Preparation method of ZIF-8 derived Au-N-C oxygen reduction electrocatalyst

A ZIF-8, electrocatalyst technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of limiting the efficient energy conversion of fuel cells, high price, poor stability, etc., to achieve excellent resistance to methanol poisoning ability, simple preparation process , the effect of low price

Active Publication Date: 2020-12-25
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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  • Preparation method of ZIF-8 derived Au-N-C oxygen reduction electrocatalyst
  • Preparation method of ZIF-8 derived Au-N-C oxygen reduction electrocatalyst
  • Preparation method of ZIF-8 derived Au-N-C oxygen reduction electrocatalyst

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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 invention provides a preparation method of a ZIF-8 derived AuNC oxygen reduction electrocatalyst, which comprises the following steps of: adding Zn (NO3) 2.6 H2O into methanol to obtain a mixed solution, and marking the mixed solution as A; then adding dimethylimidazole into methanol to obtain a mixed solution, and marking the mixed solution as B; then rapidly adding the solution A into the solution B under violent stirring, and reacting at room temperature; washing and drying in vacuum to obtain a product ZIF8; adding methanol into the product, carrying out ultrasonic dispersion, adding chloroauric acid, stirring, carrying out centrifugal washing, and carrying out vacuum drying to obtain Au / Zn ZIF; and dispersing the Au / Zn ZIF into a buffer solution, quickly adding polydopamine, stirring, centrifugally washing, drying in vacuum, and heating and preserving heat in a nitrogen atmosphere to obtain a product marked as Au-N-C. The half-wave potential of the obtained Au-N-C catalyst is0.8 V under the alkaline condition, and the Au-N-C catalyst has good methanol poisoning resistance and excellent 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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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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