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Composite carbon fiber-loaded metal catalyst as well as preparation method and application thereof

A metal catalyst and composite carbon fiber technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high conductivity and high proton conductivity, reduce catalyst conductivity, high catalytic activity, etc., to achieve improved performance, good metal Effects of dispersibility and high electronic conductivity

Inactive Publication Date: 2014-07-09
上海氢尚新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When this method introduces cationic polymers, it will also reduce the conductivity of the catalyst to a certain extent, and a good catalyst carrier not only requires high catalytic activity, but also high conductivity and high proton conductivity.

Method used

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  • Composite carbon fiber-loaded metal catalyst as well as preparation method and application thereof
  • Composite carbon fiber-loaded metal catalyst as well as preparation method and application thereof
  • Composite carbon fiber-loaded metal catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Put 100mg of carbon fiber (CF) containing multi-armed carbon nanotube (MWCNT) additive into 0.2M sulfuric acid solution of potassium permanganate, the concentration of sulfuric acid is 0.5M, and stir at 40°C for more than 3h , preparing a composite carbon fiber (M-CF) uniformly loaded with spherical manganese dioxide;

[0054] (2) Put the M-CF uniformly loaded with spherical manganese dioxide obtained in (1) into a vacuum oven at 70°C and dry for 6 hours.

[0055] (3) The dried M-CF uniformly loaded with spherical manganese dioxide obtained in (3) is loaded into a ceramic boat, and placed in a quartz tube furnace to carry out a high-temperature catalytic process of carbon material graphitization, and the carbonization temperature is 850°C , the carbonization time is 3 hours, the atmosphere is a hydrogen-argon mixture, and the heating rate is 2 / min, so that the high degree of graphitization M-CF with uniform spherical manganese dioxide is obtained.

[0056] (4) Put ...

Embodiment 2

[0058] (1) Put 100mg of carbon fiber (CF) into a sulfuric acid solution of 0.5M potassium permanganate, the concentration of sulfuric acid is 0.4M, and stir at 30°C for more than 2 hours to prepare CF loaded with spherical manganese oxide uniformly;

[0059] (2) Put the graphene uniformly loaded with spherical manganese oxide obtained in (1) into a vacuum oven at 55° C., and dry for 10 h.

[0060] (3) The dry CF obtained in (3) loaded uniformly with spherical manganese oxide is loaded into a ceramic boat, and placed in a quartz tube furnace to carry out a high-temperature catalytic process of carbon material graphitization. The carbonization temperature is 900 ° C, and the carbonization time is 2h, the atmosphere is a hydrogen-argon mixture, and the heating rate is 2 / min, so as to obtain the high degree of graphitization CF of uniformly loaded spherical manganese oxide.

[0061] (4) Put 100 mg of CF with a high degree of graphitization uniformly loaded with spherical manganese...

Embodiment 3

[0063] (1) Put 100 mg of carbon fibers (CF) containing single-arm carbon nanotubes (SWCNT) into a sulfuric acid solution of 0.5M potassium dichromate, the concentration of sulfuric acid is 0.4M, and stir at 50°C for more than 1h, A carbon fiber (S-CNF) compounded with single-arm carbon tubes uniformly loaded with spherical chromium oxide is prepared;

[0064] (2) Put the S-CF uniformly loaded with spherical chromium oxide obtained in (1) into a vacuum oven at 55°C and dry for 10 hours.

[0065] (3) The dried S-CF uniformly loaded with spherical chromium oxide obtained in (3) is loaded into a ceramic boat, and placed in a quartz tube furnace to carry out a high-temperature catalytic process of carbon material graphitization. The carbonization temperature is 800 ° C. The carbonization time is 5 hours, the atmosphere is pure argon, and the heating rate is 4 / min, so that the high graphitization degree SWCNT uniformly loaded with spherical chromium oxide can be obtained.

[0066] ...

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Abstract

The invention relates to a composite carbon fiber-loaded metal catalyst as well as a preparation method and application thereof. The composite carbon fiber-loaded metal catalyst is high in graphitization degree, good in catalyst metal particle dispersion performance and excellent in catalytic performance and is prepared by adopting a transitional metal oxide as a graphitization enhancer of a carbon material and a metal dispersion loading induction agent. The prepared composite carbon fiber material loaded with the transitional metal oxide is catalyzed through the transitional metal oxide under the high temperature condition to obtain a carbon material with a high graphitization degree, and the transitional metal oxide composite carbon fiber material is used as a catalyst carrier to be reduced by a reduction agent. The catalyst is high in initial electrochemical activity surface area and good in duration, and after the catalyst is cycled for 4500 times, the electrochemical active surface area sill can be maintained at 54 percent. The current density attenuation is reduced in a timing current-method electrochemical test of 120 minutes, the electrochemical activity is high, the current density is high, and the duration is excellent.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to transition metals or their oxides catalyzed graphitization of carbon fibers and induce dispersed metal catalysts and their preparation methods and applications, in particular to transition metals or their oxides catalyzed graphitization of carbon fibers for fuel cells And induce the dispersion of metal-loaded catalysts. Background technique [0002] A fuel cell is a green, high-efficiency energy conversion device that directly converts the chemical energy of fuel into electrical energy without burning it. The preparation of catalysts with high catalytic activity, good durability and low cost is one of the key factors for the commercialization of fuel cells. Carbon support plays a very important and even crucial role in the performance of polymer membrane fuel cell catalysts. At present, catalyst supports are mainly based on carbon materials. Among them, graphitized carbon black, acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9016H01M4/9041H01M4/9083H01M4/96Y02E60/50
Inventor 王超楠张永明袁望章李虹陈晓红
Owner 上海氢尚新能源科技有限公司
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