FeNi3 composite nitrogen-doped carbon nanotube bifunctional electrocatalyst prepared from biomass

A nitrogen-doped carbon, electrocatalyst technology, applied in fuel cell type half cells and primary cell type half cells, circuits, electrical components, etc., can solve the problem that the catalyst has a single catalytic function, cannot provide catalytic performance, and is disadvantageous to scale Production and other problems, to achieve the effect of improving catalytic performance, facilitating transmission and low cost

Pending Publication Date: 2022-04-29
YUNCHENG UNIVERISTY +1
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Problems solved by technology

[0005] In order to solve the problems in the prior art, the preparation process of most biomass waste composite FeNi alloys is complicated, the pyrolysis temperature is high, it is not conducive to large-scale production, the phenomenon of metal particle agglomeration is serious, and it cannot provide high catalytic performance. A FeNi prepared from biomass is provided 3 Composite nitrogen-doped carbon nanotube bifunctional electrocatalyst and its preparation method and application
The introduction of iron source and nickel source effectively solves the problem of single catalytic function of the catalyst, thus improving the electrocatalytic performance of the catalyst

Method used

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  • FeNi3 composite nitrogen-doped carbon nanotube bifunctional electrocatalyst prepared from biomass
  • FeNi3 composite nitrogen-doped carbon nanotube bifunctional electrocatalyst prepared from biomass
  • FeNi3 composite nitrogen-doped carbon nanotube bifunctional electrocatalyst prepared from biomass

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preparation example Construction

[0035] (1) Preparation of corn cob activated carbon: Weigh a certain mass ratio of corn cob and KOH, immerse in ultrapure water for 10–12 h, and freeze-dry; the dried sample is calcined at high temperature for 1.5–2.5 h under the protection of nitrogen ; Grind and pulverize the activated product into 2~4mol·L -1 Magnetically stirred in the HCl solution for 2-6 h, centrifuged, washed with water and alcohol in sequence until neutral, and vacuum-dried the sample at 60-90°C overnight to obtain corn cob activated carbon, denoted as AC-X-Y, where X corresponds to the calcination temperature of 700 ~900℃, Y is the mass ratio of KOH to corn cob 1:2~1:5.

[0036] (2) FeNi 3 Preparation of @NCNT catalyst: take a certain mass ratio of AC, melamine prepared in step (1) and FeCl with a certain concentration ratio 3 •6H 2 O and NiCl 2 •6H 2 O was dissolved in ultrapure water, sonicated at room temperature for 60–80 min, and freeze-dried; 2 In the atmosphere, at 700~1000℃, calcined at ...

Embodiment 1

[0040] A kind of FeNi 3 The preparation method of composite nitrogen-doped carbon nanotube bifunctional catalyst comprises the following steps:

[0041] (1) Preparation of corn cob activated carbon: Weigh 100-mesh corn cob and KOH with a mass ratio of 1:4, dissolve them in 200 mL of ultrapure water, soak the above mixture for 10 h, and collect the product after freeze-drying. in N 2 Under the atmosphere, pyrolyze at 800°C for 2 hours, collect the product, grind it and put it into 3 mol•L -1 Magnetically stirred in the HCl solution for 4 h, centrifuged and washed with water and alcohol until neutral, and the washed sample was vacuum-dried overnight at 80°C to obtain corn cob activated carbon AC-800-4.

[0042] (2) FeNi 3 Preparation of @NCNT catalyst: Take 0.2 g of AC-800-4, 0.8 g of melamine, 0.00258 g of FeCl 3 •6H 2 O and 0.00675 g NiCl 2 •6H 2 O was dissolved in 20 mL ultrapure water, sonicated at room temperature for 60 min, and freeze-dried. in N 2 Under protecti...

Embodiment 2

[0045] (1) Preparation of corn cob activated carbon: Weigh 100-mesh corn cob and KOH with a mass ratio of 1:3, dissolve them in 200 mL of ultrapure water, soak the above mixture for 11 h, freeze-dry it and collect the product. in N 2 Under the atmosphere, pyrolyze at 800°C for 2 hours, collect the product, grind it and put it into 3 mol•L -1 Magnetically stirred in a HCl solution for 5 h, centrifuged and washed with water and alcohol until neutral, and the washed sample was vacuum-dried overnight at 80°C to obtain corn cob activated carbon AC-800-X (X=3).

[0046] Take 2 mg of AC-800-X catalyst and disperse in 1 mL of ethanol and 8 μL of 5% Nafion solution, and ultrasonicate for 60 min to obtain a uniformly dispersed suspension. Measure the suspension and drop-coat it on the surface of the glassy carbon electrode with a load of 250 μg / cm 2 , tested after standing for 1h. Using an electrochemical workstation, at 0.1 mol•L -1 The catalyst was tested by linear sweep voltammet...

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Abstract

The invention discloses a FeNi3 composite nitrogen-doped carbon nanotube difunctional electrocatalyst prepared from biomass, and belongs to the technical field of zinc-air battery difunctional electrocatalysts. The catalyst is prepared by taking corncob activated carbon as an organic carbon source, melamine as a nitrogen source and FeCl36H2O and NiCl26H2O as metal sources through a one-step pyrolysis method. The catalyst inherits a three-dimensional porous structure of the corncob, a large number of carbon nanotubes grow on the surface of the corncob, and FeNi alloy particles are wrapped in the carbon nanotubes. The catalyst shows good oxygen catalytic performance and stability in alkaline electrolyte, the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performance of the catalyst is superior to those of current commercial noble metal catalysts, and the ORR performance of the catalyst is even superior to those of most currently reported FeNi alloy bifunctional catalysts. And the used raw materials are wide in source and renewable, the preparation process is simple, and the preparation method has huge development potential in application in biomass cyclic utilization and zinc-air battery directions.

Description

technical field [0001] The invention belongs to the technical field of bifunctional electrocatalysts for zinc-air batteries, in particular to FeNi prepared from biomass 3 Composite nitrogen-doped carbon nanotube bifunctional electrocatalyst and its preparation method and application. Background technique [0002] The environmental problems caused by a large amount of biomass waste every year and the increasingly serious shortage of traditional energy sources have drawn more and more attention to renewable clean energy and its storage and conversion devices. Zinc-air batteries have the advantages of high energy density, environmental protection and safety in use, and are considered to be an energy storage device with great development prospects. The key to restricting the application of zinc-air batteries lies in their slow ORR and OER kinetics. Currently, platinum-based (Pt) catalysts and RuO 2 / IrO 2 It is the most effective catalyst for ORR and OER, but due to the high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/06H01M4/88
CPCH01M4/9041H01M4/9083H01M12/06H01M4/8825
Inventor 弓巧娟赵晓燕范嘉敏
Owner YUNCHENG UNIVERISTY
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