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Preparation and application of boron-doped carbon shell coated CoNi nanoparticle composite material

A nanoparticle and composite material technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of poor catalytic activity and catalyst corrosion.

Active Publication Date: 2020-05-08
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most catalysts are easily corroded in an alkaline environment, resulting in poor catalytic activity

Method used

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  • Preparation and application of boron-doped carbon shell coated CoNi nanoparticle composite material
  • Preparation and application of boron-doped carbon shell coated CoNi nanoparticle composite material
  • Preparation and application of boron-doped carbon shell coated CoNi nanoparticle composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Dissolve 1.5 mmol BDC in a mixed solution of 64 mL DMF, 4 mL ethanol and 4 mL deionized water at room temperature. After ultrasonication for 0.5h and magnetic stirring for 0.3h, 90mg NiCl 2 •6H 2 O and 270 mg CoCl 2 •6H 2 O was added to the above mixed solution, then 2 mL of TEA was quickly injected, the solution was magnetically stirred for 10 min to form a homogeneous suspension, and it was further continuously ultrasonicated for 8 h under sealed conditions, and finally washed alternately with DMF and ethanol for 3 times and collected by centrifugation. Vacuum drying at ℃ to obtain Ni1Co3-BDC;

[0032] (2) 0.6g Ni1Co3-BDC and 0.2g H 3 BO 3 Mixed and annealed directly in an Ar atmosphere, kept at 400 °C for 2 h, then raised to 600 °C for 1 h, to prepare Ni1Co3@BC-0.2;

[0033] (3) Electrochemical performance test of Ni1Co3@BC-0.2: at a current density of 10mA / cm2 , the overpotential of Ni1Co3@BC-0.2 is 314mV, Tafel is 62mV dec -1 .

Embodiment 2

[0035] (1) Same as embodiment 1;

[0036] (2) 0.6g Ni1Co3-BDC and 0.3g H 3 BO 3 Mixed and annealed directly in Ar atmosphere, kept at 400°C for 2 h, and then raised to 600°C for 1 h to prepare Ni1Co3@BC-0.3;

[0037] (3) Electrochemical performance test of Ni1Co3@BC-0.3: at a current density of 10mA / cm 2 , the overpotential of Ni1Co3@BC-0.2 is 335mV, Tafel is 71mV dec -1 .

Embodiment 3

[0039] (1) Same as embodiment 1;

[0040] (2) 0.6g Ni1Co3-BDC and 0.5g H 3 BO 3 Mixed and annealed directly in an Ar atmosphere, kept at 400°C for 2 h, and then raised to 600°C for 1 h to prepare the electrocatalyst Ni1Co3@BC-0.5;

[0041] (3) Electrochemical performance test of Ni1Co3@BC-0.5: at a current density of 10mA / cm 2 , the overpotential of Ni1Co3@BC-0.2 is 380mV, Tafel is 91mV dec -1 .

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PUM

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Abstract

The invention discloses a preparation method of a boron-doped carbon shell coated CoNi nanoparticle composite material. The preparation method comprises the steps: 1,4-terephthalic acid is fully dissolved in a mixed solution of ethyl alcohol, deionized water and DMF, NiCl2.6H2O and CoCl2.6H2O are added, ethanolamine is added, magnetic stirring is conducted, ultrasonic dispersion, washing and vacuum drying are conducted under the sealing condition, and the nickel-cobalt bimetallic material is obtained and marked as Ni1Co3-BDC; Ni1Co3-BDC and H3BO3 are mixed and directly annealed in an Ar atmosphere, the temperature is kept at 300-400 DEG C for 1-2 h, then the temperature is increased to 600-800 DEG C, the temperature is kept for 1-2 h, and the boron-doped carbon shell coated CoNi nanoparticle composite material is obtained and marked as Ni1Co3@BC. The Ni1Co3@BC is used as an electrocatalyst for water electrolysis oxygen evolution reaction, and due to the fact that the Ni1Co3@BC has a porous nanosheet structure and a boron-doped carbon layer structure and under the synergistic effect of metal Ni and Co, the catalyst shows excellent electrocatalytic performance and good stability in the OER process.

Description

technical field [0001] The invention belongs to the technical field of synthesis and application of catalysts, and in particular relates to the preparation of a boron-doped carbon shell-wrapped CoNi nanometer particle composite material, which is mainly used as an electrocatalyst in the oxygen evolution reaction of electrolyzed water. Background technique [0002] The development of electrochemical devices, such as water electrolyzers and metal-air batteries, is the most promising technology for replacing traditional fossil fuels with renewable energy in the future. Oxygen evolution reaction (OER) is an important half-reaction for the efficiency of electrochemical processes in electrochemical devices due to the inherent reaction sluggishness and formation of rigid O–O double bonds during proton-coupled electron transfer. The development of catalyst materials for OER can effectively solve the bottleneck problem in the practical application of these technologies. Currently, u...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J35/10C25B11/06C25B1/04
CPCB01J27/22C25B11/04C25B1/04B01J35/33B01J35/60Y02E60/36
Inventor 莫尊理刘桂桂帅超何思敏李翠翠郭旭东岳瑞梅梁浩郭瑞斌刘妮娟
Owner NORTHWEST NORMAL UNIVERSITY
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