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Method for preparing cathode support material for special-shaped direct ethanol fuel cell

A fuel cell cathode and support technology, which is applied in the direction of fuel cells, nanotechnology for materials and surface science, chemical instruments and methods, etc., can solve the problem of reducing shrinkage and deformation, short service life of cathode supports, and difficulty in satisfying the market Needs and other issues to achieve the effect of stable state, improved cycle stability, improved electrochemical performance and service life

Inactive Publication Date: 2019-10-08
郭峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are: due to the self-sintering properties of mesocarbon microspheres, the particles fuse during the sintering process to form a sintered body, the pores after sintering fuse, the small pores fuse to form large pores, and sintering necks appear. It is easy to be deformed and cracked; graphite is added to reduce shrinkage and deformation, and the cathode support made of it has a short service life and is difficult to meet market needs. Therefore, a new material that can replace mesophase carbon microspheres and graphite is needed. Preparation of cathode support

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, a preparation method of a heterogeneous direct ethanol fuel cell cathode support material mentioned in the present invention comprises the following steps:

[0018] 1. Put 6000 parts of diethylene glycol into the reaction kettle Ⅰ, add 50 parts of sodium borohydride into the reaction kettle Ⅰ, control the temperature of the kettle at 35-45°C, turn on the stirring motor to stir, and the stirring speed is 350r / min, so that Sodium borohydride is completely dissolved in diethylene glycol;

[0019] 2. Add 20,000 parts of diethylene glycol into the reaction kettle II, turn on the stirring motor to stir, the stirring speed is 420r / min, control the temperature of the kettle at 35-45°C, add 20 parts of polyvinylpyrrolidone with a molecular weight of 24000 and 425 parts of suboctanoic acid Add tin into the reaction kettle II and stir vigorously for 1.5 hours to dissolve all polyvinylpyrrolidone and stannous octoate in diethylene glycol;

[0020] 3. After that, use ...

Embodiment 2

[0028] Embodiment 2, the preparation method of a heterogeneous direct ethanol fuel cell cathode support material mentioned in the present invention comprises the following steps:

[0029] Put 6000 liters of diethylene glycol into the reaction kettle Ⅰ, add 45 kg of sodium borohydride into the reaction kettle Ⅰ, control the temperature of the kettle at 35-45°C, turn on the stirring motor to stir, and the stirring speed is 350r / min to make borohydrogenation Sodium is all dissolved in diethylene glycol. Add 20,000 liters of diethylene glycol in the reaction kettle II, turn on the stirring motor to stir, the stirring speed is 420r / min, control the temperature of the kettle at 35-45°C, mix 15 kg of polyvinylpyrrolidone with a molecular weight of 24,000 and 400 kg of stannous octoate Add it into the reaction kettle and stir vigorously for 1.5 hours to dissolve all the polyvinylpyrrolidone and stannous octoate in diethylene glycol. Afterwards, use a centrifugal pump to spray the mix...

Embodiment 3

[0037] Embodiment 3, a preparation method of a heterogeneous direct ethanol fuel cell cathode support material mentioned in the present invention, comprising the following steps:

[0038] Put 6000 liters of diethylene glycol into the reaction kettle Ⅰ, add 55 kg of sodium borohydride into the reaction kettle Ⅰ, control the temperature of the kettle at 35-45°C, turn on the stirring motor to stir, and the stirring speed is 350r / min to make the borohydride Sodium is all dissolved in diethylene glycol. Add 20,000 liters of diethylene glycol to the reaction kettle II, turn on the stirring motor to stir, the stirring speed is 420r / min, control the temperature of the kettle at 35-45°C, add 25 kg of polyvinylpyrrolidone with a molecular weight of 24,000 and 450 kg of stannous octoate Add it into the reaction kettle and stir vigorously for 1.5 hours to dissolve all the polyvinylpyrrolidone and stannous octoate in diethylene glycol. Afterwards, use a centrifugal pump to spray the mixed...

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Abstract

The invention relates to a method for preparing a cathode support material for a special-shaped direct ethanol fuel cell. The method has the advantages that polyacrylonitrile serving as a carbon source is added to absolute ethyl alcohol containing nano tin powder, and the polyacrylonitrile and the nano tin powder are evenly mixed in the absolute ethyl alcohol through uniform heating and stirring by a stirring tank; a mixture of the polyacrylonitrile and the nano tin powder is separated out through centrifugal separation and then subjected to low-temperature pyrolysis in a carbonization furnaceat 300 DEG C, the polyacrylonitrile is subjected to dehydrogenation and denitrification cyclization to form a conjugated chain structure, and nano tin particles are evenly distributed in a pyrolyticpolyacrylonitrile matrix; phenolic resin as a coating agent covers the nano-tin-containing polyacrylonitrile matrix, the nano-tin-containing polyacrylonitrile matrix coated with the phenolic resin isheated at 300 DEG C, the phenolic resin as the coating agent forms a coating shell after heating and crosslinking, and accordingly, the nano-tin-containing polyacrylonitrile matrix is stable in the coating shell.

Description

technical field [0001] The invention relates to the preparation of a fuel cell cathode support material, in particular to a preparation method of a heterogeneous direct ethanol fuel cell cathode support material. Background technique [0002] As a new generation of clean energy, Direct Ethanol Fuel Cell (DEFC) has received more and more attention. It has the advantages of clean and efficient, high specific energy, and simple structure. The current research is mainly focused on the single-cell experiment stage, and the cells are mostly flat-shaped structures, which lead to problems such as large size, high cost, and difficulties in fuel transportation and water and heat management of DEFC. Aiming at the deficiency of DEFC of planar direct ethanol fuel cell, a special-shaped direct ethanol fuel cell was prepared. [0003] The anode of the heterogeneous direct ethanol fuel cell (DEFC) adopts graphite plate or graphite tube structure, and the catalyst is a Pt-SnO2 / C catalyst s...

Claims

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Application Information

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IPC IPC(8): C01B32/205B22F9/24B82Y40/00B82Y30/00H01M8/0273
CPCC01B32/205B22F9/24B82Y40/00B82Y30/00H01M8/0273Y02E60/50
Inventor 郭峰张润泽刘森瑞张媛媛刘岩
Owner 郭峰
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