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Platinum-cobalt alloy catalyst and preparation method thereof

A platinum-cobalt alloy and platinum-carbon catalyst technology, which is applied in the field of materials, can solve the problem of high platinum consumption and achieve the effects of low cost, low energy consumption and good pre-freezing effect

Active Publication Date: 2020-05-01
SUZHOU HYDROGINE POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiment of the present application is to provide a platinum-cobalt alloy catalyst and its preparation method, which aims to improve the problem of high platinum consumption in the existing platinum-cobalt alloy catalyst

Method used

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  • Platinum-cobalt alloy catalyst and preparation method thereof
  • Platinum-cobalt alloy catalyst and preparation method thereof
  • Platinum-cobalt alloy catalyst and preparation method thereof

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preparation example Construction

[0035] A preparation method of a platinum-cobalt alloy catalyst, comprising:

[0036] After uniformly mixing the cobalt salt, the platinum-carbon catalyst and the volatile solvent, the temperature is lowered to -70°C to -20°C within 2 hours for pre-freezing, and then vacuum-dried in the range of -50°C to 80°C to obtain the platinum-cobalt precursor;

[0037] The platinum-cobalt precursor is reduced at 200-400° C. under a reducing atmosphere for 1-6 hours at a low temperature, and then heat-treated at a high temperature at 500-900° C. under a reducing atmosphere for 1-3 hours.

[0038] In the examples of the present application, the cobalt salt, platinum carbon catalyst and volatile solvent were evenly mixed, pre-frozen, and then vacuum freeze-dried to remove the solvent, so that the cobalt salt was placed on the surface of the platinum carbon catalyst in situ to avoid Migration and agglomeration of cobalt salts, platinum-cobalt precursors are reduced at a low temperature of 20...

Embodiment 1

[0077] This embodiment provides a platinum-cobalt alloy catalyst, which is mainly prepared through the following steps:

[0078] 1) Disperse 1g of carbon carrier in 200mL of ethylene glycol, add 2.63g of chloroplatinic acid, ultrasonically disperse for 120min, and obtain the first suspension after mechanical rotation and stirring.

[0079] 2) The first suspension was mechanically stirred at room temperature, and the pH value was adjusted to 11 with sodium hydroxide to obtain the second suspension.

[0080] 3) The second suspension was irradiated with 2000w microwave for 500s, washed with deionized water, and vacuum-dried at 80°C to obtain a Pt / C catalyst.

[0081] 4) Dissolve 0.305g of cobalt chloride in ethanol, and ball-mill the Pt / C catalyst prepared in step 3) at 250r / min for 150min, then pre-freeze at -70°C for 2h, and use 5°C / h under the condition of absolute vacuum 30Pa The heating rate is to raise the temperature of the partition plate of the freeze dryer from -50°C t...

Embodiment 2

[0085] This embodiment provides a platinum-cobalt alloy catalyst, which is mainly prepared through the following steps:

[0086] 1) Disperse 1g of carbon carrier in 100mL of ethylene glycol, add 6.14g of chloroplatinic acid, ultrasonically disperse for 240min, and obtain the first suspension after mechanical rotation and stirring;

[0087] 2) The first suspension was mechanically stirred at room temperature, and the pH value was adjusted to 14 with sodium hydroxide to obtain a second suspension.

[0088] 3) The second suspension was irradiated with a microwave at 500w for 900s, washed with deionized water, and vacuum-dried at 80° C. to obtain a Pt / C catalyst.

[0089] 4) Dissolve 1.059g of cobalt acetate in ethanol, and ball mill with the Pt / C catalyst prepared in step 3) at a speed of 750r / min for 30min, then pre-freeze at -40°C for 2h, and then freeze it at 5°C / h heating rate to raise the temperature of the freeze dryer partition from -40°C to -5°C, and keep it at -5°C for...

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Abstract

The invention relates to the field of materials and particularly relates to platinum-cobalt alloy catalyst and a preparation method thereof. The preparation method comprises steps of uniformly mixingcobalt salt, platinum-carbon catalyst and volatile solvent, reducing the temperature to -70 DEG C to -20 DEG C within 2 hours for pre-freezing, and then performing vacuum freeze-drying within the range of -50 DEG C to 80 DEG C to obtain a platinum-cobalt precursor; reducing the platinum-cobalt precursor for 1-6 h at the low temperature of 200-400 DEG C and under the reducing atmosphere, and then performing high-temperature heat treatment for 1-3 h at the temperature of 500-900 DEG C and under the reducing atmosphere. The method is advantaged in that the size of platinum particles in the platinum-cobalt alloy catalyst can be well controlled, so the platinum-cobalt alloy particles are uniformly settled on an outer surface of a carbon carrier; when the obtained platinum-cobalt alloy catalystis utilized for a film electrode, the high power density of the film electrode can be realized, the use amount of platinum in the film electrode is greatly reduced, and cost of the film electrode is effectively reduced.

Description

technical field [0001] The present application relates to the field of materials, in particular to a platinum-cobalt alloy catalyst and a preparation method thereof. Background technique [0002] Hydrogen fuel cells can use hydrogen to directly convert chemical energy into electrical energy, and have the characteristics of high power density and fast start-up. The fuel cell membrane electrode is the core component of the fuel cell, and the active component of the catalyst used in the membrane electrode is Pt (platinum). To reduce the cost of the catalyst and improve the catalytic efficiency, cobalt and platinum have been used to form an alloy catalyst to improve the utilization rate of platinum. [0003] The purpose of this application is to provide a catalyst to reduce the amount of platinum used in membrane electrodes. Contents of the invention [0004] The purpose of the embodiment of the present application is to provide a platinum-cobalt alloy catalyst and a preparat...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M8/1004
CPCH01M4/921H01M4/926H01M8/1004Y02E60/50Y02P70/50
Inventor 黄玉平范书琼米诗阳吴丹高志超王秀张晓华朱威
Owner SUZHOU HYDROGINE POWER TECH CO LTD
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