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Preparation method of non-noble metal NiCoFe/NF electrocatalyst and application of electrocatalyst to oxygen evolution

An electrocatalyst and non-precious metal technology, applied in the field of electrocatalysis, can solve the problems of limiting large-scale commercial application, slow kinetics, and scarce reserves

Active Publication Date: 2019-09-27
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxygen evolution reaction (OER) at the anode is a four-electron transfer process with slow kinetics throughout the water electrolysis process, which largely limits the efficiency of hydrogen production.
At the same time, noble metal catalysts (RuO 2 , IrO 2 etc.) Due to the scarcity of reserves and high price, its large-scale commercial application is limited

Method used

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  • Preparation method of non-noble metal NiCoFe/NF electrocatalyst and application of electrocatalyst to oxygen evolution
  • Preparation method of non-noble metal NiCoFe/NF electrocatalyst and application of electrocatalyst to oxygen evolution
  • Preparation method of non-noble metal NiCoFe/NF electrocatalyst and application of electrocatalyst to oxygen evolution

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Dissolve 0.60mmol of nickel acetate, 3.0mmol of cobalt acetate and 10.0mmol of 2-methylimidazole into 40.0ml of anhydrous methanol, sonicate for 20 minutes to fully dissolve, then transfer to a 100ml reaction kettle and put Add the pretreated nickel foam, set the temperature at 130°C, and the reaction time is 15 hours. After the reaction is completed, let it cool naturally and rinse the obtained sample (NiCo / NF) with methanol and secondary water, and dry it naturally for later use. .

[0029] (2) Dissolve 0.75mmol of ferrous sulfate in 10.0ml of secondary water, stir to dissolve it completely, then immerse the NiCo / NF sample obtained in the above steps for 0.5 hours, and take out the obtained sample after the end (NiCoFe / NF NF-0.5h) and rinsed with secondary water, dried for testing.

Embodiment 2

[0031] (1) Dissolve 0.60mmol of nickel acetate, 3.0mmol of cobalt acetate and 10.0mmol of 2-methylimidazole into 40.0ml of anhydrous methanol, sonicate for 20 minutes to fully dissolve, then transfer to a 100ml reaction kettle and put Add the pretreated nickel foam, set the temperature at 130°C, and the reaction time is 15 hours. After the reaction is completed, let it cool naturally and rinse the obtained sample (NiCo / NF) with methanol and secondary water, and dry it naturally for later use. .

[0032] (2) Dissolve 0.75mmol of ferrous sulfate in 10.0ml of secondary water, stir to dissolve it completely, then immerse the NiCo / NF sample obtained in the above steps for 1.0 hour, and take out the obtained sample after the end (NiCoFe / NF NF-1.0h) and rinsed with secondary water, dried for testing.

Embodiment 3

[0034] (1) Dissolve 0.60mmol of nickel acetate, 3.0mmol of cobalt acetate and 10.0mmol of 2-methylimidazole into 40.0ml of anhydrous methanol, sonicate for 20 minutes to fully dissolve, then transfer to a 100ml reaction kettle and put Add the pretreated nickel foam, set the temperature at 130°C, and the reaction time is 15 hours. After the reaction is completed, let it cool naturally and rinse the obtained sample (NiCo / NF) with methanol and secondary water, and dry it naturally for later use. .

[0035] (2) Dissolve 0.75mmol of ferrous sulfate in 10.0ml of secondary water, stir to dissolve it completely, then immerse the NiCo / NF sample obtained in the above steps for 2.0 hours, and take out the obtained sample after the end (NiCoFe / NF NF-2.0h) and rinsed with secondary water, dried for testing.

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Abstract

The invention belongs to the technical field of electrocatalysis, and specifically relates to a preparation method of a non-noble metal NiCoFe / NF electrocatalyst and application of the electrocatalyst to oxygen evolution. The catalyst is mainly prepared by a hydrothermal reaction and a metal cation exchange reaction at room temperature in two steps, wherein in the first step, Ni-doped Co-MOF is grown on foam nickle in situ as a precursor for the next step of reaction; in the second step, obtained NiCo / NFis immersed in an aqueous solution containing ferrous sulfate, and after drying, the NiCoFe / NF catalyst is obtained. The catalyst obtained by the method can achieve the electric current density of 10 mA / cm<2> with only 252 mV of overpotential, has excellent long-term stability at the same time, and has higher oxygen evolution activity compared with other traditional non-noble metal catalysts. The preparation method involved in the invention is simple; raw materials are abundant and easy to get; large-scale production potential is realized.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a preparation method of a non-noble metal NiCoFe / NF electrocatalyst and its application of oxygen evolution. Background technique [0002] With the consumption of traditional fossil energy (oil, natural gas, coal, etc.), energy shortage and environmental pollution have attracted more and more attention. Hydrogen, which has the advantages of high energy density, water reaction product and environmental friendliness, is considered to be one of the most ideal green energy sources in the future, and electrochemical water dissociation provides a very simple and efficient method for people to produce high-purity hydrogen . However, the oxygen evolution reaction (OER) at the anode is a four-electron transfer process with slow kinetics throughout the water electrolysis process, which largely limits the efficiency of hydrogen production. At the same time, noble meta...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/10C25B11/06C25B1/04
CPCB01J23/755C25B11/04C25B1/04B01J35/33B01J35/61Y02E60/36
Inventor 冯媛媛扈华帅刘瑞杰司思王重斌
Owner QUFU NORMAL UNIV
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