Preparation method of alkali oxygen evolution reaction electrocatalyst

An oxygen evolution reaction, electrocatalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of poor stability, catalytic overpotential, etc., and achieve stable Good performance, increased specific surface area, strong repeatability

Inactive Publication Date: 2017-05-31
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is mainly to solve the problems of high catalytic overpotential and poor stability of the existing oxygen evolution reaction catalyst in the process of catalytic water splitting, and to provide a transition metal-doped catalyst with nano-array multi-level structure. The alkaline oxygen evolution reaction electrocatalyst greatly reduces the overpotential and peak potential of the oxygen evolution reaction, and improves the stability of the catalytic reaction. ideas and strategies

Method used

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  • Preparation method of alkali oxygen evolution reaction electrocatalyst
  • Preparation method of alkali oxygen evolution reaction electrocatalyst
  • Preparation method of alkali oxygen evolution reaction electrocatalyst

Examples

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Embodiment 1

[0035] The conductive substrate is nickel foam, the cobalt source is cobalt nitrate, and the reducing agent is sodium borohydride.

[0036] (1) Use nickel foam as a conductive substrate in 5 mol / liter hydrochloric acid for ultrasonic cleaning for 10 minutes, then transfer to an acetone solution for ultrasonic cleaning for 10 minutes, then transfer to an ethanol solution for ultrasonic cleaning for 10 minutes, and finally fully clean it with deionized water The conductive substrate was rinsed and placed in an oven at 60°C for drying.

[0037] (2) Prepare a precursor solution, including 0.03516 mol / L cobalt nitrate, 0.01172 mol / L manganese nitrate, 0.2 mol / L ammonium fluoride, and 0.25 mol / L urea. The solution was magnetically stirred for 10 minutes and then transferred to the reactor, and then the foamed nickel treated in step (1) was put into the reactor obliquely, then the reactor was covered and tightened, and placed in a drying oven to heat up to 100°C. The time is set to ...

Embodiment 2

[0057] The preparation method of this electrocatalytic material is basically the same as that of Example 1, the difference is that the amount of sodium hydroxide and sodium borohydride in step (4) is different, respectively 3M and 0M, and the material is named NaOH@Mn x co 3-x o 4 -1:3. Embodiment 2 can achieve the object of the invention.

Embodiment 3

[0059] The preparation method of this electrocatalytic material is basically the same as that of Example 1, the difference being that the amount of sodium hydroxide and sodium borohydride in step (4) is different, respectively 0M and 1M. The material is named as NaBH 4 @Mn x co 3-x o 4 -1:3. Embodiment 3 can achieve the object of the invention.

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Abstract

The invention discloses a preparation method of an alkali oxygen evolution reaction electrocatalyst. The preparation method comprises the following steps: firstly, carrying out ultrasonic cleaning on a conductive substrate, then preparing aqueous solution with soluble cobalt salt, soluble manganese salt, ammonium fluoride and urea, and in a reaction kettle, vertically growing a manganese cobalt subcarbonate nano array multilevel structure on the surface of the substrate; then preparing aqueous solution with soluble alkali and a reducing agent, carrying out secondary treatment, and carrying out structure and performance optimization on the manganese cobalt subcarbonate nano array multilevel structure; finally, in a tube furnace, in nitrogen or argon atmosphere, carrying out calcination at a temperature of 200 to 1,000 DEG C to prepare the alkali oxygen evolution reaction electrocatalyst with a manganese-doped cobalt oxide nano array multilevel structure. The preparation method disclosed by the invention adopts a simple hydro-thermal synthesis/calcination treatment method, is simple in process and is easy to regulate and control; the prepared product is excellent in performance and is an electrocatalyst with wide prospect in the application process of alkali water decomposition.

Description

technical field [0001] The invention relates to an electrocatalyst, in particular to a preparation method of an alkaline oxygen evolution reaction electrocatalyst doped with a nano-array multilevel structure. Background technique [0002] There is no shortage of new energy sources, but there are still many problems in order to truly realize the output of new energy sources. Hydrogen energy from water splitting has good development prospects, but the key lies in the slow kinetics of the oxygen evolution reaction (OER) in the water splitting process, which seriously hinders the efficiency of the entire hydrogen production process. Therefore, the development of efficient oxygen evolution Reaction catalysts are an urgent requirement for human survival. There have been a lot of research on OER catalysts before, most of which are focused on metal-air batteries, fuel cells, etc., and even used as dual-functional catalysts in lithium batteries and the above-mentioned energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/02B01J37/08B01J37/10C25B11/06C25B1/04
CPCB01J23/002B01J23/8892B01J35/0033B01J35/02B01J37/088B01J37/10C25B1/04C25B11/04Y02E60/36
Inventor 罗俊吴朝文章立寒刘熙俊
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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