Multistage carbon nanostructure anchored Ni-N4 monatomic catalyst as well as preparation method and application thereof

A carbon nanostructure and catalyst technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of difficult control of particle size on the surface of catalysts, uneven particle distribution, low atom utilization, etc., to achieve easy promotion and The effect of large-scale production, simple and effective preparation process, and excellent catalytic performance

Active Publication Date: 2020-06-02
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface particle size of these catalysts is difficult to control, the particle distribution is not uniform, and agglomeration is prone to occur during the preparation process, resulting in low atom utilization.

Method used

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  • Multistage carbon nanostructure anchored Ni-N4 monatomic catalyst as well as preparation method and application thereof
  • Multistage carbon nanostructure anchored Ni-N4 monatomic catalyst as well as preparation method and application thereof
  • Multistage carbon nanostructure anchored Ni-N4 monatomic catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Mix 570mg of EMIM-dca with 100mg of nickel nitrate and stir magnetically at room temperature (25°C) for 12h to form a homogeneous blue mixture; place the mixture in a tube furnace and pyrolyze it for 2h at 1000°C under an argon atmosphere (heating rate is 5°C / min), cooled to room temperature to obtain a black solid; use sulfuric acid (2mol / L, 80mL) to acidify the gained black solid at 80°C for 24h to remove the active metal Ni and its oxides in the material; The acid-washed material was centrifuged to collect the solid, washed with water (until the pH value of the washing liquid reached 7) and dried (4h) in a vacuum drying oven (80°C); the dried product was subjected to secondary high-temperature pyrolysis , under an argon atmosphere at 1000°C, pyrolyze for 2h (heating rate is 5°C / min), and cool to room temperature to obtain NiN 4 -C single atom catalyst.

[0036] The NiN of embodiment 1 preparation-C single-atom catalyst, scanning electron microscope result (SEM) such ...

Embodiment 2

[0038] Mix 570mg of EMIM-dca with 100mg of nickel nitrate and stir magnetically at room temperature (20°C) for 24h to form a homogeneous blue mixture; place the mixture in a tube furnace and pyrolyze it for 4h at 700°C under an argon atmosphere (heating rate is 5°C / min), cooled to room temperature to obtain a black solid; hydrochloric acid (6mol / L, 80mL) was used to acidify the gained black solid at 100°C for 12h to remove the active metal Ni and its oxides in the material; The acid-washed material was centrifuged, washed (until the pH value of the washing liquid reached 7) and dried (2h) in a vacuum oven (100°C); the dried product was subjected to secondary pyrolysis at 700 Under an argon atmosphere at ℃, pyrolyze for 4h (heating rate is 5℃ / min), and cool to room temperature to obtain NiN 4 -C single atom catalyst.

Embodiment 3

[0040] Mix 570mg EMIM-dca with 100mg nickel acetate, and stir magnetically at room temperature (25°C) for 12h to form a homogeneous blue mixture; place the mixture in a tube furnace and pyrolyze it for 3h at 900°C under an argon atmosphere (heating rate is 5°C / min), cooled to room temperature to obtain a black solid; use sulfuric acid (4mol / L, 80mL) to acidify the gained black solid at 90°C for 20h to remove the active metal Ni and its oxides in the material; The acid-washed material was centrifuged, washed (until the pH value of the washing liquid reached 7) and dried (3h) in a vacuum oven (90° C.); the dried product was subjected to secondary pyrolysis at 900 Under an argon atmosphere at ℃, pyrolyze for 3h (heating rate is 5℃ / min), and cool to room temperature to obtain NiN 4 -C single atom catalyst.

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Abstract

The invention discloses a multistage carbon nanostructure anchored Ni-N4 monatomic catalyst as well as a preparation method and application thereof. According to the catalyst, a nitrogen-doped multistage carbon nanostructure is used as a substrate to anchor Ni atoms, and one Ni atom and four N atoms are coordinated in the catalyst to form a Ni-N4 planar structure, so that Ni is uniformly dispersedon the carbon-nitrogen-based surface of the multistage structure in a monatomic state. The catalyst disclosed by the invention is a Ni monatomic catalyst which has very high catalytic activity and stability on oxygen reduction reaction under an alkaline condition. The catalyst has high electrocatalytic activity on oxygen reduction under an alkaline condition, is low in cost and simple in preparation method, can be developed into a non-noble metal catalyst for replacing a Pt-based catalyst, reduces the cost of a fuel cell, has important significance in the field of fuel cell development and application, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of material chemistry and electrocatalyst, in particular to a Ni-N anchored by a multi-level carbon nanostructure 4 Single-atom catalysts (NiN 4 -C) and its preparation method and application. Background technique [0002] Oxygen reduction reaction (ORR) is a very important basic reaction in the field of electrocatalysis. It is not only the preferred cathode reaction for sustainable energy devices such as fuel cells and metal-air batteries and the main reaction of many metal corrosion processes, but also the most important reaction in biological systems. One of the important basic responses. However, ORR is a multi-step complex reaction involving multiple electron transfer, and the reaction kinetics are relatively sluggish, so suitable catalysts are needed for effective ORR. [0003] At present, Pt and Pt-based alloy catalysts are recognized as one of the best catalysts for ORR, but their application is l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/9083H01M4/8882Y02E60/50
Inventor 蔡哲炜胡耀娟蔡称心周家兴吴萍
Owner NANJING NORMAL UNIVERSITY
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