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

A methanol fuel cell and membrane electrode technology, which is applied in the direction of fuel cells, battery electrodes, fuel cell components, etc., can solve the problems of large volume, achieve the effect of improving performance, increasing power density, and simplifying the overall structure of the battery

Inactive Publication Date: 2013-04-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 pa

Method used

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

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specific Embodiment approach 1

[0019] Specific implementation mode one: as figure 1 As shown, the electrodeless plate micro-methanol fuel cell membrane electrode of this embodiment is composed of an anode stainless steel felt half electrode, a proton exchange membrane 4 and a cathode stainless steel felt half electrode, and the anode stainless steel felt half electrode is composed of an anode stainless steel felt 1, an anode micropore layer 2 and anodic catalytic layer 3, the anode catalytic layer 3 is located on the left side of the proton exchange membrane 4, the left side of the anode catalytic layer 3 is followed by the anode microporous layer 2 and the anode stainless steel felt 1, and the cathode stainless steel felt half electrode consists of The cathode catalytic layer 5, cathode microporous layer 6 and cathode stainless steel felt 7 are composed. The cathode catalytic layer 5 is located on the right side of the proton exchange membrane 4, and the right side of the cathode catalytic layer 5 is the ca...

specific Embodiment approach 2

[0022] Specific implementation mode 2: In this implementation mode, a non-polar plate micro-methanol fuel cell membrane electrode is prepared according to the following method:

[0023] 1. Cutting and cleaning of stainless steel felt:

[0024] Cut the stainless steel felt into a rectangle that matches the size of the fixture, ultrasonically clean it with ultrapure water for 5 minutes to remove water-soluble dirt, then ultrasonically clean it with anhydrous ethanol solution for 30 minutes to remove organic surface dirt, and then dry it at 80°C.

[0025] 2. Preparation of microporous layer slurry:

[0026] Add a certain amount of PTFE into the ethylene glycol solvent and ultrasonically vibrate for 5 minutes, then add nano-scale carbon powder 5 to 9 times the mass of PTFE, and add an appropriate amount of ethylene glycol to completely immerse the carbon powder. The slurry in the test tube was stirred with a magnetic stirrer for 1 min, then ultrasonically oscillated for 30 min, t...

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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 ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M8/02H01M8/1004H01M8/1011
CPCY02E60/50
Inventor 张雪林李洋张宇峰刘晓为金憾尘沈骞
Owner HARBIN INST OF TECH
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