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A gas diffusion electrode and its preparation and application

A gas diffusion electrode and gas diffusion layer technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficulty in ensuring uniformity, difficulty in large-scale preparation, and complicated post-processing, so as to improve the dispersion effect and utilization rate. , Improve the efficiency of electrochemical reaction, the effect of improving battery performance

Active Publication Date: 2018-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the above method of preparing ordered MEA, either expensive vapor deposition equipment is used, or templates are required, the post-processing is cumbersome, and it is difficult to ensure uniformity. The above methods are difficult to meet the requirements of large-scale preparation

Method used

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  • A gas diffusion electrode and its preparation and application
  • A gas diffusion electrode and its preparation and application
  • A gas diffusion electrode and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The specific preparation process of the gas diffusion electrode includes:

[0037] (a) Preparation of gas diffusion layer

[0038] After mixing Vulcan XC-72 carbon powder and PTFE, it is prepared on the surface of Toray-060 carbon paper by screen printing. The Vulcan XC-72 carbon powder loading is 0.5mg / cm 2 , PTFE loading is 40wt.%;

[0039] (b) Preparation of polyaniline nanorods

[0040] Add 0.183ml of aniline (20mmol) to 100ml of 1mol / L perchloric acid aqueous solution and record it as solution A, then add 0.31g of ammonium persulfate (13.6mmol) to another 100ml of 1mol / L perchloric acid aqueous solution, record as It is solution B. Solution A and B are evenly mixed at -5°C. Then the concentration of aniline in the mixed solution is 10mmol / L and the concentration of ammonium persulfate is 6.8mmol / L. Put the gas diffusion layer into the mixed solution, The microporous layer faces the solution, and the other side is sealed. The surface of the microporous layer of the gas dif...

Embodiment 2

[0045] The difference from Example 1 is that the polymerization temperature is 0° C., and the aniline concentration is 5 mmol / L. The remaining conditions are the same as in Example 1.

[0046] The IV curve of a single cell assembled with this gas diffusion electrode as the cathode is as follows image 3 Shown. The structure and composition of the single cell and the discharge conditions of the single cell are as follows:

[0047] Single cell structure and composition: the anode support layer is Toray-060 carbon paper; the VulcanXC-72 carbon powder loading in the anode microporous layer is 0.5mg / cm 2 Yes, the PTFE loading is 40wt.%, screen printed on the anode support layer; the anode catalytic layer is 60wt.%Pt / C(JM), and the Pt loading is 0.25mg / cm 2 ; The cathode is the gas diffusion electrode prepared in Example 2; the electrolyte membrane is Nafion212 membrane; the effective area of ​​the electrode is 4cm 2 ; The anode, Nafion212 membrane and cathode are hot pressed at 120°C fo...

Embodiment 3

[0051] The difference from Example 1 is that the polymerization temperature is 0°C, and the other conditions are the same as Example 1. The SEM characterization results of the prepared gas diffusion electrode are shown in figure 2 .

[0052] From figure 2 It can be seen that the polyaniline nanorods are perpendicular to the surface of the carbon particles. The nanorods are about 250nm long and 60nm in diameter, and they have a sea urchin-like structure in the microscopic view.

[0053] The IV curve of a single cell assembled with this as the cathode is as Figure 4 As shown, the structure and composition of the single cell, and the discharge conditions are the same as in Example 2. From Figure 4 It can be seen that the highest power density of a single cell under the same test conditions is 392 milliwatts per square centimeter.

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Abstract

A gas diffusion electrode, comprising a gas diffusion layer and a catalytic layer, the catalytic layer is composed of a conductive polymer nanorod and a catalyst attached thereon; the conductive polymer nanorod in the catalytic layer is grown vertically on the microporous layer in situ On the surface of carbon powder particles, a sea urchin-like structure is formed microscopically; the catalyst is attached to the surface of conductive polymer nanorods. The preparation of the gas diffusion electrode includes: (a) the preparation of the gas diffusion layer; (b) the preparation of the conductive polymer nanorod; (c) the preparation of the catalytic layer. Compared with the prior art, the gas diffusion electrode of the present invention forms a certain network structure while improving the dispersion effect and utilization rate of the catalyst. Compared with the array ordered structure completely perpendicular to the base layer, it increases the gas The collision frequency of molecules and catalysts, whereby the battery performance of the assembled MEA is improved at the same catalyst loading. The preparation method is simple and easy to implement, and is suitable for batch production, and the gas diffusion electrodes prepared in batches have good consistency.

Description

Technical field [0001] The invention belongs to the technical field of fuel cells, and specifically relates to a gas diffusion electrode for a proton exchange membrane fuel cell or an alkaline anion exchange membrane fuel cell; [0002] The invention also relates to a method for preparing the above gas diffusion electrode. technical background [0003] Due to its broad application prospects and environmental friendliness, researchers have conducted in-depth studies on the proton exchange membrane fuel cell, especially its core component MEA (anode diffusion layer, anode catalyst layer, polymer electrolyte membrane, cathode catalyst Layer, cathode diffusion layer), but with the deepening of research, it is found that in the traditional MEA catalytic layer, the electrocatalyst, catalyst carrier, proton conductor polymer (such as Nafion), hydrophilic agent / hydrophobic agent, etc. are arranged disorderly, resulting in The mass transfer resistance in the catalytic layer is relatively l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/94H01M4/90H01M4/88
CPCY02E60/50
Inventor 孙公权付旭东王素力夏章讯
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI