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Oxygen evolution reaction electrocatalyst and preparation method thereof

A technology of electrocatalyst and oxygen evolution reaction, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. High potential and other problems, to achieve the effect of good dispersion, simple equipment, and convenient operation

Inactive Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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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 solve the problems of high price, low catalytic current density, high overpotential, poor stability and complex synthesis method in the existing OER catalyst, and provide a simple and rapid synthesis method of nickel-iron alloy, and under alkaline conditions Use it for OER catalyst

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  • Oxygen evolution reaction electrocatalyst and preparation method thereof
  • Oxygen evolution reaction electrocatalyst and preparation method thereof
  • Oxygen evolution reaction electrocatalyst and preparation method thereof

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preparation example Construction

[0014] The preparation method of the electrocatalyst for the oxygen evolution reaction provided by the present invention is that without the protection of an inert gas, under the protection condition of an ice-water bath, sodium borohydride (NaBH 4 ) solution is quickly added to the solution containing ferrous ions or mixed metal ions in the solution I reaction technical scheme. The technical scheme adopts the liquid phase reduction method to prepare nanometer zero-valent nickel-iron particles. Under the protection of no inert gas, the ferrous salt or the mixed metal salt of ferrous salt and nickel salt is dissolved in distilled water, stirred and mixed evenly, and placed in an ice water bath. Under the protection, the corresponding amount of NaBH 4 The solution is quickly poured into the salt solution, the color of the solution turns black immediately, and the liquid phase reduction reaction is carried out under stirring conditions for about 20-35 minutes, and the ferrous ion...

Embodiment approach

[0022] (1) ice-water bath protection, nickel chloride and ferrous sulfate heptahydrate are dissolved in water to prepare solution I;

[0023] In solution I, the total concentration of nickel ions and ferrous ions is 0.14mol / L to 0.16mol / L, and the molar ratio of nickel ions to ferrous ions is 0 to 0.4; preferably 0 to 0.3; more preferably 0.05 to 0.2; most preferably 0.1.

[0024] (2) Pour the sodium borohydride aqueous solution whose concentration is 0.7mol / L~1.1mol / L into the above-mentioned solution I rapidly, make the amount of the substance of sodium borohydride be 5~7 times of the metal ion total amount in the solution I; Continue to stir and react for 20-35 minutes; the obtained product is first washed with deionized water to pH = 7, then washed with absolute ethanol, dispersed in acetonitrile after centrifugal separation, and dried in a low-temperature freezer.

[0025] An oxygen evolution reaction electrocatalyst further provided by the present invention is prepared ...

Embodiment 1

[0039] Weigh 0.83 g of ferrous sulfate heptahydrate, dissolve it in 20 ml of water, and protect it in an ice-water bath. The concentration of ferrous sulfate is 0.15 moles per liter. Quickly pour 20 milliliters of 0.9 mol per liter sodium borohydride solution into the ferrous sulfate solution, and continue to stir and react for 30 minutes. Wash with water until pH = 7, then wash once with absolute ethanol and centrifuge. Disperse the product in acetonitrile, and dry it in vacuum at low temperature in a freeze dryer. Metallic Fe particles with a size of 10-100 nm were obtained. The obtained black powder and 5 mg of XC-72 were weighed and dispersed in 2 mL of isopropanol, then 50 μL of Nafion (5%) solution was added, and ultrasonically oscillated for 30 min to mix uniformly to obtain a catalyst slurry. Then pipette 20 μL of the catalyst slurry onto a rotating disk electrode with a diameter of 5 mm, and let it dry naturally in the air. The obtained electrode was evaluated for...

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Abstract

The invention discloses an oxygen evolution reaction electrocatalyst and a preparation method thereof, wherein the preparation method comprises the following steps: under a condition of ice water bath protection, quickly adding a sodium borohydride (NaBH4) solution to a solution I, and carrying out a stirring reaction, wherein the solution I is a ferrous salt solution, or a mixed solution of a ferrous salt and a nickel salt. The method does not need nitrogen gas protection, the equipment requirements are relatively low, and the principle of the method is relatively simple; the reaction is rapid, the preparation is quick, and the electrocatalyst can be produced in quantity in a short time. The catalyst prepared by the method is applied in catalysis of oxygen evolution reaction (OER) under an alkaline condition, shows excellent catalytic activity, has higher OER activity and better stability than commercial IrO2 catalysts, and has low price.

Description

technical field [0001] The invention belongs to the field of electrochemical catalysts, in particular to a method for preparing a nano-nickel-iron alloy which can be used to catalyze oxygen evolution reaction. Background technique [0002] As we all know, while traditional fossil fuels are on the verge of depletion, they also bring continuous pollution to the world. Human beings are facing severe energy problems, and there is an urgent need to promote the conversion of renewable energy and the development of energy storage technology. The electricity generated by continuous solar and wind energy needs to be stored, and renewable fuel cells provide a possible way to store and utilize intermittent energy such as solar energy and wind energy. Renewable fuel cell A new energy conversion and storage technology combining hydrogen-oxygen fuel cell and water electrolysis, through (2H 2 +O 2 →2H 2 O+electric energy) and (2H 2 O+electric energy→2H 2 +O 2 ) process can be cycled,...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/745B82Y30/00B82Y40/00C25B11/06C25B1/04
CPCY02E60/36
Inventor 杨维慎朱凯月朱雪峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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