A kind of platinum carbon catalyst and its preparation method and application

A technology of platinum-carbon catalyst and carbon powder, which is applied in the direction of electrical components, battery electrodes, circuits, etc., and can solve the problems of platinum falling off and not solving the problem of reverse electrode

Active Publication Date: 2021-06-04
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the invention did not solve the reverse polarity problem
[0006] Based on the research of the above literature, how to develop a catalyst that can not only solve the problem of platinum falling off from the carrier, but also improve the water flooding resistance of the catalyst, and at the same time solve the problem of reverse pole, has become an urgent problem to be solved at present.

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  • A kind of platinum carbon catalyst and its preparation method and application
  • A kind of platinum carbon catalyst and its preparation method and application

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Embodiment 1

[0063] The present embodiment provides a kind of preparation method of platinum carbon catalyst, comprises the following steps:

[0064] (1) 5g of graphene is placed in 100mL of nitric acid solution with a mass fraction of 40%, reflux at 60°C, magnetically stirred for 4h, the sample is suction filtered, washed until the pH is 4, and vacuum-dried at 80°C to obtain toner;

[0065] (2) Put the carbon powder in 100ml of 30% hydrogen peroxide solution by mass fraction, stir for 2 hours, perform suction filtration, wash until neutral, and dry in vacuum at 100°C to obtain the carbon carrier;

[0066] (3) Take 0.2 g of the carbon carrier obtained in step (2) and place it in 50 mL of chloroplatinic acid solution containing platinum at a concentration of 0.006 g / mL. After ultrasonication for 5 min, add 8 g of isopropanol for emulsification and shearing for 5 min, and add 1.23 g 50ml of 0.1mg / ml sodium formate solution of ascorbic acid, 20g of 0.05wt% graphene dispersion of 0.1wt% ammon...

Embodiment 2

[0074] The present embodiment provides a kind of preparation method of platinum carbon catalyst, comprises the following steps:

[0075] (1) Place 5 g of carbon nanospheres in 100 mL of nitric acid solution with a mass fraction of 56%, reflux at 80 ° C, and magnetically stir for 6 h, filter the sample, wash it to pH 6, and dry it at 60 ° C to obtain toner;

[0076] (2) Put the carbon powder in 134ml of 30% hydrogen peroxide solution and stir for 4h, perform suction filtration, wash to neutrality, and dry at 100°C to obtain the carbon carrier;

[0077](3) Take 0.2 g of the carbon carrier obtained in step (2) and place it in 25 mL of chloroplatinic acid solution containing platinum at a concentration of 0.006 g / mL. After ultrasonication for 10 min, add 14.8 g of n-butanol for emulsification and shearing for 10 min. Add 0.38 20ml of 0.1mg / ml sodium formate solution of g ascorbic acid, 20g of 0.01wt% graphene dispersion of 0.3%wt ammonium carbamate, under the protection of helium...

Embodiment 3

[0079] The present embodiment provides a kind of preparation method of platinum carbon catalyst, comprises the following steps:

[0080] (1) Put 5g of Vulcan XC-72 in 80mL of nitric acid solution with a mass fraction of 42%, reflux at 80°C and magnetically stir for 4h, filter the sample, wash to pH 6, and dry at 70°C. get toner;

[0081] (2) Put the carbon powder in 120ml of 30% hydrogen peroxide solution and stir for 4 hours, perform suction filtration, wash to neutrality, and dry at 100°C to obtain the carbon carrier;

[0082] (3) Take 0.2 g of the carbon support obtained in step (2) and place it in 25 mL of platinum nitrate solution with a platinum concentration of 0.006 g / mL. After ultrasonication for 10 min, add a mixture of 8 g of n-butanol and 6 g of isopropanol to carry out Emulsified and sheared for 8min, added 30ml of 0.1mg / ml sodium formate solution of 1.05g ascorbic acid, 20ml of 0.05wt% graphene dispersion of 0.2wt% ammonium carbamate, under argon protection, ref...

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Abstract

The invention relates to a platinum carbon catalyst and its preparation method and application. The preparation method provided by the invention comprises: (1) mixing carbon material and nitric acid solution, refluxing, separating, and drying to obtain carbon powder; (2) mixing carbon powder and hydrogen peroxide solution, separating, drying, Obtain the carbon carrier; (3) mix the carbon carrier, the platinum-containing solution and the reducing agent, under the protection of an inert atmosphere, reflux, then add a reverse electrode inhibitor for emulsification, microwave treatment, separation, and drying to obtain the platinum carbon catalyst. The method adopts nitric acid-hydrogen peroxide double oxidation to form abundant oxygen-containing functional groups on the surface of the carbon carrier, which are combined with Pt through coordination bonds to solve the problems of poor dispersion, low utilization rate, and easy shedding of Pt; the catalyst provided by the invention It has the characteristics of high ORR activity, strong resistance to reverse polarity, and low performance attenuation. The battery prepared from it has excellent resistance to reverse polarity and high open circuit voltage.

Description

technical field [0001] The invention relates to the technical field of new energy fuel cells, in particular to a platinum-carbon catalyst and its preparation method and application. Background technique [0002] A fuel cell is a device that directly converts chemical energy stored in fuel and oxidant into electrical energy, because it has a wide range of fuel sources, is clean, environmentally friendly, is not limited by the Carnot cycle, has high energy conversion efficiency, and has strong modular structure flexibility. , Centralized power supply can also be decentralized power supply and other advantages, in line with the requirements of sustainable development of the environment and resources, so it is highly valued. Fuel cells have broad application prospects in the fields of power stations, electric vehicles, aerospace, submarines, and space power supplies. Among them, proton exchange membrane fuel cells (PEMFC) have become a key research object in the field of new ene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/8878H01M4/926Y02E60/50
Inventor 于力娜朱雅男裴国权张克金唐柳杨帅
Owner FAW JIEFANG AUTOMOTIVE CO
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