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Fuel cell, platinum-carbon catalyst and preparation method of platinum-carbon catalyst

A platinum carbon catalyst, fuel cell technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve the problems of low platinum carbon catalyst preparation efficiency, large catalyst particle size, poor particle dispersion, etc., to overcome the catalyst layer. The effect of thickening, low fabrication cost, high platinum content

Inactive Publication Date: 2016-07-20
SAIC MOTOR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation period of this method is longer, and it takes 3 to 5 days.
[0011] Based on the above, the current preparation methods of platinum-carbon catalysts mainly include inorganic colloid method, impregnation method, gel sol method and precipitation method, etc. The catalysts prepared by these methods have large particle size, poor particle dispersibility, uneven particle size, and relatively harsh reaction conditions. and post-processing difficulties and other problems, the preparation efficiency of platinum carbon catalyst is not high

Method used

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  • Fuel cell, platinum-carbon catalyst and preparation method of platinum-carbon catalyst
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  • Fuel cell, platinum-carbon catalyst and preparation method of platinum-carbon catalyst

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preparation example Construction

[0047] The application provides a method for preparing a platinum-carbon catalyst for a fuel cell, such as figure 1 shown, including the following steps:

[0048] Step S100, dissolving platinum salt solution in ethylene glycol solution to form a first mixed solution.

[0049] This application uses ethylene glycol (EG) solution as the reducing solvent, platinum salt compound as the precursor of platinum (Pt), and the mixture of platinum salt solution and ethylene glycol solution reduces platinum ions to pure platinum metal nanoparticles.

[0050] When using ethylene glycol as a reducing agent to prepare platinum metal particles, ethylene glycol plays an important role in the reaction. It is both a solvent and a weak reducing agent, and it acts as a surfactant to protect the reduced metal particles in the solution. .

[0051] In this step, the ethylene glycol solution is a mixed solution of deionized water and ethylene glycol, and the volume ratio of deionized water and ethyle...

Embodiment 1

[0089] Embodiment one is suitable for preparing platinum-carbon catalysts containing 50 wt% platinum:

[0090] At room temperature (25°C), 2g of platinum chloric acid hexahydrate (H 2 PtCl 6 6H2O, Sigma-adrich company) was formulated into 22.16wt% aqueous solution to form platinum chloric acid solution. 2.860 g of platinum chloride solution was extracted and dissolved in 10 ml of deionized water and 20 ml of ethylene glycol (EG) solution to form a first mixed solution.

[0091] Another 10 ml of deionized water and 20 ml of ethylene glycol solution were taken, and carbon (0.303 g, Kejtenblack) was dispersed in the solution by ultrasonic (instrument model 8892, Core-Parmer Company) to form a carbon suspension.

[0092] The preparation process includes:

[0093] First, add the first mixed solution into the uniform carbon suspension through the dropping funnel. After mixing and stirring evenly, adjust the pH value within the range of 10, raise the temperature to 160°C, and heat...

Embodiment 2

[0100] Example 2 is also suitable for preparing a platinum-carbon catalyst with a platinum content of 50 wt%. The difference from Example 1 is that the pH of the solution is adjusted to about 9 for the first time during the preparation process. At this point, the platinum carbon catalyst obtained:

[0101] After carrying out cyclic voltammetry test to this platinum-carbon particle catalyst, the electrochemical surface area obtained of described platinum-carbon particle catalyst is 58m 2 / gPt;

[0102] After the oxygen reduction test was carried out on the platinum carbon particle catalyst, the mass activity of the oxygen reduction reaction of the platinum carbon particle catalyst was 129mA / mgPt;

[0103] After the stability test of the platinum carbon particle catalyst, the electrochemical surface area loss of the platinum carbon particle catalyst was 15%, and the mass activity of the oxygen reduction reaction decreased to 22%.

[0104] In addition, according to the width of...

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Abstract

The invention relates to a fuel cell, a platinum-carbon catalyst and a preparation method of the platinum-carbon catalyst. The preparation method comprises the following steps of dissolving a platinum salt solution in an ethylene glycol solution to form a first mixed solution; dispersing the first mixed solution in a suspension liquid configured by carbon and ethylene glycol to form a second mixed solution; carrying out heating reflux on the second mixed solution in an alkali environment for first reaction; cooling the second mixed solution and carrying out second reaction in an acid environment; restoring a neutral environment of the second mixed solution, and drying the second mixed solution to obtain the platinum-carbon catalyst. By the preparation method, the preparation efficiency of the platinum-carbon catalyst can be improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell, a platinum-carbon catalyst and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (protonexchangemembranefuelcell, PEMFC) is a new generation of power generation device using hydrogen as fuel. The outstanding advantages of low operating temperature, fast startup at room temperature and long life have become the most promising fuel cell. However, proton membrane fuel cells have been facing two great challenges: stability and high cost. These two challenges are directly related to the electrocatalyst used, since the electrocatalyst mainly determines the redox reaction efficiency of the cathode and thus the catalytic efficiency of the PEMFC and the conversion efficiency of the whole cell. Therefore, research on electrocatalysts has become the main content of PEMFC research. Low cost, high catalytic efficiency, and good s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/92H01M8/10
CPCY02E60/50
Inventor 周红茹陈雪松方亮唐厚闻陈玮山
Owner SAIC MOTOR
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