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A three-dimensional multi-level structure highly dispersed nickel-based electrocatalytic material and its preparation method

An electrocatalytic material and highly dispersed technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor conductivity, few active sites, and easy aggregation of active components, etc., to achieve Effects of preventing particle agglomeration, reducing overpotential, and excellent catalytic activity

Active Publication Date: 2020-10-02
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of poor electrical conductivity, easy agglomeration of active components, and few active sites in the preparation of nickel-based electrocatalytic materials in the existing methods, and provide a three-dimensional multi-level structure highly dispersed nickel-based electrocatalytic material and its preparation method to enhance the electrocatalytic activity of the material

Method used

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  • A three-dimensional multi-level structure highly dispersed nickel-based electrocatalytic material and its preparation method
  • A three-dimensional multi-level structure highly dispersed nickel-based electrocatalytic material and its preparation method
  • A three-dimensional multi-level structure highly dispersed nickel-based electrocatalytic material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Pretreatment of foamed nickel: Cut commercially available nickel foam into 1cm×2cm size, immerse in 20mL of acetone, ultrasonically treat for 15min, remove surface oil, wash 3 times with water, 5min each time, wash off acetone; use 2mol / L Soak in HCl for 5 minutes to remove the oxide film on the surface of nickel foam, and then wash it with water for 3 times, each time for 2 minutes, to remove the Cl - , dried under vacuum conditions for later use.

[0032] A. Use 80mL deionized water to prepare an aluminum nitrate solution with a concentration of 0.03mol / L, transfer it to a 100mL polytetrafluoroethylene liner, immerse the pretreated foam nickel sheet vertically into the above solution, and ultrasonically treat it for 30min; then Add 0.05mol urea and 0.02mol ammonium fluoride in sequence, ultrasonically treat for 2 minutes, seal the polytetrafluoroethylene liner and put it into the autoclave, react at 180°C for 12 hours, after cooling to room temperature, wash with deio...

Embodiment 2

[0036] Commercially available nickel foam is pretreated according to Example 1.

[0037] A. Use 80mL deionized water to prepare an aluminum nitrate solution with a concentration of 0.03mol / L, transfer it to a 100mL polytetrafluoroethylene liner, and handle well Immerse the foamed nickel sheet vertically into the above solution, ultrasonic treatment for 30min; then add 0.08mol urea, 0.02mol ammonium fluoride in turn, ultrasonic treatment for 2min, seal the polytetrafluoroethylene liner and put it into the autoclave, and react at 150℃ for 12h , after cooling to room temperature, washed with deionized water and ethanol three times, and dried to obtain in-situ grown nickel-based hydrotalcite NiAl-LDH / NF.

[0038] B. Place the obtained NiAl-LDH / NF in a three-necked flask of 150mL deionized water; prepare H with a concentration of 0.5mol / L 3 BO 3 solution, and added dropwise into a three-necked flask until the pH of the solution reached 4.5, and then reacted at 90° C. for 12 hour...

Embodiment 3

[0041] Commercially available nickel foam is pretreated according to Example 1.

[0042] A. Use 80mL deionized water to prepare an aluminum nitrate solution with a concentration of 0.03mol / L, transfer it to a 100mL polytetrafluoroethylene liner, immerse the pretreated foam nickel sheet vertically into the above solution, and ultrasonically treat it for 30min; then Add 0.08mol urea and 0.025mol ammonium fluoride in sequence, ultrasonically treat for 2min, seal the polytetrafluoroethylene liner and put it into the autoclave, react at 120°C for 12h, after cooling to room temperature, wash with deionized water and ethanol respectively 3 times, drying to obtain in-situ growth of nickel-based hydrotalcite NiAl-LDH / NF.

[0043] B. Place the obtained NiAl-LDH / NF in a three-necked flask of 150mL deionized water; prepare NaH with a concentration of 0.8mol / L 2 PO 4 solution, and added dropwise into a three-necked flask until the pH of the solution reached 3.5, and then reacted at 90° C...

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Abstract

The invention provides a high-dispersion nickel-based electrocatalytic material with a three-dimensional multi-level structure and a preparation method thereof. In the method, nickel foam is used as a conductive matrix and a nickel source required for the reaction is provided, urea is used as a precipitating agent, and ammonium fluoride is used as a precipitant. Etchant, in-situ growth of NiAl-LDH / NF precursor on the surface of nickel foam framework structure, through the ion exchange method, the anion H 2 PO 4 ‑ , B(OH) 4 ‑ Introduced into the interlayer of hydrotalcite, the hydrotalcite intermediate containing the anion, after high-temperature reduction, a highly dispersed nickel-based material with a three-dimensional multi-level structure is obtained; its chemical formula is NiY‑Al 2 o 3 / NF, where Y is one of P or B. The material is used for the electrocatalytic oxygen evolution reaction under alkaline conditions, when the current density reaches 10mA cm ‑2 , the oxygen evolution reaction overpotential is 270-190mV. When the material is used in the selective electrocatalytic oxidation reaction of 5-hydroxymethylfurfural under alkaline conditions, the conversion rate and selectivity reach 92-100% and 95-100% respectively, which proves that the material is suitable as an electrocatalytic material.

Description

technical field [0001] The invention belongs to the field of catalysis of inorganic nanomaterials, relates to electrocatalyst preparation technology, in particular to a highly dispersed nickel-based electrocatalytic material with a three-dimensional multi-level structure and a preparation method thereof. The catalyst is used for electrocatalytic oxygen evolution reaction and production of water Electrocatalytic oxidation reaction of substance molecules. [0002] technical background [0003] With the increase of global energy demand and the excessive consumption of fossil resources, the energy crisis and environmental pollution problems are becoming more and more serious. In order to realize the sustainable development of ecology and economy, it is particularly important to seek and develop new sustainable energy sources. At present, solar energy, wind energy, hydrogen energy, and biomass energy are all promising renewable energy sources. Among them, hydrogen, as the best c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J27/185B01J35/02B01J37/08B01J37/18B01J37/30C25B1/04C25B3/02C25B11/06C25B3/23
CPCC25B1/04C25B11/04B01J23/755B01J27/1853B01J35/0033B01J35/006B01J35/0073B01J35/02B01J37/08B01J37/18B01J37/30C25B3/23Y02E60/36
Inventor 范国利李梦媛李峰
Owner BEIJING UNIV OF CHEM TECH
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