Preparation method of Ag-coated CoMoO4 oxygen evolution electrocatalyst

An electrocatalyst and catalyst technology, applied in chemical instruments and methods, electrodes, inorganic chemistry, etc., can solve problems such as poor durability, achieve good stability, good electrocatalytic performance, and increase current density.

Pending Publication Date: 2022-03-08
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, transition metal-based nanomaterials based on iron, cobalt, nickel, copper, molybdenum, and manganese have shown excellent electrochemical activity, but due to their poor durability in catalyzing the oxygen evolution reaction, especially in strong alkali Therefore, the development of efficient alkaline oxygen-producing electrocatalysts has become the top priority of current research.

Method used

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  • Preparation method of Ag-coated CoMoO4 oxygen evolution electrocatalyst
  • Preparation method of Ag-coated CoMoO4 oxygen evolution electrocatalyst
  • Preparation method of Ag-coated CoMoO4 oxygen evolution electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Add 375 mg of polyvinylpyrrolidone (55000) and 25 mL of 1,2-propanediol into 100 mL round bottom flasks respectively, and stir magnetically in an oil bath at 160 °C for 1 h. Add 250 μL of sodium chloride solution and 10 mL of silver nitrate solution, and continue the reaction for 40 min. After naturally cooling to room temperature, the resulting mixture was placed in a centrifuge tube, added acetone to 45 mL, and centrifuged (rotating at 8000 rpm for 5 min). Pour off the supernatant, add ethanol to 10 mL, ultrasonically disperse until uniform, add acetone to 45 mL, and centrifuge. Repeat the above operation. Disperse the product obtained above into 120 mL methanol, store it for later use, and the quantification is about 1 mg / mL.

[0038] Weigh 0.3284 g of 2-methylimidazole into a 50 mL round bottom flask, add 10 mL of methanol and 10 mL of silver nanowires, and stir magnetically. Weigh 0.291 g of cobalt nitrate hexahydrate and dissolve it in 20 mL of methanol, pour it...

Embodiment 2

[0041] Same as Example 1, except that the mixture of 10 mL of methanol and 10 mL of silver nanowires was changed to 20 mL of methanol solution, and other synthesis conditions were not changed, and CoMoO 4 catalyst.

Embodiment 3

[0043] The same as in Example 1, except that the mixture of 10 mL of methanol and 10 mL of silver nanowires was changed to a mixture of 5 mL of silver nanowires and 15 mL of methanol, and the other synthesis conditions were not changed, and Ag 5 @CoMoO 4 catalyst.

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PUM

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Abstract

The invention relates to the technical field of water electrolysis catalytic materials, in particular to a preparation method of an Ag-coated CoMoO4 oxygen evolution electrocatalyst. Comprising the following steps: (1) mixing polyvinylpyrrolidone with 1, 2-propylene glycol, stirring at a certain temperature, and then adding a sodium chloride solution and a silver nitrate solution with a certain concentration to prepare a silver nanowire solution; (2) purifying the silver nanowires with acetone and washing the silver nanowires for several times for later use; (3) weighing 2-methylimidazole, adding 2-methylimidazole into a mixed solution of different amounts of silver nanowires and methanol, adding a methanol solution of cobalt nitrate hexahydrate, dissolving the mixed solution in ethanol, and stirring at normal temperature; (4) adding sodium molybdate nonahydrate into the product obtained in the step (3), and carrying out hydrothermal reaction; after naturally cooling to room temperature, centrifugally collecting, washing with ethanol for multiple times, and drying to obtain the catalyst; the production cost is low, large-scale production is easy to achieve, the microstructure and good catalytic activity can be kept for a long time under the alkaline condition, and potential industrial application value is achieved in the aspect of electro-catalytic hydrogen production.

Description

technical field [0001] The invention relates to the technical field of electrolytic water catalytic materials, in particular to a preparation method of an Ag@CoMoO4 oxygen evolution electrocatalyst. Background technique [0002] The increasingly severe energy crisis and environmental pollution caused by fossil fuels have become two major obstacles to the sustainable development of human society. The development and storage of renewable energy has attracted widespread attention from domestic and foreign researchers. The electrochemical process can realize the mutual conversion of electrical energy and chemical energy stored in chemical bonds, which can be used to solve the following key problems involved in the process of energy storage and conversion: First, electrochemical energy conversion into charged interfaces reaction, so the conversion rate of the electrochemical cell is theoretically much higher than the traditional thermal efficiency; second, the electrochemical sys...

Claims

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Application Information

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IPC IPC(8): B22F1/16B22F1/054B22F9/24C25B1/04C25B11/091C01G51/00B82Y30/00B82Y40/00
CPCB22F9/24C25B11/091C25B1/04C01G51/00B82Y30/00B82Y40/00C01P2004/03C01P2002/72C01P2002/85C01P2006/40C01P2004/80Y02E60/36
Inventor 张美琳杨绍华温婷婷高义灏刘伟东弓亚琼
Owner ZHONGBEI UNIV
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