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A high-performance oxygen evolution cobalt diselenide/nickel tetraselenide@nc/c composite catalyst and its preparation method and application

A composite catalyst, high-performance technology, applied in the field of electrocatalysis, can solve the problem of non-conductivity, etc., and achieve the effect of improving poor conductivity, promoting comprehensive performance, and promoting improvement.

Active Publication Date: 2020-06-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal selenides do not have sufficient electrical conductivity and sufficient OER catalytic activity and stability to meet the requirements of practical applications.

Method used

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  • A high-performance oxygen evolution cobalt diselenide/nickel tetraselenide@nc/c composite catalyst and its preparation method and application
  • A high-performance oxygen evolution cobalt diselenide/nickel tetraselenide@nc/c composite catalyst and its preparation method and application
  • A high-performance oxygen evolution cobalt diselenide/nickel tetraselenide@nc/c composite catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0044] CoSe 2 / Ni 3 Se 4 Preparation of @NC / KB

[0045]Dissolve 1 mmol of cobalt nitrate hexahydrate, 1 mmol of nickel nitrate hexahydrate and 2 g of dicyandiamide in 20 mL of deionized water, ultrasonicate for 15 min, then stir the resulting mixture at 80°C and evaporate to dryness, and finally place the resulting solid mixture in a nitrogen atmosphere Under protection, the temperature was raised to 550°C at a rate of 5°C / min and kept for 2 hours. After the solid powder is cooled under the protection of nitrogen, it is taken out to obtain Ni / Co / CoO / NiCo 2 o 4 -g -C 3 N 4 .

[0046] Weigh 0.2g Ni / Co / CoO / NiCo 2 o 4 -g -C 3 N 4 Solid powder, 1g of selenium dioxide and 0.1g of Ketjen carbon were dispersed in 50mL of dimethylformamide aqueous solution (the volume of dimethylformamide and water was 5:2), stirred at room temperature for 1h and then transferred to an autoclave And keep it warm in a 200°C electric blast drying oven for 20h. After cooling at room temperatu...

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Abstract

The invention discloses a high-performance oxygen-evolution CoSn2 / Ni3Sn4@NC / C composite catalyst and a preparation method and application thereof. The composite catalyst is prepared in the step that cobalt-nickel selenide nano-particles and nitrogen-doped carbon are supported on a carbon material together. The preparation method comprises the steps that after a nitrogen-containing small organic molecule compound, cobalt salt and nickel salt are subjected to liquid mixing, a solvent is evaporated, drying is conducted, the mixture of the nitrogen-containing small organic molecule compound, the cobalt salt and the nickel salt is subjected to first calcination in a protective atmosphere, a calcined product and a carbon material are uniformly stirred in a dimethylformamide-water mixed solutionand then subjected to a solvothermal reaction, and a product obtained after the solvothermal reaction is subjected to second calcination in a protective atmosphere to obtain the high-performance oxygen-evolution CoSn2 / Ni3Sn4@NC / C composite catalyst. The preparation technology is simple, low in cost and beneficial for industrial production; when used in a storage and conversion system of renewableenergy sources, such as water splitting or metal-air secondary batteries, the composite catalyst prepared by using the method has the advantages of being high in activity and high in stability; compared with a commercial RuO2 catalyst, the high-performance oxygen-evolution CoSn2 / Ni3Sn4@NC / C composite catalyst is higher in combination property and shows a good application prospect.

Description

technical field [0001] The invention relates to an oxygen evolution (OER) catalyst and its preparation and application method, in particular to a high-performance oxygen evolution CoSe 2 / Ni 3 Se 4 @NC / C composite catalyst and its preparation method, also involving CoSe 2 / Ni 3 Se 4 The application of @NC / C composite catalyst in water splitting or metal-air secondary battery belongs to the field of electrocatalysis technology. Background technique [0002] Hydrogen is considered to be one of the most important new clean energy sources. Electrocatalytic water splitting to generate hydrogen and oxygen plays an important role in new energy fields such as fuel cells and hydrogen energy utilization. Electrolyzed water generates OH at the anode - or H 2 O oxidation to oxygen reaction (OER), generating H at the cathode 2 O reduction to hydrogen gas reaction (HER). where OER(2H 2 O→4H + +O 2 +4e – ) due to O-H bond breaking and subsequent O-O bond formation is an extre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/08B01J35/10H01M4/90H01M12/06C25B11/06C25B1/04
CPCB01J27/24B01J35/0033B01J35/1004B01J37/082C25B1/04C25B11/091H01M4/8647H01M4/9083H01M12/06Y02E60/10Y02E60/36Y02P20/133
Inventor 钱东刘桂雨张志良龙炫达李俊华徐德垚苏侃达
Owner CENT SOUTH UNIV
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