Self-breathing direct methanol fuel cell

Abstract

The invention provides a self-breathing direct methanol fuel cell which comprises a methanol storage tank, an anode supporting plate, an anode current collecting plate, a membrane electrode, a cathode current collecting plate and a cathode supporting layer which are successively connected. The self-breathing direct methanol fuel cell is characterized in that a supporting plate and a first ventilation plate are sequentially connected between the methanol storage tank and the anode supporting plate; the supporting plate is provided with a fuel filling port and a gas releasing port, and the surface of the supporting plate in connection with the first ventilation plate is provided with a current field; and the first ventilation plate is provided with a fuel filling port and a gas releasing port, the fuel filling port of the supporting plate is communicated with the fuel filling port of the first ventilation plate, and the gas releasing port of the supporting plate is communicated with the gas releasing port of the first ventilation plate. The cell provided by the invention has the advantages that a carbon dioxide semi-enclosed region is formed so as to prevent external oxygen from entering the cell and prevent an anode from being oxidized, the property of the methanol fuel cell provided by the invention is stable, a methanol solution the concentration of which is more than 5M is utilized, and the discharging time is long.

Description

technical field [0001] The invention relates to the field of methanol fuel cells, in particular to a self-breathing direct methanol fuel cell. Background technique [0002] Direct methanol fuel cell is a kind of proton exchange membrane fuel cell, which directly uses methanol solution or steam methanol as the source of fuel supply, without the need for reforming methanol, gasoline or natural hydrogen to generate hydrogen. Direct methanol fuel cells have broad application prospects in portable electronic devices due to their low operating temperature, high specific energy density, simple structure, and good safety. [0003] Among them, the self-breathing direct methanol fuel cell is considered to be the most marketable fuel cell. It uses methanol solution as fuel and oxygen in the air as oxidant to oxidize methanol at the anode of the membrane electrode to release electrons and protons. And carbon dioxide, electrons reach the cathode through the external circuit, protons rea...

AI Technical Summary

Problems solved by technology

Among them, the anode support plate consists of two layers of plates hollowed out into several parallel channels and a diffused breathable membrane between the two plates. The diffused breathable membrane absorbs the methanol solution, and the methanol solution directly contacts the membrane electrode through the channels and the anode collector plate. , when the liquid level of the solution is not enough to submerge the surface of the membrane electrode, the unsubmerged part of the membrane electrode will be exposed to the air, and the anode in the membrane electrode is easily oxidized by air, thereby reducing the stability of the battery

Moreover, it can only use a methanol solution with a concentration of less than 5mol / L

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