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Synthesizing method for Fe-N/C-20 by doping iron atoms and taking ZIF-8 as substrate

A ZIF-8, C-20 technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high price of precious metal catalysts, restricting industrial applications, low content, etc., to achieve good oxygen reduction activity, improve catalytic activity and The effect of stability

Inactive Publication Date: 2019-02-19
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high price and low content of noble metal catalysts are rare substances, which have always restricted their industrial applications.

Method used

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  • Synthesizing method for Fe-N/C-20 by doping iron atoms and taking ZIF-8 as substrate
  • Synthesizing method for Fe-N/C-20 by doping iron atoms and taking ZIF-8 as substrate
  • Synthesizing method for Fe-N/C-20 by doping iron atoms and taking ZIF-8 as substrate

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Embodiment 1

[0025] A kind of synthetic method taking ZIF-8 as the Fe-N / C-20 of substrate doping iron atom, comprises the following steps:

[0026] (1) Synthesis of ZIF-8:

[0027] First take Zn(NO 3 ) 2 ·6H 2 O was dissolved in methanol; then dimethylimidazole was dissolved in methanol, and then quickly poured into Zn(NO 3 ) 2 ·6H 2 O in methanol solution, stirred vigorously, and reacted at room temperature for 16h. The obtained white precipitate was centrifuged, washed several times with methanol, and then dried in vacuum at 60°C overnight to obtain a white solid powder ZIF-8;

[0028] (2) Synthesis of Fe-N / C-20 precursor doped with iron atoms:

[0029] Grind the white solid powder ZIF-8 in the step (1) into powder, put the ground powder and anhydrous phenanthroline into a beaker and add methanol, stir for 30min and add an appropriate amount of FeSO 7H O, then Evaporate to dryness in an oil bath at 70°C and grind to obtain a red solid powder, which is the Fe-N / C-20 precursor;

...

Embodiment 2

[0037] Synthesis of ZIF-8: Zn(NO 3 ) 2 ·6H 2 O 2.00g was dissolved in 30mL of methanol; 1.86g of dimethylimidazole was dissolved in 45mL of methanol, which was then quickly poured into Zn(NO 3 ) 2 ·6H 2 O in methanol solution, stirred vigorously, and reacted at room temperature for 16h. The obtained white precipitate was centrifuged, washed several times with methanol, and then dried under vacuum at 60° C. overnight to obtain ZIF-8.

[0038] Synthesis of Fe-N / C-20 precursor doped with iron atoms: Grind the white solid powder in (1) into powder, take 0.300g of powder and 0.136g of anhydrous phenanthroline and disperse them in 20mL of methanol for ultrasonication, After 30min, add 20mL containing 0.015gFeSO 4 ·7H 2 The O solution was then evaporated to dryness in an oil bath at 70°C and ground to obtain a red solid powder, namely the Fe-N / C-20 precursor.

[0039] Synthesis of Fe-N / C-20 doped with iron atoms: An appropriate amount of Fe-N / C-20 precursor was placed in a tu...

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Abstract

The invention discloses a synthesizing method for Fe-N / C-20 by doping iron atoms and taking ZIF-8 as a substrate and application in the catalyzing oxygen reduction reaction in alkaline, neutral and acid electrolytes. The method mainly comprises the following steps that at the indoor temperature, ZIF-8 with a regular shape is synthesized in methyl alcohol solvent; the ZIF-8 is dispersed in methyl alcohol, a certain amount of anhydrous phenanthroline and ferrous sulfate is added successively, the formed phenanthroline and ZIF-8 are stirred and dried, and the obtained red solid is ground into powder; the powder is subjected to high-temperature pyrolysis for 2 hours at the temperature of 900 DEG C under an argon inert atmosphere, and the Fe-N / C-20 is prepared. The oxygen reduction reaction catalyst capable of being prepared simply and applied widely is provided, has excellent catalyzing oxygen reduction performance under the alkaline, neutral and acidic conditions and can be applied to different occasions.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation methods, in particular to a method for synthesizing Fe-N / C-20 with ZIF-8 as a substrate and doped with iron atoms. Background technique [0002] Modern society is transitioning from a fossil fuel economy to a clean energy economy. The development of clean energy conversion and storage devices cannot wait. Batteries have long been recognized as efficient energy conversion and storage devices. Because fuel cells have the advantages of high energy conversion efficiency, low reaction temperature, and low pollution of products, fuel cells are very likely to become a way to solve environmental and energy problems. [0003] The main problem of the fuel cell at present is the catalyst activity and service life of the oxygen reduction reaction (oxygen reduction reaction, ORR). Pt / C is the first choice for ORR electrocatalyst due to its high activity, and it was widely used in the early stag...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9083Y02E60/50
Inventor 温珍海陈凯张驰李亚平
Owner NANCHANG HANGKONG UNIVERSITY
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