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A kind of oxygen evolution reaction electrocatalyst, its preparation method and application

An oxygen evolution reaction and electrocatalyst technology, which is applied in the field of preparation of β-Ni2 nanorods, can solve the problems of high overpotential, high price, complex synthesis method, etc., and achieves the effects of good OER activity, convenient operation and simple equipment.

Active Publication Date: 2021-05-07
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 present invention aims to propose a solution to the existing OER catalysts that are expensive, low in catalytic current density, high in overpotential, poor in stability and complex in synthesis methods

Method used

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  • A kind of oxygen evolution reaction electrocatalyst, its preparation method and application
  • A kind of oxygen evolution reaction electrocatalyst, its preparation method and application

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preparation example Construction

[0013] The invention provides a preparation method of an oxygen evolution reaction electrocatalyst and a catalyst prepared thereby. The oxygen evolution reaction electrocatalyst is Fe 3+ Doped β-Ni(OH) 2 .

[0014] The present invention firstly provides a preparation method of an oxygen evolution reaction electrocatalyst. The present invention is based on an improved atomic-level topological chemical conversion method. Under the protection of an inert gas, the divalent Fe-doped Doped β-Ni(OH) 2 , and then oxidized in an oxidative atmosphere by atomic-level topological chemical conversion method to generate trivalent Fe-doped β-Ni(OH) 2 catalyst.

[0015] The above-mentioned method of the present invention comprises the steps of mixing the nickel-iron salt solution and the alkali solution, and exposing the mixed system to an oxidizing atmosphere.

[0016] Wherein, the ferrous nickel salt solution is a solution obtained by dissolving soluble ferrous salt and soluble nickel ...

Embodiment 1

[0038] Weigh 2.7801 grams of nickel sulfate hexahydrate and dissolve it in 20 milliliters of water, the concentration of nickel sulfate is 0.5 moles per liter. Under the protection of nitrogen atmosphere, 20mL of 0.5mol / L nickel sulfate solution was added dropwise into 80mL of 1.25mol / L potassium hydroxide solution, and the dropwise addition was completed in 20min. The reaction temperature was 80°C. Then the cloudy system was exposed to the air and reacted for 5h. Finally, it was washed with water until pH = 7, washed three times with absolute ethanol, and then centrifuged. Disperse the product in ethanol, and dry it in a low-temperature vacuum in a freeze dryer. A green powder was obtained. Weigh the obtained green powder and 5 mg of XC-72 and disperse in 2 mL of isopropanol, then add 50 μL of Nafion (5%) solution, and ultrasonically shake for 30 min to mix evenly to obtain a catalyst slurry. Then pipette 20 μL of the above catalyst slurry onto a rotating disk electrode wi...

Embodiment 2

[0040] Weigh 0.2628 grams of ferrous sulfate heptahydrate and 2.5021 grams of nickel sulfate hexahydrate and dissolve them in 20 milliliters of water. The total concentration of ferrous sulfate and nickel sulfate is 0.5 moles per liter. Under the protection of nitrogen atmosphere, 20mL of 0.5mol / L nickel sulfate solution was added dropwise into 80mL of 1.25mol / L potassium hydroxide solution, and the dropwise addition was completed in 20min. The reaction temperature was 80°C. Then the cloudy system was exposed to the air and reacted for 5h. Finally, it was washed with water until pH = 7, washed three times with absolute ethanol, and then centrifuged. Disperse the product in ethanol, and dry it in a low-temperature vacuum in a freeze dryer. A yellow-brown powder was obtained. The obtained yellow-brown 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 uniforml...

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Abstract

The present invention relates to an electrocatalyst for oxygen evolution reaction, its preparation method and application, the method comprises the step of exposing the mixed system of nickel-iron salt solution and alkali solution to an oxidative atmosphere for reaction; the nickel-iron salt solution is Soluble ferrous salt and soluble nickel salt are dissolved in water and uniformly mixed the resulting solution; described soluble ferrous salt is selected from ferrous sulfate, ferrous chloride or ferrous acetate; described soluble nickel salt is selected from nickel sulfate, Nickel chloride or nickel acetate. The equipment required for producing the OER catalyst by the method of the invention is simple, easy to operate and low in cost. Fe produced at the same time 3+ Doped β‑Ni(OH) 2 The catalyst presents a nanorod-like microscopic morphology, which has good OER activity, and its activity and stability are superior to the previously reported NiFe layered double hydroxide and the current best-performing IrO. 2 . Therefore, it can be used as an electrocatalyst in the fields of renewable fuel cells, rechargeable metal-air batteries, electrolyzed water, etc.

Description

technical field [0001] The invention belongs to the field of preparation of electrochemical catalysts, and relates to a class of Fe that can be used to catalyze oxygen evolution reaction (OER). 3+ Doped β-Ni(OH) 2 Preparation method of nanorods. Background technique [0002] In modern society, people's basic necessities of life are closely related to energy supply and consumption. For example, cooking, heating, lighting, transportation, and industrial production are all inseparable from energy. It can be said that there would be no modern civilization without the energy industry. In addition, fossil energy is an unclean energy. While meeting most of people's energy needs, it also discharges a large amount of waste water, waste gas, and waste residue into nature, causing acid rain hazards, greenhouse effects, ozone layer destruction, and the threat of chemical time bombs. and other global environmental issues. In the 21st century, with the continuous development of the gl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90B01J23/755B82Y30/00B82Y40/00
CPCB01J23/755B82Y30/00B82Y40/00H01M4/88H01M4/9016Y02E60/50
Inventor 杨维慎朱凯月朱雪峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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