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

A dual-functional catalyst and transition metal technology, applied in physical/chemical process catalysts, chemical instruments and methods, electrolysis processes, etc., to achieve good methanol resistance, optimized electronic structure and geometric atom rearrangement, and good catalytic performance

Active Publication Date: 2021-12-17
山西师范大学
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  • Abstract
  • Description
  • Claims
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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 transition metal-nitrogen co-doped carbon material oxygen reduction / oxygen evolution dual-function catalyst, which is complexed with metal ions by a low-cost complexing agent-potassium ferricyanide The method prepares a transition metal-nitrogen co-doped carbon material oxygen reduction / oxygen evolution bifunctional catalyst, the operation steps are simple, no need to add a metal reducing agent or a nitrogen dopant separately, so that the doping elements can be distributed uniformly, and the catalyst surface The high dopant content 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

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  • Preparation method of a transition metal-nitrogen co-doped carbon material oxygen reduction/oxygen evolution bifunctional catalyst
  • Preparation method of a transition metal-nitrogen co-doped carbon material oxygen reduction/oxygen evolution bifunctional catalyst
  • Preparation method of a transition metal-nitrogen co-doped carbon material oxygen reduction/oxygen evolution bifunctional 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] Mix the iron salt aqueous solution with the cobalt salt solution under stirring conditions, and stir for 0.5h to 1.0h to obtain the first mixed solution, wherein the iron salt aqueous solution is potassium ferricyanide aqueous solution;

[0031] Mixing the silver salt aqueous solution with the first mixed solution under stirring conditions, stirring and reacting for 10.0h to 14.0h to obtain the second mixed solution;

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

[0033] Calcining the catalyst at 500° C. to 900° C. for 1.0 h to 3.0 h in an inert atmospher...

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 to 100mL of cobalt salt solution, continue to stir for 45min, then add 10mL of silver salt solution dropwise to 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 gas a...

Embodiment 2

[0051] Dissolve 0.01mol of cobalt nitrate and 0.01mol 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.

[0052] Under the condition of magnetic stirring, add 70mL of iron salt solution dropwise to 100mL of cobalt salt solution, continue to stir for 45min, then add 10mL of silver salt solution dropwise to 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 a...

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Abstract

The invention discloses a preparation method of a transition metal-nitrogen co-doped carbon material oxygen reduction / oxygen precipitation bifunctional catalyst. The transition metal in the catalyst includes silver, cobalt and iron, and the molar ratio of silver, cobalt and iron in the catalyst is 1 :(8~12):(5~9). The above-mentioned transition metal-nitrogen co-doped carbon material oxygen reduction / oxygen evolution bifunctional catalyst is prepared by a low-cost complexing agent and metal ion complexing method, which has the characteristics of low cost, simple operation and easy synthesis, and does not require additional metal reducing agent Or the nitrogen dopant is added separately, so that the distribution of the doping element can be uniform, the content of the dopant on the surface of the catalyst is high, and problems such as agglomeration of metal particles can be effectively avoided, thereby improving the catalytic performance. It shows high ORR and OER catalytic activity and stability in alkaline solution, and has good resistance to methanol, and shows good catalytic performance in zinc-air batteries.

Description

technical field [0001] The invention belongs to the technical field of non-noble metal catalysts, in particular to a preparation method of a 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 electrolyzed 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 two reactions, ORR and OER, have played an important role in the field of renewable energy technologies. Currently, noble metals (such as platinum, ruthenium, and iridium) and their alloys exhibit excellent electrochemical performance for both reactions. However, these precious...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C25B1/04C25B11/091H01M4/90
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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