Fe, Ni and N three-doped carbon nanotube coated type FeNi@NCNT catalyst as well as preparation method and application thereof

A technology of carbon nanotubes and catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of difficult separation of nanofibers, low yield, poor strength, etc., and achieve improved electrochemical performance. Activity and stability, high specific surface area and conductivity, effect of inhibiting aggregation

Inactive Publication Date: 2018-09-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nanofibers prepared by electrospinning technology are not easy to separate, the yield is low, and the strength is poor, and the preparation process of the catalyst is complicated, which is not conducive to large-scale preparation.
[0005] In summary, bimetallic-based modified nitrogen-doped carbon materials (MM' / NC) show good potential to catalyze ORR and OER processes, but the preparation process needs to be further simplified

Method used

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  • Fe, Ni and N three-doped carbon nanotube coated type FeNi@NCNT catalyst as well as preparation method and application thereof
  • Fe, Ni and N three-doped carbon nanotube coated type FeNi@NCNT catalyst as well as preparation method and application thereof
  • Fe, Ni and N three-doped carbon nanotube coated type FeNi@NCNT catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: DA-Fe 3 Ni-800 (DA is dicyandiamide, Fe 3 Ni refers to ferric ammonium citrate and NiCl in raw materials 2 ·6H 2 The molar mass ratio of O is 3:1, the molar ratio of DA to metal Fe and Ni is about 40:1, and 800 means the pyrolysis temperature is 800°C)

[0047] 0.1103g of ferric ammonium citrate and 0.0178g of NiCl 2 ·6H 2 Dissolve O in 10mL deionized water to obtain solution A; then weigh 1g of dicyandiamide and dissolve it in a mixed solution of A and 20mL absolute ethanol to obtain solution B, stir in an oil bath at 60°C for 30min to fully dissolve and mix well ; Transfer the uniformly mixed solution B to a petri dish, and dry it in an air drying oven at 60°C for 11 hours to obtain a catalyst precursor; place the dried precursor in a mortar, grind it evenly, place it in a quartz boat, and place it in a nitrogen protection 5°C min -1 Program temperature to 550°C for 1h, then 3°C for min -1 Heat up to 800°C and then calcined for 1 hour, then naturally...

Embodiment 2

[0048] Embodiment 2: DA-FeNi-800 (DA: dicyandiamide, FeNi refers to ferric ammonium citrate and NiCl in the raw material 2 ·6H 2 The molar mass ratio of O is 1:1, the molar ratio of DA to metal Fe and Ni is about 40:1, and 800 refers to the pyrolysis temperature of 800°C)

[0049] 0.0735g of ferric ammonium citrate and 0.0362g of NiCl 2 ·6H 2 Dissolve O in 10mL of deionized water to obtain solution A; then weigh 1g of dicyandiamide and dissolve it in the mixed solution of A and 20mL of absolute ethanol to obtain solution B, stir in an oil bath at 60°C for 30min to fully dissolve and mix evenly; Transfer the uniformly mixed solution B to a petri dish, and dry it in an air drying oven at 60°C for 11 hours to obtain a catalyst precursor; place the dried precursor in a mortar, grind it evenly, and place it in a quartz boat, under nitrogen protection 5°C min -1 Program temperature to 550°C for 1h, then 3°C for min -1 The temperature was raised to 800°C and then calcined for 1 ...

Embodiment 3

[0050] Example 3: DA-FeNi 3 -800 (DA: dicyandiamide, FeNi 3 Refers to ferric ammonium citrate and NiCl in raw materials 2 ·6H 2 The molar mass ratio of O is 1:3, the molar ratio of DA to metal Fe and Ni is about 40:1, and 800 means the pyrolysis temperature is 800°C)

[0051] 0.0367g of ferric ammonium citrate and 0.0535g of NiCl 2 ·6H 2 Dissolve O in 10mL of deionized water to obtain solution A; then weigh 1g of dicyandiamide and dissolve it in the mixed solution of A and 20mL of absolute ethanol to obtain solution B, stir in an oil bath at 60°C for 30min to fully dissolve and mix evenly; Transfer the uniformly mixed solution B to a petri dish, and dry it in an air drying oven at 60°C for 11 hours to obtain a catalyst precursor; place the dried precursor in a mortar, grind it evenly, and place it in a quartz boat, under nitrogen protection 5°C min -1 Program temperature to 550°C for 1h, then 3°C for min -1 Raise the temperature to 800°C and then calcinate for 1 hour, a...

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Abstract

The invention discloses a Fe, Ni and N three-doped carbon nanotube coated type FeNi@NCNT catalyst as well as a preparation method and application thereof, and belongs to the fields of energy materialsand electrochemistry. The catalyst is prepared by using dicyandiamide as a C source and N source and ammonium ferric citrate and NiCl2.6H2O as metal sources, adopting one pot method and performing pyrolysis in two steps; and a plurality of Fe and Ni metal particles in the catalyst are uniformly wrapped in walls of ''bamboo-like'' N-doped carbon nanotubes, and a small number of the particles are distributed at the tip ends of the carbon nanotubes. Compared with a common metal alloy oxygen reduction reaction and oxygen evolution reaction bifunctional catalyst, the catalyst disclosed by the invention exhibits good oxygen evolution reaction activity and stability under alkaline conditions; the preparation method is simple, and raw materials used in the method have low costs and wide sources;and the catalyst can be widely used in the fields of proton exchange membrane fuel cells, electrolyzed water, metal-air batteries and the like, and has higher practical value.

Description

technical field [0001] The invention belongs to the field of energy materials and electrochemistry, and relates to an electrocatalyst and a preparation method applied to fuel cells, electrolyzed water, and metal-air batteries for oxygen reduction reactions and oxygen evolution reactions, and in particular to a Fe, Ni, N triple-doped electrocatalyst Heterocarbon nanotube-coated FeNi@NCNT catalyst, preparation method and application. Background technique [0002] Fuel cells, electrolyzed water, and metal-air batteries have been the research hotspots of domestic and foreign scholars in recent years. However, the slow kinetics of the oxygen electrode reaction (oxygen reduction reaction (ORR) and oxygen evolution reaction (OER)) is a bottleneck problem that greatly limits its rapid development. It is urgent to develop efficient catalysts to increase the reaction rate and reduce the overpotential. At present, Pt-based catalysts are recognized as the catalysts with the best cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02C02F1/461H01M4/90
CPCB01J27/24B01J35/0033B01J35/023C02F1/461H01M4/9041H01M4/9083Y02E60/50
Inventor 李光兰陈文雯袁丽芳杨贝贝徐晓存
Owner DALIAN UNIV OF TECH
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