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PtCo@N-GNS catalyst and preparation method and application thereof

A catalyst and solvent technology, applied in the field of PtCo@N-GNS catalyst and its preparation, can solve the problems of large-scale application limitations of Pt/C, and achieve high-scale production value, good catalytic activity, and simple preparation process

Active Publication Date: 2020-11-13
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to issues such as cost and stability, the large-scale application of Pt / C is limited.

Method used

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  • PtCo@N-GNS catalyst and preparation method and application thereof
  • PtCo@N-GNS catalyst and preparation method and application thereof
  • PtCo@N-GNS catalyst and preparation method and application thereof

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preparation example Construction

[0032] The invention provides a method for preparing a low-platinum-loaded PtCo@N-GNS bifunctional catalyst, comprising the following steps:

[0033] Step 1. Synthesize zeolite imidazolate framework material ZIF-8, disperse zinc nitrate hexahydrate and 2-methylimidazole in methanol, the molar ratio of metal salt and ligand is 1:4, the reaction time is 24h, and the stirring speed is 500 rpm; the rotating speed of centrifugation is 8000 rpm, the washing solvent is methanol, and the washing times are three times; the temperature of vacuum drying of the obtained product is 60° C., and the drying time is 12 hours.

[0034] Step 2: Disperse a certain amount of cobalt salt and platinum salt into the solution, add ZIF-8 and mix thoroughly, the stirring reaction speed is 500rpm, and the stirring reaction time is 24h; the centrifugal separation speed is 8000rpm, and the washing solvent is deionized water, washing times three times; the obtained product was vacuum-dried at a temperature ...

Embodiment 1

[0039] (1) Synthesis of ZIF-8

[0040] 4.42g of zinc nitrate hexahydrate and 4.92g of 2-methylimidazole were dissolved in 25mL of methanol to form a clear solution. After the two solutions were uniformly mixed, they were reacted at 500 rpm for 24 hours; centrifuged at 8000 rpm, washed with methanol three times; and the product was vacuum-dried at 60° C. for 12 hours.

[0041] (2) Synthesis of PtCo@ZIF-8

[0042]Disperse 0.01g of potassium chloroplatinate and 0.75g of cobalt nitrate hexahydrate in 50mL of deionized water, while ZIF-8 crystal powder (0.65g) was dispersed in another 50mL of deionized water, and finally the two solutions were fully mixed and stirred for 24h . The product was washed three times with deionized water, and dried under vacuum at 60°C for 12 hours.

[0043] (3) Synthesis of PtCo@N-GNS

[0044] Weigh an appropriate amount of the above product and place it in a tube furnace, under the protection of nitrogen, raise the temperature to 800°C at a heating...

Embodiment 2

[0046] (1) Synthesis of ZIF-8

[0047] 4.42g of zinc nitrate hexahydrate and 4.92g of 2-methylimidazole were dissolved in 25mL of methanol to form a clear solution. After the two solutions were uniformly mixed, they were reacted at 500 rpm for 24 hours; centrifuged at 8000 rpm, washed with methanol three times; and the product was vacuum-dried at 60° C. for 12 hours.

[0048] (2) Synthesis of PtCo@ZIF-8

[0049] Disperse 0.01g of potassium chloroplatinate and 1.0g of cobalt nitrate hexahydrate in 50mL of deionized water, while ZIF-8 crystal powder (0.65g) was dispersed in another 50mL of deionized water, and finally the two solutions were fully mixed and stirred for 24h . The product was washed three times with deionized water, and dried under vacuum at 60°C for 12 hours.

[0050] (3) Synthesis of PtCo@N-GNS

[0051] Weigh an appropriate amount of the above product and place it in a tube furnace, under the protection of nitrogen, raise the temperature to 800°C at a heating...

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Abstract

The invention relates to a PtCo@N-GNS catalyst and a preparation method and application thereof. According to the invention, a zinc metal zeolite imidazole compound is hydrolyzed at room temperature in the presence of Co<2+> and Pt<4+>, and the catalyst is prepared by combining tubular furnace sintering and other processes. The material has the characteristics that more holes are generated by evaporation of zinc metal, so that more active sites are exposed out of the material. In addition, the cobalt-platinum alloy particles wrapped by the graphene layer can effectively inhibit corrosion of the alloy, and the catalytic stability of the material is further improved. The material is modified on a glassy carbon electrode, through cyclic voltammetry and linear sweep voltammetry tests, the optimal quality activity of oxygen reduction and ethanol oxidation of the material is as follows: the process is simple, the cost is low, the catalytic activity and durability of the catalyst are far higher than those of a commercial platinum / carbon catalyst, and the application prospect is good.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a PtCo@N-GNS catalyst and its preparation method and application. Background technique [0002] Fuel cells fueled by hydrogen or small molecular organic compounds are considered to be the most promising candidates for next-generation clean energy systems due to their high energy conversion efficiency and low toxicity. The key to the development of fuel cell technology is to study efficient and stable electrocatalysts for the fuel oxidation reaction at the anode and the oxygen reduction reaction (ORR) at the cathode. It is well known that commercial Pt / C and other noble metal Pt-based catalysts and their alloys are considered to be the most excellent fuel cell electrocatalysts. However, the large-scale application of Pt / C is limited due to issues such as cost and stability. Therefore, the development of low-cost, high catalytic activity catalysts is crucial for the technologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/9041H01M4/9058H01M4/90H01M4/9083H01M4/96H01M4/8825Y02E60/50
Inventor 袁群惠高姣姣陈伊麦桂雅雯
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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