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Preparation method of nitrogen-doped graphite carbon layer coated Fe-Ni alloy nano square electrocatalyst

A technology of alloy nano and electrocatalyst, which is applied in the field of electrocatalysis, can solve the problems such as the difficulty in realizing the controllable crystal surface of non-noble metal-based electrocatalysts

Inactive Publication Date: 2020-05-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because it is difficult to realize the controllable preparation of non-noble metal-based electrocatalyst crystal facets, there are few reports on the catalytic activity of non-noble metal-based electrocatalysts with different crystal facets.

Method used

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  • Preparation method of nitrogen-doped graphite carbon layer coated Fe-Ni alloy nano square electrocatalyst
  • Preparation method of nitrogen-doped graphite carbon layer coated Fe-Ni alloy nano square electrocatalyst
  • Preparation method of nitrogen-doped graphite carbon layer coated Fe-Ni alloy nano square electrocatalyst

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Experimental program
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Embodiment 1

[0038] In the present embodiment, the Na of 1.94g 4 Fe(CN) 6 10H 2 O and 1.05g NiSO 4 ·6H 2 O was dissolved in 40ml of deionized water respectively to obtain Na with a molar concentration of 0.1M 4 Fe(CN) 6 aqueous solution and NiSO 4 aqueous solution. 40ml of 0.1M NiSO 4 The aqueous solution was added dropwise with 0.1M Na 4 Fe(CN) 6 Aqueous solution produces a green precipitate. After being collected by centrifugation, it was dried in a vacuum oven at 60°C to obtain Na 2 FeNi(CN) 6 The powder has a particle size of 30-60 nanometers. to Na 2 FeNi(CN) 6 After the powder was fully ground, it was transferred to a quartz calciner, and calcined in a tube furnace at 900°C for 2 hours under an argon atmosphere to obtain a black powder sample.

[0039] X-ray diffraction (XRD) analysis shows that FeNi alloy is generated, and graphite carbon diffraction peak appears simultaneously ( figure 1 ). The morphology of FeNi alloy was observed by scanning electron microscope (...

Embodiment 2

[0041] In the present embodiment, the Na of 1.94g 4 Fe(CN) 6 10H 2 O and 0.95 g NiCl 2 ·6H 2 O was dissolved in 40ml of deionized water respectively to obtain Na with a molar concentration of 0.1M 4 Fe(CN) 6 aqueous solution and NiCl 2 aqueous solution. 40ml of NiCl with a molar concentration of 0.1M 2 The solution was added dropwise with 0.1M Na 4 Fe(CN) 6 Aqueous solution produces a green precipitate. After being collected by centrifugation, it was dried in a vacuum oven at 60°C to obtain Na 2 FeNi(CN) 6 The powder has a particle size of 40-70 nanometers. to Na 2 FeNi(CN) 6 After the powder was fully ground, it was transferred to a quartz calciner, and was calcined in a tube furnace at 1000 °C for 2 hours under an argon atmosphere to obtain a black powder sample. It was observed by a transmission electron microscope (TEM) that the surface of the FeNi alloy nanocubes was coated. with graphitic carbon layer ( Figure 6 ), the surface graphitic carbon layer is d...

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Abstract

The invention belongs to the field of electrocatalysis, and particularly relates to a preparation method of a nitrogen-doped graphite carbon layer coated Fe-Ni alloy nano square block electrocatalyst.The preparation method comprises the following steps: by taking sodium ferricyanide and a divalent metal nickel salt as precursors, preparing a prussian blue derivative {Na2FeNi (CN) 6} through a chemical method, and performing high-temperature heat treatment under a protective atmosphere to obtain the nitrogen-doped graphite carbon layer coated Fe-Ni alloy nano square electrocatalyst. Differentcrystal faces of the electrocatalyst have different atoms and electronic structures, and different electrocatalytic activities can be shown. The Fe-Ni alloy with the exposed specific crystal face canbe prepared through a simple chemical method and a subsequent heat treatment process, and an effective carrier is provided for study on the relation between the surface structure and the activity of anon-noble metal-based catalyst. Nitrogen-doped graphite carbon layer surface coating can improve the conductivity, catalytic activity and stability of the catalyst effectively.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, in particular to a method for preparing a nitrogen-doped graphite carbon layer-coated Fe-Ni alloy nano-square electrocatalyst. Background technique [0002] Electrocatalytic water splitting to produce hydrogen is an important way to reduce environmental pollution and realize renewable clean energy, and the oxygen evolution reaction is the rate-controlling step in the water splitting reaction process. It is of great scientific value and practical significance to develop efficient, stable and cheap oxygen evolution catalysts. Fe, Ni transition metals and their compounds are widely studied and promising non-precious metal-based oxygen evolution catalyst materials, and Fe-Ni alloy is a typical representative of them. The surface atomic / electronic structure of the catalyst directly affects the adsorption form and adsorption capacity of water molecules on its surface. Therefore, the surface atomic / ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02B01J35/00
CPCB01J27/24B01J35/396B01J35/33B01J35/40
Inventor 刘岗甄超成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI