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Platinum-nickel-cobalt alloy@carbon nanotube composite material, preparation and application thereof

A composite material, carbon nanotube technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficulty in mass preparation, limited catalytic performance, and high cost of oxygen reduction catalyst materials, reaching Simple preparation method, improved activity and stability, and maximized performance advantages

Active Publication Date: 2020-02-11
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a nickel-cobalt alloy@carbon nanotube composite material, its preparation and application, which is obtained by combining the precursor solution of platinum, nickel and cobalt with the metal-organic ligand solution Mixing and then annealing to obtain PtNiCo@CNTs composite materials, thus solving the technical problems of high cost, limited catalytic performance and difficulty in mass production of existing oxygen reduction catalyst materials

Method used

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  • Platinum-nickel-cobalt alloy@carbon nanotube composite material, preparation and application thereof
  • Platinum-nickel-cobalt alloy@carbon nanotube composite material, preparation and application thereof
  • Platinum-nickel-cobalt alloy@carbon nanotube composite material, preparation and application thereof

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preparation example Construction

[0029] The preparation method of a platinum-nickel-cobalt alloy@carbon nanotube composite material provided by the present invention comprises the following steps:

[0030] (1) Mix the precursor solution containing platinum, nickel and cobalt with the metal-organic ligand solution, and a coordination reaction occurs. After the reaction is completed, the solid-liquid separation obtains a metal-organic framework containing platinum, nickel and cobalt, which is washed and dried to obtain Dried metal-organic frameworks;

[0031] (2) Annealing the metal-organic framework obtained in step (1) in a reducing atmosphere, then cleaning with dilute acid, separating and drying to obtain a platinum-nickel-cobalt alloy@carbon nanotube composite material.

[0032] Different from the traditional preparation method of alloy@carbon material, that is, the alloy material is obtained first, and then the carbon material is coated. The present invention mixes the precursor solution of platinum, nick...

Embodiment 1

[0051] Step (1): Preparation of PtNi@ZIF-67:

[0052] 3mmol (873mg) cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and 1mmol (290mg) nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) Dissolved in 20 mL of methanol (A), 12 mmol (984 mg) of 2-methylimidazole was added to another 20 mL of methanol (B), and both solutions were magnetically stirred for 0.5 hours. Chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) 10 mM solution was added to solution A, and then 2-methylimidazole solution (B) was added to the former (A). The subsequent solution was stirred at room temperature for 4 hours. The resulting purple precipitate was collected by centrifugation at 10000 rpm for 5 minutes and washed three times with methanol to remove inactive material from the product. Dry the prepared PtNi@ZIF-67 in vacuum at 70°C for 12h;

[0053] Step (2): Preparation of PtNiCo@CNTs:

[0054] 100mg of PtNi@ZIF-67 was placed in a quartz boat and transferred to a 2 mixed gas tube furnace. Heat the samp...

Embodiment 2

[0066] Step (1): Preparation of PtNi@ZIF-67:

[0067] 2mmol (582mg) cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and 1mmol (290mg) nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) Dissolved in 20 mL of methanol (A), 12 mmol (984 mg) of polyvinylpyrrolidone was added to another 20 mL of methanol (B), and both solutions were magnetically stirred for 0.5 hours. Chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) 10 mM solution was added to solution A, and then polyvinylpyrrolidone (B) was added to the former (A). The subsequent solution was stirred at room temperature for 4 hours. The resulting purple precipitate was collected by centrifugation at 10000 rpm for 5 minutes and washed three times with methanol to remove inactive material from the product. Dry the prepared PtNi@ZIF-67 in vacuum at 70°C for 12h;

[0068] Step (2): Preparation of PtNiCo@CNTs:

[0069] 100mg of PtNi@ZIF-67 was placed in a quartz boat and transferred to a 2 mixed gas tube furnace. Heat the sample ...

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Abstract

The invention belongs to the field of preparation of electro-catalytic materials, and more particularly relates to a nickel-cobalt alloy@carbon nanotube composite material and preparation and application thereof. A precursor solution containing platinum, nickel and cobalt is mixed with a metal organic ligand solution, coordination reaction is carried out, solid-liquid separation is carried out after the reaction is finished to obtain a metal organic framework containing platinum, nickel and cobalt, washing and drying are carried out to obtain a dried metal organic framework; and the obtained metal organic framework is annealed in a reducing atmosphere, cleaning with dilute acid is carried out, separating and drying are carried out to obtain the platinum-nickel-cobalt alloy@carbon nanotubecomposite material. The composite material is used as a catalyst for an electrocatalytic oxygen reduction test, and is prepared into a full cell for a fuel cell test system, and the obtained catalyticperformance and stability are superior to those of the current commercial platinum-carbon catalyst. The preparation method of the material is simple, reaction conditions are mild, cost is low, the concept of green chemistry is met, and large-scale industrial production can be carried out through synthesis of the adopted in-situ organic framework.

Description

technical field [0001] The invention belongs to the field of preparation of electrocatalytic materials, and more specifically relates to a nickel-cobalt alloy@carbon nanotube composite material, its preparation and application. Background technique [0002] Since the 1990s, fuel cells, as a new type of energy conversion device that can continuously convert chemical energy into electrical energy, are a clean and efficient way of energy utilization. With the massive consumption and overexploitation of fossil fuels and primary energy, the development of fuel cells is of great significance for improving the environment and realizing energy sustainability. In addition, the fuel cell also has the following advantages: the energy conversion rate can theoretically reach 80%, low noise, no pollution of discharge, and many types of fuels to choose from. This efficient and clean energy conversion device has attracted more and more attention from governments and research institutions o...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M4/92B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9041H01M4/9083H01M4/921H01M4/926H01M2004/8689Y02E60/50
Inventor 夏宝玉沙明亮
Owner HUAZHONG UNIV OF SCI & TECH
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