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CeO2-NiCo2O4/NF composite electrocatalytic material and preparation method and application thereof

A technology of ceo2-nico2o4 and electrocatalytic materials, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor stability and low activity

Inactive Publication Date: 2019-05-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a CeO 2 -NiCo 2 o 4 / NF composite electrocatalytic material and its preparation method and application

Method used

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  • CeO2-NiCo2O4/NF composite electrocatalytic material and preparation method and application thereof
  • CeO2-NiCo2O4/NF composite electrocatalytic material and preparation method and application thereof
  • CeO2-NiCo2O4/NF composite electrocatalytic material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Pretreatment of foamed nickel: Cut commercially available nickel foam into 1cm×2cm size, soak in 20mL of acetone, ultrasonically treat for 10min, remove surface oil, wash 3 times with water, wash off acetone; soak in 3mol / L HCl for 5min , remove the nickel oxide layer on the surface of the nickel foam, and then wash it with water for 3 times, each time for 5 minutes, to wash off the Cl - , dried under vacuum conditions for later use.

[0037] Prepare 80mL mixed metal salt solution of cobalt nitrate and nickel nitrate, the total metal ion concentration is 0.085mol / L, vertically immerse the treated foam nickel into the mixed metal salt solution for 5min; add 0.8mmol hexadecyl trimethyl Ammonium bromide, ultrasonic treatment for 5 minutes, then add 6 mmol urea as a precipitant, ultrasonic treatment for 5 minutes; react at 180 ° C for 4 hours in a reactor lined with polytetrafluoroethylene liner, rinse with deionized water for 5 times, at 70 °C to obtain a one-dimensional ...

Embodiment 2

[0040] Commercially available nickel foam was pretreated according to Example 1.

[0041] Prepare 80mL mixed metal salt solution of cobalt nitrate and nickel nitrate, the total metal ion concentration is 0.085mol / L, vertically immerse the treated foam nickel into the mixed metal salt solution for 5min; then add 0.5mol hexadecyl trimethyl ammonium bromide, ultrasonically treated for 5 minutes, then 12 mmol of urea was added as a precipitant, and ultrasonically treated for 5 minutes; reacted at 160°C for 4 hours in a reactor lined with a polytetrafluoroethylene liner, rinsed with deionized water for 5 times, and then Dry at 70°C to obtain a one-dimensional nickel-cobalt composite hydroxide NiCo grown on the foamed nickel skeleton. 2 -OH / NF. Will get NiCo 2 -OH / NF was placed in a muffle furnace, baked under air atmosphere, raised to 500°C at a heating rate of 5°C / min, and kept at this temperature for 4 hours, and cooled naturally to room temperature to obtain a foam growing on ...

Embodiment 3

[0044] Commercially available nickel foam was pretreated according to Example 1.

[0045] Use cobalt nitrate and nickel nitrate to prepare 80 mL of mixed metal salt solution with a total metal ion concentration of 0.085 mol / L, and vertically immerse the treated foam nickel into the above solution for 5 minutes to sonicate; then add 0.6 mol cetyl trimethyl bromide Ammonium, ultrasonic treatment for 5 minutes, then add 18mmol urea as a precipitant, ultrasonic treatment for 5 minutes; react at 160°C for 4h in a reactor lined with polytetrafluoroethylene liner, rinse with deionized water for 5 times, at 70°C Dry to obtain a one-dimensional nickel-cobalt composite hydroxide NiCo that grows on the foamed nickel skeleton. 2 -OH / NF. Will get NiCo 2 -OH / NF was placed in a muffle furnace, baked under air atmosphere, raised to 500°C at a heating rate of 5°C / min, and kept at this temperature for 4 hours, and cooled naturally to room temperature to obtain a foam growing on the nickel foa...

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Abstract

The invention provides a CeO2-NiCo2O4 / NFcomposite electrocatalytic material and a preparation method and application thereof. The method includes the steps that a nickel-cobalt hydroxide precursor (NiCo2-OH / NF) is grown in situ on the surface of foamed nickel through a hydrothermal method, a one-dimensional NiCo2O4 nanowire is constructed on the surface of the foamed nickel through roasting treatment, finally, CeO2 are uniformly deposited on the surface of the NiCo2O4 nanowire through an electro-deposition method to obtain the CeO2-NiCo2O4 / NF composite electrocatalytic material, wherein NiCo2O4 is of a spinel structure, NiCo2O4 is oriented to form the nanowire growing vertically on the surface of a foamed nickel sheet substrate, and the CeO2 are uniformly deposited on the surface of NiCo2O4. The composite electrocatalytic material has excellent electrocatalytic oxygen evolution activity and stability, when the current density is 10 mA.cm<-2>, in the alkaline electrolyte environment, the oxygen evolution overpotential of CeO2-NiCo2O4 / NF is 261-217 mV, and the oxygen evolution overpotential is 401-334 mV in the acidic electrolyte environment; and the catalytic material is used for anelectrocatalytic oxygen evolution reaction of water.

Description

technical field [0001] The invention relates to the technical field of electrocatalyst preparation, in particular to a composite electrocatalytic material and a preparation method thereof. The catalytic material is used for the electrocatalytic oxygen evolution reaction of water and belongs to the field of catalysis of inorganic metal composite nanomaterials. technical background [0002] Energy shortage and environmental crisis are two major problems restricting the development of the world economy and society. How to improve the utilization rate of fossil resources and actively seek new ways of energy utilization is imminent. Currently available renewable energy for development and utilization includes water energy, wind energy, solar energy, hydrogen energy, biomass energy, etc., among which hydrogen energy is due to its high energy density (142MJ Kg -1 ), as well as the characteristics of no pollution to the environment during use and release, have been widely concerned ...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J37/34C25B1/04C25B11/06C25B11/03
CPCY02E60/36
Inventor 范国利许晶晶郑晓东李峰
Owner BEIJING UNIV OF CHEM TECH
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