Direct methanol fuel cell catalyst and preparation method thereof

A methanol fuel cell and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve problems such as high cost, poor catalytic activity, and complicated preparation methods

Active Publication Date: 2012-12-05
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Abstract
  • Description
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Problems solved by technology

Since the nitrogen-doped carbon material does not contain metal elements, it can effectively solve the problems of catalyst oxidation and carbon monoxide poisoning caused by

Method used

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  • Direct methanol fuel cell catalyst and preparation method thereof
  • Direct methanol fuel cell catalyst and preparation method thereof
  • Direct methanol fuel cell catalyst and preparation method thereof

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[0044] The present invention also provides a method for preparing a direct methanol fuel cell catalyst, comprising the following steps: A) mixing carbon black with ammonium fluoride, heating for pyrolysis reaction, and continuing heating for fluorine doping reaction to obtain fluorine doping reaction carbon black material, the mass ratio of carbon black to ammonium fluoride is 2.5~500:1, preferably 2.5~300:1, more preferably 2.5~100:1; B) the carbon doped with fluorine The black material is mixed with melamine, heated for pyrolysis reaction, and then heated for nitrogen doping reaction to obtain a direct methanol fuel cell catalyst. The mass ratio of the fluorine-doped carbon black material to melamine is 1 to 660:1, preferably It is 1~400:1, more preferably 1~200:1.

[0045] Wherein, in step A, ammonium fluoride is used as the fluorine source, and ammonium fluoride is decomposed into ammonia gas and hydrogen fluoride under high temperature conditions, which is beneficial to t...

Embodiment 1

[0057] 1.1 Dissolve 0.14g ammonium fluoride in 30.0ml water, stir until dissolved, add 0.35g acetylene carbon black, ultrasonically disperse for 30min, stir for 24h, centrifuge at 10000rpm / min for 10min, discard the supernatant, the obtained black The precipitate was dried at 60°C. The obtained mixture was ground for 30 minutes, heated to 400° C. for 6 hours, and then heated to 800° C. for 5 hours to obtain fluorine-doped acetylene carbon black.

[0058] 1.2 Grind 0.1g of the fluorine-doped acetylene carbon black obtained in 1.1 with 0.1g of melamine for 30 minutes, heat up to 400°C for 6 hours, then continue to heat up to 800°C for 5 hours to obtain fluorine-nitrogen co-doped acetylene carbon black .

[0059] 1.3 Ultrasonic disperse 5 mg of fluorine and nitrogen co-doped acetylene carbon black obtained in 1.2 with 100 μl Nafion solution for 30 minutes to obtain a solution; take 10 μl of the solution and drop-coat it on a rotating disk electrode, and dry it at room temperatur...

Embodiment 2

[0066] 2.1 Dissolve 0.2g of ammonium fluoride in 30.0ml of water, stir until dissolved, add 0.35g of Activated carbon Vulcan XC-72 (Cabot Corporation), ultrasonically disperse for 30min, stir for 24h, then vacuum filter and dry. The obtained mixture was ground for 30 minutes, heated to 400°C for 0.5 hours in a single-temperature zone slide rail furnace, and then heated to 900°C for 1 hour to obtain fluorine-doped activated carbon Vulcan XC-72.

[0067] 2.2 Grind 0.1g of the fluorine-doped Activated carbon Vulcan XC-72 obtained in 2.1 with 0.1g of melamine for 30min, heat up to 400°C for 0.5h, then continue to heat up to 900°C for 1h to obtain fluorine-nitrogen co-doping Activated carbon Vulcan XC-72.

[0068] 2.3 Ultrasonic disperse 5 mg of fluorine nitrogen co-doped Activated carbon Vulcan XC-72 obtained in 2.2 with 100 μl Nafion solution for 30 minutes to obtain a solution; take 10 μl of the solution and drop-coat it on a rotating disk electrode, and dry it at room temperatu...

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Abstract

The invention provides a direct methanol fuel cell catalyst and a preparation method thereof. The direct methanol fuel cell catalyst comprises carbon black, and fluorine and nitrogen which are doped in the carbon black, wherein the fluorine accounts for 0.1-20% of the weight of the direct methanol fuel cell catalyst and the nitrogen accounts for 0.1-20% of the weight of the direct methanol fuel cell catalyst. Compared with the conventional nitrogen-doped nonmetal oxygen reduction catalyst, the direct methanol fuel cell catalyst takes the carbon black as a carbon material which is sequentially doped with fluorine atoms and nitrogen atoms, and has the advantages as follows: firstly, the fluorine atoms and the nitrogen atoms have different electronegativity from oxygen, and the fluorine atoms have relatively large electronegativity and have a relatively strong electron-withdrawing property, so that synergy of the fluorine atoms and the nitrogen atoms can weaken the bond energy of chemical bonds between oxygen atoms in an oxygen molecule and can increase the speed rate of an oxygen reduction reaction; secondly, the synergy of the fluorine atoms and the nitrogen atoms also can affect the electron distribution of the carbon black, change the bond valence way of carbon atoms and improve the catalytic activity of the catalyst in the oxygen reduction reaction; and finally, the carbon black has low micropore content, so that the direct methanol fuel cell catalyst can facilitate transportation of reactants and is simple in preparation method and relatively low in cost.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a direct methanol fuel cell and a preparation method thereof. Background technique [0002] A fuel cell is an energy conversion device that can convert chemical energy into electrical energy through redox reactions at the anode and cathode. It has the characteristics of low operating temperature, high energy efficiency, and no electrolyte corrosion. a research hotspot. According to different electrolytes, fuel cells can be divided into alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells and proton exchange membrane fuel cells. Direct methanol fuel cell is developed from proton exchange membrane fuel cell. It has the advantages of high power density, high energy conversion efficiency, and easy to carry and store fuel. It is an ideal portable and mobile energy source. However, a serious technical problem in its use is...

Claims

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Application Information

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IPC IPC(8): H01M4/90B01J27/24
CPCY02E60/50
Inventor 徐维林孙秀娟张玉微邢巍
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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