Preparation method of Bi@NiFe-LDH/NF composite material

A composite material, 2·6H2O technology, applied in the field of electrocatalysis, can solve the problems of small Tafel slope, low potential and high cost, and achieve the effects of uniform product, high yield and fast heating speed

Active Publication Date: 2021-04-23
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the catalysts for oxygen evolution reaction in electrolytic water are mostly noble metal oxides, such as iridium oxide (IrO 2 ) and ruthenium oxide (RuO 2 ), etc., they have the advantages of low overpotential and small Tafel slope, although they have good catalytic activity, but there is a problem of high cost, which limits the development of commercialization

Method used

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  • Preparation method of Bi@NiFe-LDH/NF composite material
  • Preparation method of Bi@NiFe-LDH/NF composite material
  • Preparation method of Bi@NiFe-LDH/NF composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Put nickel foam (10mm×13mm×0.3mm) into 37wt% hydrochloric acid solution and ultrasonicate for 4 minutes to remove the NiO layer on the surface, then ultrasonically in deionized water and absolute ethanol for 8 minutes each to remove the nickel foam. The residue is made into a nickel foam carrier.

[0034] 2. Mix 0.5mmol of Ni(NO 3 ) 2 ·6H 2 O, 0.5mmol of Fe(NO 3 )3 9H 2 O, 0.5mmol of CO(NH 2 ) 2 and 0.45 mmol of NH 4 Add F into 40mL of deionized water and stir well to make salt solution A.

[0035] 3. Transfer the prepared salt solution A above to a microwave synthesizer connected to a reflux device. The microwave temperature is 90°C, the time is 10 minutes, and the power is 700W. After the reaction is completed, take it out and let it cool naturally, and then filter. Take the filter residue.

[0036] 4. Wash the filter residue with absolute ethanol until the filtrate is colorless. Then it was dried in an oven at 60°C for 10 h to obtain NiFe-LDH.

[0037] ...

Embodiment 2

[0043] 1. Put nickel foam (10mm×13mm×0.3mm) into 37wt% hydrochloric acid solution and ultrasonicate for 5 minutes to remove the NiO layer on the surface, then ultrasonically in deionized water and absolute ethanol for 9 minutes each to remove the nickel foam. The residue is made into a nickel foam carrier.

[0044] 2. Mix 0.5mmol of Ni(NO 3 ) 2 ·6H 2 O, 1mmol of Fe(NO 3 ) 3 9H 2 O, 0.5mmol of CO(NH 2 ) 2 and 0.45 mmol of NH 4 Add F into 40mL of deionized water and stir well to make salt solution A.

[0045] 3. Transfer the prepared salt solution A above to a microwave synthesizer connected to a reflux device. The microwave temperature is 105°C, the time is 20 minutes, and the power is 700W. After the reaction is completed, take it out and let it cool naturally, and then filter. Take the filter residue.

[0046] 4. Wash the filter residue with absolute ethanol until the filtrate is colorless. Then it was dried in an oven at 65°C for 9h to obtain NiFe-LDH.

[0047] 5...

Embodiment 3

[0053] 1. Put nickel foam (10mm×13mm×0.3mm) into 37wt% hydrochloric acid solution and ultrasonicate for 6 minutes to remove the NiO layer on the surface, then ultrasonically in deionized water and absolute ethanol for 10 minutes each to remove the nickel foam. The residue is made into a nickel foam carrier.

[0054] 2. Mix 0.5mmol of Ni(NO 3 ) 2 ·6H 2 O, 1.5mmol of Fe(NO 3 ) 3 9H 2 O, 0.5mmol of CO(NH 2 ) 2 and 0.45 mmol of NH 4 Add F into 40mL of deionized water and stir well to make salt solution A.

[0055] 3. Transfer the above-prepared salt solution A to a microwave synthesizer connected to a reflux device. The microwave temperature is 120°C, the time is 30 minutes, and the power is 700W. After the reaction is completed, take it out and let it cool naturally, and then filter. Take the filter residue.

[0056] 4. Wash the filter residue with absolute ethanol until the filtrate is colorless, and then dry it in an oven at 70°C for 8 hours to obtain NiFe-LDH.

[00...

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Abstract

The invention discloses a preparation method of a Bi@NiFe-LDH/NF composite material, which comprises the steps of (1) cleaning foamed nickel to obtain a foamed nickel carrier; (2) preparing Ni(NO3)2.6 H2O, Fe(NO3)3.9H2O, CO(NH2)2 and NH4F into a salt solution A; (3) carrying out microwave reaction on the salt solution A, filtering, and taking filter residues; (4) cleaning and drying the filter residues to obtain NiFe-LDH; (5) dispersing NiFe-LDH, acetylene black and polyvinylidene fluoride into N-methyl pyrrolidone to form pasty liquid, coating the surface of the foamed nickel carrier with the pasty liquid, and drying to obtain a crude product NiFe-LDH/NF; and (6) taking Bi(NO3)3.5H2O, EDTA-2Na and KCl to prepare an electrolyte, taking the crude product NiFe-LDH/NF as a working electrode, and carrying out deposition to obtain Bi@NiFe-LDH/NF. The prepared electrocatalyst has the advantages of large specific surface area, full contact with a reaction substrate and the like, and is beneficial to rapid proton transportation and timely escape of gas in the reaction process.

Description

technical field [0001] The invention relates to a preparation method of a Bi@NiFe-LDH / NF composite material, which belongs to the field of electrocatalysis. Background technique [0002] Energy crisis and environmental pollution are two major problems facing human beings. It is an urgent need for people to replace traditional petrochemical energy with other alternative energy sources. As a clean new energy, hydrogen energy has a higher combustion heat release compared with traditional fossil fuels. At the same time, the product of combustion is water, which can effectively alleviate the problems of greenhouse effect and air pollution, and has broad application prospects. [0003] At present, hydrogen production is mainly from fossil fuels, but the hydrogen produced from fossil fuels has low purity and high cost. Hydrogen production by electrolysis of water is another way to produce hydrogen. When electrolyzing water, the cathodic reaction is mainly the hydrogen evolution re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/031C25B11/053C25B11/061C25B11/091C25D3/54
CPCC25B1/04C25D3/54Y02E60/36
Inventor 师红旗汤葱葱林逸鑫丁毅沈晓冬
Owner NANJING UNIV OF TECH
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