Polar plate-free micro-methanol fuel cell membrane electrode and preparation method thereof

Abstract

Belonging to the field of proton exchange membrane fuel cells, the invention relates to a polar plate-free micro-methanol fuel cell membrane electrode and a preparation method thereof. The polar plate-free micro-methanol fuel cell membrane electrode is composed of an anode semi-electrode, a proton exchange membrane and a cathode semi-electrode. The anode semi-electrode and the cathode semi-electrode respectively consist of a stainless steel felt, a micropore layer and a catalyst layer in order. The catalyst layer is outside the proton exchange membrane, and the micropore layer and the stainless steel felt are positioned outside the catalyst layer in order. The preparation method comprises: cutting the stainless steel felts into a rectangular shape and cleaning them; blade coating the square areas on surfaces of the stainless steel felts with micropore layer slurries, conducting drying, then daubing catalyst slurries on surfaces of the micropore layers, and carrying out drying so as to obtain the semi-electrodes; and then subjecting the anode semi-electrode, the cathode semi-electrode and the proton exchange membrane to hot pressing, thus obtaining the membrane electrode. According to the invention, current collection plates and diffusion layers are integrated, so that the membrane electrode internal mass transfer resistance is effectively reduced, and the overall structure of a micro-methanol fuel cell is further simplified.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells, and relates to a structure and a preparation method of a micro-methanol fuel cell membrane electrode. Background technique [0002] Micro Direct Methanol Fuel Cell (μDirect Methanol Fuel Cell, μDMFC) is a power generation method that uses methanol as fuel and oxygen as oxidant to directly convert chemical energy into electrical energy through a proton exchange membrane. Methanol fuel cells have high energy conversion efficiency, and the fuel utilization rate is 50-100% higher than that of secondary batteries based on thermal power generation. It is cleaner and more energy-efficient. Moreover, the energy density of methanol fuel is 10-20 times that of ordinary secondary batteries, and it has the potential to be an ideal portable power source. [0003] Micro direct methanol fuel cells can be divided into active and passive. The active type refers to the use of external power to ...

AI Technical Summary

Problems solved by technology

Compared with the two, the active type has higher performance, but the system volume is too large due to the existence of the external fuel supply system; the passive type has lower performance, but the system has a high degree of integration and a simple structure, and is more suitable for making portable power supplies

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