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Electrode with progressive structure of proton exchanging film fuel battery and method for making the same

A proton exchange membrane and fuel cell technology, which is applied to fuel cell components, solid electrolyte fuel cells, battery electrodes, etc., can solve the problems of high gas transfer resistance and low catalyst utilization rate, and reduce mass transfer resistance, Enhanced gas channel continuity and reduced gas transfer resistance

Active Publication Date: 2008-06-18
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a proton exchange membrane fuel cell electrode with a progressive structure and a manufacturing method thereof in view of problems such as low catalyst utilization rate and relatively large gas transfer resistance in the electrode existing in the existing electrode technology

Method used

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  • Electrode with progressive structure of proton exchanging film fuel battery and method for making the same
  • Electrode with progressive structure of proton exchanging film fuel battery and method for making the same

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Embodiment Construction

[0025] 1. Take Toray carbon paper and dip it in 3% PTFE emulsion to increase it to 8%. Baking at 340°C in a firing furnace.

[0026] 2. Mix acetylene black, pore-forming agent, PTFE and isopropanol, and stir evenly in an ultrasonic wave, and apply the above mixture evenly on the surface of the carbon paper. The amount of carbon powder in the ingredients is 1.0mg / cm 2 , PTFE accounts for 30% of the total, pore-forming agent accounts for 50%, and isopropanol is in an appropriate amount.

[0027] 3. Mix 40% Pt / C catalyst, pore-forming agent, PTFE and isopropanol, stir evenly in ultrasonic wave, and apply it to the completed leveling layer by hand. The amount of catalyst is 0.5mg / cm 2 , PTFE accounts for 30% of the total, and pore-forming agent accounts for 50%. The prepared hydrophobic electrode was baked at a constant temperature of 340° C. for 40 minutes.

[0028] 4. Spray the uniformly mixed material of 50% Pt / C catalyst, 5% Nafion solution and isopropanol onto the hydrop...

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Abstract

The invention provides an electrode with a progressive structure of a proton exchange membrane fuel cell and a preparation method. The electrode consists of a supporting layer, a leveling layer and a catalyzing layer; a strong-hydrophobic macropore layer is the supporting layer; a weak-hydrophobic mesopore layer is above the strong-hydrophobic macropore layer; a weak-hydrophobic mesopore catalyzing layer is above the weak-hydrophobic mesopore layer; a hydrophile micropore catalyzing layer is above the weak-hydrophobic mesopore catalyzing layer; wherein, the weak-hydrophobic mesopore layer comprises the weak-hydrophobic mesopore catalyzing layer in the leveling layer and the catalyzing layer. The invention has the advantages that the electrode catalyzing layer consists of progressive multilayer structure of hydrophile and hydrophobe, the shortage is overcome of low utilization ratio of catalyst in the hydrophobic catalyzing layer, and the transmission effect of reaction gas, especially an air oxidant in the catalyzing layer is improved; a pore-forming agent which is introduced in the electrode improves the porous structure of the levelling layer and the catalyzing layer of the electrode, forms an progressive structure of pore, reduces the mass transfer resistance in the reaction process, and improves the performance of the electrode.

Description

technical field [0001] The invention relates to an electrode assembly of a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] The core component of the proton exchange membrane fuel cell is the membrane electrode (MEA), which is composed of the proton exchange membrane and the cathode and anode electrodes. These components are generally prepared in steps and then pressed together at high temperatures. According to the structure of the catalytic layer, the electrodes can be divided into hydrophobic electrodes and hydrophilic electrodes. [0003] Hydrophobic electrode is currently the most widely used electrode. In the prior art, the preparation process of the hydrophobic electrode is as follows: after mixing the Pt / C catalyst and PTFE, spraying or coating it on the surface of the treated carbon paper, after heat treatment, then impregnating it with Nafion solution, and drying it. The disadvantage of this electrode is that alt...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/02H01M4/88H01M8/10
CPCY02E60/521Y02E60/50
Inventor 侯中军赵恩介薛馨伟王金中
Owner SUNRISE POWER CO LTD
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