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Gas diffusion electrode and preparation and application thereof

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

Active Publication Date: 2016-05-11
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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  • Gas diffusion electrode and preparation and application thereof
  • Gas diffusion electrode and preparation and application thereof
  • Gas diffusion electrode and preparation and application thereof

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] Mix VulcanXC-72 carbon powder with PTFE and prepare it on the surface of Toray-060 carbon paper by screen printing. The loading of VulcanXC-72 carbon powder is 0.5mg / cm 2 , PTFE loading is 40wt.%;

[0039] (b) Preparation of polyaniline nanorods

[0040] Add 0.183ml aniline (20mmol) in the 1mol / L perchloric acid aqueous solution of 100ml, record as solution A, then add 0.31g ammonium persulfate (13.6mmol) in another 100ml 1mol / L perchloric acid aqueous solution, record It is solution B, solutions A and B are mixed evenly 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, and the gas diffusion layer is placed in the mixed solution, The microporous layer faces the solution, and the other side is sealed, and the surface of the microporous layer of the gas d...

Embodiment 2

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

[0046] The IV curve of the single cell assembled with the gas diffusion electrode as the cathode is as follows: image 3 shown. The structure and composition of the single battery, and the discharge conditions of the single battery 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 The PTFE load is 40wt.%, screen printed on the anode support layer; the anode catalyst layer is 60wt.% Pt / C (JM), where the Pt load is 0.25mg / cm 2 ; Negative electrode is the gas diffusion electrode prepared in embodiment 2; Electrolyte membrane is Nafion212 film; Electrode effective area is 4cm 2 ; The anode, Nafion212 membrane and cathode were hot pressed at...

Embodiment 3

[0051] The difference from Example 1 is that the polymerization reaction temperature is 0° C., and other conditions are the same as in 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 from the figure that the polyaniline nanorods are perpendicular to the surface of the carbon particles, the nanorods are about 250nm in length, about 60nm in diameter, and have a sea urchin-like structure microscopically.

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

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Abstract

A gas diffusion electrode includes a gas diffusion layer and a catalytic layer; the catalytic layer is composed of conductive polymer nanorods and a catalyst attached onto the conductive polymer nanorods; the conductive polymer nanorods in the catalytic layer is vertically grown on the surface of carbon powder particles of a microporous layer in situ to form a sea urchin-shaped structure in microscopic scale; the catalyst is attached onto the surface of the conductive polymer nanorods. Preparation of the gas diffusion electrode includes the steps: (a) preparation of the gas diffusion layer; (b) preparation of the conductive polymer nanorods; and (c) preparation of the catalytic layer. Compared with the prior art, the gas diffusion electrode has a certain network structure formed while the catalyst dispersion effect and the utilization rate are improved; compared with an array ordering structure completely vertical to a basal layer, the network structure enables the collision frequency of gas molecules and the catalyst to be increased; the MEA assembled by the gas diffusion electrode has the battery performance improved when having the same catalyst loading amount. The preparation method is simple and easy to implement and is suitable for mass production. The gas diffusion electrode produced by batch has relatively good consistency.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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
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