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Preparation method of self-supporting ferronickel layered double hydroxide sulfide electrocatalyst

A hydroxide and sulfide electrotechnology, applied in the field of electrocatalytic materials, can solve the problems of OER catalyst resource scarcity, complex synthesis methods, and low current density, and achieve easy procurement and preparation, easy operation of the preparation process, and high conductivity Effect

Pending Publication Date: 2020-12-04
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing problems such as scarcity of resources, high price, low current density, high overpotential, poor stability, and complicated synthesis methods for existing OER catalysts

Method used

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  • Preparation method of self-supporting ferronickel layered double hydroxide sulfide electrocatalyst
  • Preparation method of self-supporting ferronickel layered double hydroxide sulfide electrocatalyst
  • Preparation method of self-supporting ferronickel layered double hydroxide sulfide electrocatalyst

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preparation example Construction

[0035] The invention provides a method for preparing a self-supporting nickel-iron layered double hydroxide sulfide electrocatalyst, the preparation method comprising the following steps:

[0036] Step 1, pretreating the original nickel foam to obtain purified nickel foam.

[0037] Specifically, the original nickel foam is cut into 2cm*3cm, with a thickness of 0.5mm. The above-mentioned original nickel foam is immersed in acetone and 3mol / L hydrochloric acid solution in turn and subjected to ultrasonic treatment respectively, and the ultrasonic time is about 15 minutes; then rinsed with deionized water and ethanol for 3-5 times (proper ultrasonication in the middle) to remove the surface Impurities: Dry in a vacuum drying oven at a drying temperature of 60°C and a drying time of 8 to 12 hours to obtain purified nickel foam after drying.

[0038] Because nickel foam has the advantages of high conductivity, large specific surface area, and porous structure, directly growing cat...

Embodiment 1

[0057] In embodiment 1, the pretreatment of foamed nickel and the process of a hydrothermal reaction are the same as those of comparative example 1, and will not be repeated here. The difference is that the secondary hydrothermal reaction, the specific process is as follows: 3mmol thioacetamide is dissolved in 30ml of deionized water, magnetically stirred for 1 hour to obtain a uniform clear solution, then poured into the lining of a stainless steel autoclave containing NiFe LDH / NF (2cm*3cm) obtained by a hydrothermal reaction, and closed the autoclave , put them into an oven at 120 °C and heat them for 1 h to carry out the secondary hydrothermal reaction. The temperature of a hydrothermal reaction can be selected but not limited to 100°C, 110°C, 120°C, 130°C and 140°C, and the heating time can be selected but not limited to 7h, 8h and 9h. After cooling to room temperature after the reaction, take out the nickel foam and rinse it with deionized water and absolute ethanol for 3...

Embodiment 2

[0060] In embodiment 2, the process of the pretreatment of foam nickel, primary hydrothermal reaction and secondary hydrothermal reaction is identical with embodiment 1, does not go into details here, and its difference is the condition of secondary hydrothermal reaction, in this embodiment Among them, the conditions of the secondary hydrothermal reaction are heating temperature 120 ℃, reaction time 4h, finally get NiFe LDH-S4 / NF.

[0061] Oxygen evolution reaction (OER) catalytic performance test is the same as the test method in Comparative Example 1, the results show that when the current density is 50mA / cm 2 , the overpotential is 315mV.

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Abstract

The invention provides a preparation method of a self-supporting ferronickel layered double hydroxide sulfide electrocatalyst. The preparation method comprises the steps of pretreating original foamednickel to obtain purified foamed nickel; dissolving nickel nitrate hexahydrate, iron nitrate nonahydrate and urea into deionized water according to a preset proportion to obtain a mixed solution, wherein the concentration of cations in the mixed solution is 40-45 mmol / L, and the concentration of urea in the mixed solution is 130-150 mmol / L; carrying out primary hydrothermal reaction on the mixedsolution to obtain NiFe LDH / NF; putting the NiFe LDH / NF into a thioacetamide solution, and carrying out a secondary hydrothermal reaction to obtain NiFe LDH-Sx / NF, wherein x is any number from 1 to 8.According to the preparation method of the self-supporting ferronickel layered double hydroxide sulfide electrocatalyst provided by the invention, the electrocatalyst shows excellent oxygen evolutionreaction catalytic activity under an alkaline condition, a ferronickel double hydroxide nanosheet structure directly growing on foamed nickel is beneficial to electron transfer, the catalytic surfacearea is increased, and the catalytic active sites are improved, so that diffusion of oxygen evolution reaction is facilitated.

Description

technical field [0001] The invention relates to the technical field of electrocatalytic materials, in particular to a preparation method of a self-supporting nickel-iron layered double hydroxide sulfide electrocatalyst. Background technique [0002] Hydrogen energy has good energy conversion efficiency, high energy density, zero carbon dioxide emissions, and environmental compatibility, and is considered to be an ideal choice to replace traditional fossil fuels. Electrolyzed water technology is based on the principle of electrochemical water splitting, using sustainable solar energy and wind energy to convert it into electrical energy, and then driving and decomposing water into hydrogen and oxygen. It is considered to be an efficient and sustainable way to produce hydrogen. [0003] Layered double hydroxides (Layer double hydroxides, LDHs) have attracted much attention due to their large specific surface area, diverse chemical properties, and open structure. For the oxygen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043B01J37/10B82Y30/00B82Y40/00C25B1/04C25B11/06C25B11/03
CPCB01J27/043B01J37/10B82Y30/00B82Y40/00C25B1/04B01J35/50B01J35/40B01J35/33Y02E60/36
Inventor 孙剑辉孙蓓蕾禹崇菲陈如艳张雅楠吴宇涵李冰宇刘瑜辉董淑英
Owner HENAN NORMAL UNIV
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