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Layered duplex metal hydroxide composite structure electrocatalyst and preparation method

A layered hydroxide and layered bimetal technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., to achieve the effects of environmental friendliness, optimized adsorption energy, and convenient operation

Active Publication Date: 2019-01-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no reports on the preparation of CoFe-LDH / NiFe-LDH / NF composite structure electrode materials and their application in electrocatalytic water splitting

Method used

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  • Layered duplex metal hydroxide composite structure electrocatalyst and preparation method
  • Layered duplex metal hydroxide composite structure electrocatalyst and preparation method
  • Layered duplex metal hydroxide composite structure electrocatalyst and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the preparation of CoFe-LDH / NF nano sheet:

[0027] Weigh 2mmol of Fe(NO 3 ) 3 9H 2 O, 2mmol Co(NO 3 ) 2 ·6H 2 0, 4mmol ammonium fluoride and 10mmol urea in a beaker, add deionized water therein, and magnetically stir for 20min to completely dissolve, then add the transparent orange-yellow solution of the gained in the reaction kettle of polytetrafluoroethylene, and dry the foamed nickel Immerse, carry out hydrothermal reaction, and react at 120°C for 6 hours; after cooling to room temperature naturally, take out the nickel foam, wash with water and alcohol for 3 times, and dry to obtain CoFe-LDH / NF.

Embodiment 2

[0028] Embodiment 2: Preparation of CoFe-LDH / NiFe-LDH-200S / NF sample:

[0029] Take 6mmol Ni(NO 3 ) 2 ·6H 2 O and 6 mmol FeSO 4 ·7H 2O was placed in a beaker, and 50 mL of deionized water was added thereto, and magnetically stirred until it was completely dissolved to obtain a homogeneous solution A, which was set aside. The electrodeposition process was realized in a three-electrode system, first using dry CoFe-LDH / NF as the working electrode, and platinum wire and Ag / AgCl electrodes as the counter and reference electrodes, respectively. Under the condition of room temperature, the potential is -1.2~-0.8V, and the solution A is used as the electrolyte, and the constant potential is deposited for 200s. After the deposition is completed, the nickel foam is taken out with tweezers, rinsed with deionized water and absolute ethanol, and dried to obtain the CoFe-LDH / NiFe-LDH / NF composite material. The material is named CoFe-LDH / NiFe-LDH / NF-3.

Embodiment 3

[0030] Embodiment 3: Preparation of CoFe-LDH / NiFe-LDH-50S / NF sample:

[0031] The preparation method of the electrocatalytic material is basically the same as in Example 2, except that the constant potential deposition time is 50s. The material is named CoFe-LDH / NiFe-LDH / NF-1.

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Abstract

The invention relates to a layered duplex metal hydroxide composite structure electrocatalyst and a preparation method, belonging to the technical field of electrocatalysts. Ferrocobalt layered hydroxide, which takes foamed nickel as a base, serves as a working electrode, and a platinum wire and a silver / silver chloride electrode serve as a counter electrode and a reference electrode respectively.Weigh Ni(NO3)2.6H2O and FeSO4.7H2O in a beaker, add deionized water therein the beaker to form a solution A, and carry out magnetic stirring until complete dissolution; in an indoor temperature condition, the potential is from minus 1.2V to minus 0.8 V, and the solution A serves as electrolyte to perform constant potential deposition; take out the foamed nickel after the deposition, then wash cleanly by using the deionized water and absolute ethyl alcohol, and dry to obtain the layered duplex metal hydroxide composite structure electrocatalyst.

Description

technical field [0001] The invention relates to a layered double metal hydroxide composite structure electrocatalyst and a preparation method, belonging to the technical field of electrocatalysts. Background technique [0002] In recent years, human development is facing a severe energy crisis and environmental pollution problems. The production of hydrogen and oxygen through electrolysis of water can effectively alleviate the current crisis. Total water splitting is a current research hotspot, including hydrogen evolution reaction and oxygen evolution reaction. However, due to the slow kinetics of oxygen evolution reaction and high reaction kinetic energy barrier, which seriously restricts the efficiency of electrolysis of water, it is necessary to seek a Efficient oxygen evolution electrocatalysts become the key to improving the efficiency of total water splitting performance. The most active electrocatalyst is IrO 2 and RuO 2 , but due to the scarcity and high price of...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06C25B11/03
CPCC25B1/04C25B11/031C25B11/091Y02E60/36
Inventor 李娣杨荣姜德立施伟东陈敏
Owner JIANGSU UNIV
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