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Preparation method of high-defect boron nitride supported atomic-scale dispersed metal catalyst

A technology of metal catalysts and boron nitride, which is applied in the field of synthesis of atomically dispersed metal catalysts, can solve the problems of not being simple enough, unable to realize wide application, high equipment requirements, etc., and achieve cheap raw materials, excellent ORR catalytic performance, and easy raw materials The effect

Active Publication Date: 2022-06-24
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, methods such as chemical exfoliation, mechanical exfoliation of hexagonal boron nitride blocks, and chemical vapor deposition are usually used to prepare single-layer or few-layer boron nitride nanosheets, which are not simple enough, and high equipment requirements make it impossible to achieve wide application.

Method used

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  • Preparation method of high-defect boron nitride supported atomic-scale dispersed metal catalyst
  • Preparation method of high-defect boron nitride supported atomic-scale dispersed metal catalyst
  • Preparation method of high-defect boron nitride supported atomic-scale dispersed metal catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Example 1: Preparation of Co@e-BN@CNT

[0045] Urea, boric acid and carbon nanotubes (molar ratio of 5: 1: 10) were mixed and ground, and treated at a constant temperature of 1050 °C in a mixed atmosphere of ammonia and argon for 2 hours. The obtained powder was heated and stirred in a 0.5 mol / L boric acid solution at 90 °C for 30 minutes to obtain an etched boron nitride composite material. The etched boron nitride composite material was washed with deionized water and dried in a vacuum oven at 60° C. to obtain a defect-rich boron nitride composite material. The dried defect-rich boron nitride composites were immersed in an aqueous solution of cobalt nitrate and ultrasonicated for 5 hours. After vacuum freeze-drying, they were heated to 750°C at a heating rate of 10°C / min under a mixed atmosphere of ammonia and argon, and treated at a constant temperature for 2 hours. Then, naturally cooled to room temperature, and after pyrolysis annealing, a uniformly distributed at...

Embodiment 2

[0047] Example 2: Electrocatalytic OER performance test of Co@e-BN@CNT

[0048] The electrocatalytic OER performance test of the Co@e-BN@CNT obtained in Example 1 was carried out on an electrochemical workstation (CHI 760E, Shanghai Chenhua) using a traditional three-electrode system. Among them, the electrolyte was 1.0 M KOH aqueous solution, and the platinum sheet electrode and the Hg / HgO electrode were used as the counter electrode and the reference electrode, respectively. 3 mg of Co@e-BN@CNT was dispersed in 72 μL of deionized water, 48 μL of isopropanol and 10 μL of Nafion mixed solution. After sonication for 1 hour, the sample was dropped onto a glassy carbon electrode as a working electrode. Depend on Figure 4 It can be seen that Co@e-BN@CNT drives 10 mA cm -2 The current density overpotential is only 287 mV. Figure 5 The Tafel plot shown is based on Figure 4 It can be seen from the calculation that the Tafel slope of Co@e-BN@CNT on the platinum carbon electrode...

Embodiment 3

[0049] Example 3: Electrocatalytic ORR performance test of Co@e-BN@CNT

[0050] The electrocatalytic OER performance test of the Co@e-BN@CNT obtained in Example 1 was carried out on an electrochemical workstation (CHI 760E, Shanghai Chenhua) using a traditional three-electrode system. Among them, the electrolyte is an oxygen-saturated 1.0 M KOH aqueous solution, and the platinum sheet electrode and the Hg / HgO electrode are used as the counter electrode and the reference electrode, respectively. 3 mg of Co@e-BN@CNT was dispersed in 72 μL of deionized water, 48 μL of isopropanol and 10 μL of Nafion mixed solution. After sonication for 1 hour, the samples were dropped onto glassy carbon electrodes and cobalt foams as working electrodes. Depend on Figure 7 It can be seen that the initial potential of Co@e-BN@CNT is 0.864 V and the half-wave potential is 0.822 V when the rotation speed is 1600 rpm.

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Abstract

The invention discloses a preparation method of a high-defect boron nitride supported atomic-scale dispersed metal catalyst and application of the high-defect boron nitride supported atomic-scale dispersed metal catalyst in the field of energy catalysis. The preparation method comprises the following steps: coating the periphery of a carbon nano tube with a boron nitride layer through a one-pot method for the first time, etching the surface of boron nitride by using a boric acid solution to produce a large number of defects, dipping in a metal salt solution, and pyrolyzing in an ammonia-argon mixed atmosphere to obtain the defect-rich boron nitride supported atomic-scale dispersed metal catalyst X (at) e-BN (at) CNT (X = Co, Ni, Fe and the like). The thickness of the prepared boron nitride coating layer is only 1.70 nm, the boron nitride coating layer is about five layers and has a large number of defects, and supported metal is evenly dispersed in an atomic scale. The preparation method of the atomic-scale dispersed metal catalyst is simple, the cost is low, and the atomic-scale dispersed metal catalyst has potential commercial application value in the field of energy catalysis and can be used for catalytic reactions such as electro-catalytic water decomposition, oxygen reduction reaction (ORR), carbon dioxide reduction reaction (CO2RR), organic catalytic reaction and zinc-air batteries and energy devices.

Description

technical field [0001] The invention relates to the preparation of nanomaterials and the field of energy catalysis, in particular to the synthesis of an atomically dispersed metal catalyst supported by high-defect boron nitride and its application in the field of energy catalysis. Background technique [0002] In recent years, metal atomically dispersed catalysts have become a research hotspot in the field of energy catalysis due to their ultra-high atomic utilization, unique physical and chemical properties, and excellent catalytic performance, and are widely used in the field of catalysis, such as thermocatalysis, Electrocatalysis, photocatalysis and other fields. In addition to constraining the atomic dispersion of metals, the support of metal atomically dispersed catalysts can also produce certain synergistic effects and affect the performance of catalysts. At present, the commonly used atomically dispersed metal catalyst supports are carbon materials, such as carbon na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J27/24B01J35/00H01M4/90
CPCB01J27/24B01J23/75H01M4/9041B01J35/391B01J35/33
Inventor 何纯挺刘敏玲章佳
Owner JIANGXI NORMAL UNIV
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