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A kind of preparation method of au-n-c oxygen reduction electrocatalyst derived from zif-8

A technology of ZIF-8 and electrocatalyst, which is applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of limiting fuel cell high-efficiency energy conversion, high price, poor stability, etc., achieve superior methanol poisoning resistance, and simple preparation process , cheap effect

Active Publication Date: 2021-08-10
UNIV OF JINAN
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Problems solved by technology

However, the ORR efficiency is low, which limits the efficient energy conversion of fuel cells.
At present, commercial platinum carbon is recognized as the catalyst with the best performance. However, it is expensive due to its scarcity of reserves, and its practical application is limited by its poor stability and easy poisoning.

Method used

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  • A kind of preparation method of au-n-c oxygen reduction electrocatalyst derived from zif-8
  • A kind of preparation method of au-n-c oxygen reduction electrocatalyst derived from zif-8
  • A kind of preparation method of au-n-c oxygen reduction electrocatalyst derived from zif-8

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Embodiment 1

[0022] (1) Preparation and characterization of Au-N-C electrocatalyst: 1.68 g Zn(NO 3 ) 6H 2 O was added to 20 mL of methanol, and the resulting mixed solution was marked as A; then 4.00 g of dimethylimidazole was added to 60 mL of methanol, and the resulting mixed solution was marked as B; then solution A was quickly added to the solution under vigorous stirring In B, react at room temperature for 24 h; finally, the obtained product was centrifuged and washed several times, and vacuum-dried at 70°C overnight, and the obtained product was ZIF-8; 200 mg of ZIF-8 just prepared was added to 50 mL of methanol and ultrasonically dispersed for 20 Minutes, add 20 mg of chloroauric acid into the above solution and stir vigorously. After 12 hours, centrifuge and wash with the same method as above, and dry in vacuum to obtain Au / Zn ZIF; prepare a buffer solution (10Mm, PH=8.5), and prepare Au / Zn Zn ZIF was dispersed in 50 mL buffer solution and ultrasonically dispersed for 20 minutes, ...

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Abstract

The present invention provides a kind of preparation method of Au-N-C oxygen reduction electrocatalyst derived from ZIF-8, Zn(NO 3 ) 2 ·6H 2 O is added in methanol, and the mixed solution obtained is designated as A; then dimethylimidazole is added in methanol, and the mixed solution obtained is designated as B; then solution A is quickly added to solution B under vigorous stirring, and reacted at room temperature; Washing, vacuum drying, the product is ZIF‑8; adding methanol to the product, ultrasonic dispersion, adding chloroauric acid to stir, centrifugal washing, vacuum drying, to obtain Au / Zn ZIF; dispersing into the buffer solution, adding polydopamine quickly, After stirring, it was centrifuged and washed, dried in vacuum, heated and kept in a nitrogen atmosphere, and the product obtained was designated as Au‑N‑C. The obtained Au‑N‑C catalyst has a half-wave potential of 0.8 V in alkaline conditions, has good resistance to methanol poisoning and superior stability, and is expected to replace commercial platinum carbon.

Description

technical field [0001] The invention relates to a preparation method of a ZIF-8 derived Au-N-C oxygen reduction electrocatalyst, belonging to the technical field of non-noble metal catalysts in electrocatalysis. Background technique [0002] The extensive use of fossil fuels in the world has led to a series of environmental problems. As a new type of energy conversion device, fuel cells, in which oxygen reduction reaction (ORR) is an important cathode reaction. The content of oxygen in air is relatively high (21%), so air can be directly used as the source of oxygen required for the cathode reaction. However, the ORR efficiency is low, which limits the efficient energy conversion of fuel cells. At present, commercial platinum carbon is recognized as the catalyst with the best performance. However, it is expensive due to the scarcity of reserves, and its practical application is limited due to its poor stability and easy poisoning. [0003] In order to reduce the cost of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9041H01M4/9083H01M2004/8689Y02E60/50
Inventor 逯一中张华星姜媛媛陈传霞倪朋娟王波张成会
Owner UNIV OF JINAN
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