A kind of preparation method of PD-N-C oxygen reduction electrocatalyst derived from ZIF-8

A ZIF-8, electrocatalyst technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of restricting efficient energy conversion of fuel cells, expensive, scarce reserves, etc., to achieve excellent resistance to methanol poisoning ability, simple preparation process , the effect of rich raw materials

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 PD-N-C oxygen reduction electrocatalyst derived from ZIF-8
  • A kind of preparation method of PD-N-C oxygen reduction electrocatalyst derived from ZIF-8

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Embodiment 1

[0019] (1) Preparation and characterization of Pd-N-C electrocatalyst: 1.68 g Zn(NO 3 ) 2 •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, 17.3 mg sodium chloropalladate was added to the above solution and stirred vigorously. After 12 hours, it was centrifuged and washed in the same way as above, and dried in vacuum to obtain Pd / Zn ZIF; prepare a buffer solution (10Mm, PH=8.5), and prepare the prepared Pd / ZnZIF was dispersed into 50mL buffer solution and ultrason...

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Abstract

The present invention provides a kind of preparation method of Pd-N-C oxygen reduction electrocatalyst derived from ZIF-8, Zn(NO 3 ) 2 •6H 2 O was added to methanol, and the resulting mixed solution was denoted as A; then dimethylimidazole was added into methanol, and the resulting mixed solution was denoted as B; then solution A was added to solution B under vigorous stirring, and reacted at room temperature; , vacuum-dried, the product is ZIF-8; the product is added to methanol, after ultrasonic dispersion, sodium chloropalladate is added to stir vigorously, centrifugally washed, and vacuum-dried to obtain Pd / Zn ZIF; the prepared Pd / Zn ZIF is dispersed in the buffer solution, polydopamine was quickly added, stirred, centrifuged and washed, and vacuum-dried to obtain the product as Pd / Zn@PDA ZIF; heated and kept in a nitrogen atmosphere to obtain the product as Pd-N-C. The prepared catalyst has better conductivity 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 Pd-N-C oxygen reduction electrocatalyst, belonging to the technical field of non-precious 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/92B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/921H01M4/926H01M2004/8689Y02E60/50
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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