Preparation method of novel transition metal-nitrogen co-doped carbon material oxygen reduction/oxygen evolution difunctional catalyst

A bifunctional catalyst, transition metal technology, applied in physical/chemical process catalysts, chemical instruments and methods, electrolysis processes, etc., to achieve the effects of avoiding agglomeration, low cost, and high dopant content

Active Publication Date: 2019-09-27
山西师范大学
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of a novel transition metal-nitrogen co-doped carbon material oxygen reduction / oxygen evolution dual-functional catalyst, through the low-cost complexing agent-potassium ferricyanide and metal ion complex The transition metal-nitrogen co-doped carbon material oxygen reduction / oxygen evolution dual-functional catalyst is prepared by a combined method. The operation steps are simple, and there is no need to add a metal reducing agent or a nitrogen dopant separately, so that the doping elements can be distributed uniformly, and the surface of the catalyst The high content of dopants and the ability to effectively avoid problems such as metal particle agglomeration, thereby improving the catalytic performance of the prepared transition metal-nitrogen co-doped carbon material oxygen reduction / oxygen evolution bifunctional catalyst

Method used

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  • Preparation method of novel transition metal-nitrogen co-doped carbon material oxygen reduction/oxygen evolution difunctional catalyst
  • Preparation method of novel transition metal-nitrogen co-doped carbon material oxygen reduction/oxygen evolution difunctional catalyst
  • Preparation method of novel transition metal-nitrogen co-doped carbon material oxygen reduction/oxygen evolution difunctional catalyst

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preparation example Construction

[0028] A method for preparing a transition metal-nitrogen co-doped carbon material oxygen reduction / oxygen evolution bifunctional catalyst according to an embodiment of the present invention comprises the following steps:

[0029] mixing cobalt salt, surfactant and deionized water to prepare cobalt salt solution;

[0030] Under the condition of stirring, mix the iron salt solution with the cobalt salt solution, stir and react for 0.5h to 1.0h, and obtain the first mixed solution, wherein the iron salt solution is potassium ferricyanide solution;

[0031] Mix the silver salt aqueous solution with the first mixed solution under stirring conditions, and stir and react for 10.0h to 14.0h to prepare the second mixed solution;

[0032] Filter the second mixed solution, wash the filter residue and dry at 70°C to 90°C for 10.0h to 14.0h to obtain a catalyst precursor;

[0033] The catalyst is calcined at 500°C to 900°C for 1.0h to 3.0h in an inert atmosphere to prepare a transition m...

Embodiment 1

[0047] Dissolve 0.01mol of cobalt nitrate and 0.05mol of surfactant in deionized water to 1000mL to obtain a cobalt salt solution; dissolve 0.01mol of potassium ferricyanide to 1000mL in deionized water to obtain an iron salt Aqueous solution: Dissolve 0.01 mol of silver nitrate in deionized water to a volume of 1000 mL to obtain a silver salt solution.

[0048] Under the condition of magnetic stirring, add 70mL of iron salt solution dropwise into 100mL of cobalt salt solution, continue to stir for 45min, then add 10mL of silver salt solution dropwise into the above mixture under stirring, continue to stir for 12h , filtered, and the resulting filter residue was washed with ethanol and deionized water in sequence, and dried at 80° C. for 12 hours to obtain a catalyst precursor.

[0049] Grind the catalyst precursor into powder, take a certain amount of catalyst precursor and put it in a porcelain boat in a tube furnace, raise the temperature to 700°C at 5.0°C / min in an inert g...

Embodiment 2

[0051] Dissolve 0.01mol of cobalt nitrate and 0.01mol of surfactant in deionized water to 1000mL to obtain cobalt salt solution; dissolve 0.01mol of potassium ferricyanide to 1000mL in deionized water to obtain iron salt Aqueous solution: Dissolve 0.01 mol of silver nitrate in deionized water to a volume of 1000 mL to obtain a silver salt solution.

[0052] Under the condition of magnetic stirring, add 70mL of iron salt solution dropwise into 100mL of cobalt salt solution, continue to stir for 45min, then add 10mL of silver salt solution dropwise into the above mixture under stirring, continue to stir for 12h , filtered, and the resulting filter residue was washed with ethanol and deionized water in sequence, and dried at 80° C. for 12 hours to obtain a catalyst precursor.

[0053] Grind the catalyst precursor into powder, take a certain amount of catalyst precursor and put it in a porcelain boat in a tube furnace, raise the temperature to 500°C at 0.5°C / min in an inert gas at...

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Abstract

The invention discloses a preparation method of a novel transition metal-nitrogen co-doped carbon material oxygen reduction/oxygen evolution difunctional catalyst. Transition metal in the catalyst comprises silver, cobalt and iron, and the molar ratio of the silver to the cobalt to the iron in the catalyst is 1 to (8-12) to (5-9). The transition metal-nitrogen co-doped carbon material oxygen reduction/oxygen evolution difunctional catalyst is prepared by using a low-cost complexing agent and a metal ion complexing method, and has the characteristics of low cost, simple operation and easy synthesis; additional metal reducing agent or separate addition of a nitrogen dopant is not needed, so that doping elements can be uniformly distributed; the content of a doppant on the surface of the catalyst is high, and the problem of agglomeration of metal particles and the like can be effectively avoided, thereby improving the catalytic performance. Relatively high ORR (Oxidation-reduction reaction) and OER (Oxygen evolution reaction) catalytic activity and stability in an alkaline solution are exhibited; meanwhile, relatively good resistance to methanol is realized; the catalyst has relatively good catalytic performance when applied to zinc-air batteries.

Description

technical field [0001] The invention belongs to the technical field of non-precious metal catalysts, in particular to a preparation method of a novel transition metal-nitrogen co-doped carbon material oxygen reduction / oxygen precipitation bifunctional catalyst. Background technique [0002] With the increasing energy crisis and damage to the ecological environment, fuel cells, metal-air batteries and electrolytic water technologies are considered to be effective and clean energy storage devices to replace fossil fuels. Oxidation-Reduction Reaction (ORR) and Oxygen Evolution Reaction (OER) are critical reactions in electrochemical energy storage devices. Bifunctional catalysts with high catalytic activity for the two reactions of ORR and OER have played an important role in the field of renewable energy technology. Currently, noble metals (such as platinum, ruthenium, and iridium) and their alloys exhibit excellent electrochemical performance for both reactions. However, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C25B1/04C25B11/06H01M4/90
CPCB01J35/0033B01J27/24C25B1/04H01M4/9041C25B11/04H01M4/9083Y02E60/36Y02E60/50
Inventor 王瀛胡天军胡琳果袁宏杰
Owner 山西师范大学
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