanol directly penetrates the Nafion membrane and is lost, resulting in a large loss of methanol fuel and a decrease in the power density of the DMFC. At the same time, methanol seeps into the cathode and reacts on the cathode, causing the cathode catalyst to be poisoned and greatly shortening the battery life; The oxidation rate of the anode surface is slow, and carboxyl species such as CO are strongly adsorbed on the anode surface during the oxidation process, which poisons the electrode and reduces the activity of the electrode.

Although the leakage resistance to methanol has been greatly improved, the leakage problem of methanol has not been completely solved