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A kind of direct methanol fuel cell catalyst and preparation method thereof

A methanol fuel cell and catalyst technology, applied in fuel cells, battery electrodes, electrochemical generators, etc., can solve the problems of reducing membrane electrode performance, catalytic layer collapse, increasing catalyst dosage, etc., to achieve load uniformity and combination Improvement of force, increase of content and effective life time, increase of loading rate and adhesion effect

Active Publication Date: 2022-06-07
苏州钧峰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

[0005] (1) The adhesion between metal platinum particles and carbon support will decrease with the use of the battery, which will eventually lead to the occurrence of catalyst agglomeration, resulting in a reduction in the life of the membrane electrode;
[0006] (2) The electrochemical corrosion resistance of the carbon carrier will become weaker and weaker with the use of the battery, and finally the carbon carrier will be electrochemically corroded, resulting in the collapse of the catalytic layer, resulting in a decrease in the performance of the membrane electrode;
[0007] (3) The surface area of ​​the carbon carrier is small, which affects the rate of the gas-liquid-solid three-phase reaction, reduces the contact surface between the catalyst platinum atom and hydrogen, cannot improve the catalytic efficiency of metal platinum, and causes waste of precious metal platinum to a certain extent;
[0008] (4) Due to the low catalyst efficiency, in order to achieve the required power density, the amount of catalyst will be increased, thereby increasing the thickness of the catalytic layer, increasing the internal resistance of the membrane electrode, reducing the performance of the membrane electrode, and causing The output power of the stack drops

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  • A kind of direct methanol fuel cell catalyst and preparation method thereof

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Embodiment 1

[0024] A direct methanol fuel cell catalyst, the catalyst is activated carbon containing platinum and indium supported, wherein the BET surface area of ​​the activated carbon carrier is 800-1000 m 2 / g, the loading rate on the activated carbon carrier was 3.6 wt %, and the mass ratio of platinum and indium content was 1.7:1.

[0025] The direct methanol fuel cell catalyst is prepared as follows: using vacuum magnetron sputtering, using platinum indium alloy as a target, sputtering an alloy metal layer on an activated carbon carrier with a thickness of 2-4 nm; then at 200 ° C in an inert atmosphere ( Dry under argon or nitrogen, the same below) for 30min; after taking out, pulverize and ball mill into loaded carbon particles, the particle size is 4-5μm, and the BET surface area is 1200-1700m 2 / g, and then sent to a carbonization furnace, carbonized at a high temperature of 1000 °C for 50 minutes under an inert atmosphere, and obtained.

[0026] The preparation method of plati...

Embodiment 2

[0028] A direct methanol fuel cell catalyst, the catalyst is activated carbon containing platinum and indium supported, wherein the BET surface area of ​​the activated carbon carrier is 800-1000 m 2 / g, the loading rate on the activated carbon carrier was 2.2 wt %, and the mass ratio of the platinum and indium content supported was 2.1:1.

[0029] The platinum and indium are selected from platinum-indium alloys, and the platinum-indium alloys also contain 3wt% of La and Sr, and the molar ratio of the two is 3:1.

[0030] The direct methanol fuel cell catalyst is prepared as follows: using vacuum magnetron sputtering, using platinum indium alloy as a target, sputtering an alloy metal layer on an activated carbon carrier with a thickness of 2-4 nm; then at 200 ° C in an inert atmosphere ( Argon or nitrogen, the same below), dry for 20min; after taking out, pulverize and ball-mill into loaded carbon particles, the particle size is 4-5μm, and the BET surface area is 1200-1700m 2 ...

Embodiment 3

[0033] A direct methanol fuel cell catalyst, the catalyst is activated carbon containing platinum and indium supported, wherein the BET surface area of ​​the activated carbon carrier is 800-1000 m 2 / g, the loading rate on the activated carbon carrier was 4.2 wt %, and the mass ratio of the platinum and indium content supported was 2.6:1.

[0034] The platinum and indium are selected from platinum-indium alloys, and the platinum-indium alloys also contain 5wt% of La and Sr, and the molar ratio of the two is 1:1.

[0035] The direct methanol fuel cell catalyst is prepared as follows: using vacuum magnetron sputtering, using platinum indium alloy as a target, sputtering an alloy metal layer on an activated carbon carrier with a thickness of 2-4 nm; Dry under argon or nitrogen, the same below) for 60min; after taking out, pulverize and ball mill into loaded carbon particles, the particle size is 4-5μm, and the BET surface area is 1200-1700m 2 / g, and then sent to a carbonization ...

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Abstract

The invention proposes a direct methanol fuel cell catalyst and a preparation method thereof. The catalyst is activated carbon containing platinum and indium, wherein the BET surface area of ​​the activated carbon carrier is 800-1000m 2 / g, the loading rate on the activated carbon carrier is 1.8-4.2wt%, and the mass ratio of the loaded platinum and indium content is 1.3-2.8:1. The present invention adopts platinum and indium as the main catalytic noble metals, and uses activated carbon particles as the carrier. The type of precious metal, the addition ratio and the process parameters have effectively improved the loading rate and adhesion of the catalytic active ingredients, the structure and function are stable, and the comprehensive catalytic efficiency has been significantly improved.

Description

technical field [0001] The invention relates to the technical field of methanol fuel cells, in particular to a direct methanol fuel cell catalyst and a preparation method thereof. Background technique [0002] As an efficient and environmentally friendly power generation device, fuel cells have broad application prospects in base station power sources, small and medium-sized power stations, electric vehicles, backup power sources, and portable power sources. Fuel cells can be divided into proton exchange membrane fuel cells, direct methanol fuel cells, alkaline fuel cells, solid oxide fuel cells, molten salt fuel cells, microbial fuel cells, biofuel cells, and the like. [0003] A direct methanol fuel cell (DMFC) is a power generation device that uses methanol as fuel and converts the chemical energy stored in the fuel into electrical energy under the action of an electrocatalyst to perform external work. It has the characteristics of high theoretical specific energy densit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M8/1011C23C14/18C23C14/35
CPCY02E60/50
Inventor 王慧
Owner 苏州钧峰新能源科技有限公司