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ZIF-8-derived hollow Fe/Cu-N-C type oxygen reduction catalyst and preparation method and application thereof

A technology of ZIF-8 and catalyst, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high cost of Pt/C catalyst, easy poisoning of methanol, low stability, etc., and achieve low production cost, easy industrialization, The effect of improving stability

Inactive Publication Date: 2020-02-04
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In view of the shortcomings of the existing fuel cell Pt / C catalysts such as high cost, lack of resources, low stability, and easy poisoning of methanol, the present invention provides a hollow Fe / Cu-N-C oxygen reduction catalyst derived from ZIF-8 and Its preparation method and application

Method used

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  • ZIF-8-derived hollow Fe/Cu-N-C type oxygen reduction catalyst and preparation method and application thereof
  • ZIF-8-derived hollow Fe/Cu-N-C type oxygen reduction catalyst and preparation method and application thereof
  • ZIF-8-derived hollow Fe/Cu-N-C type oxygen reduction catalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0040] Synthesis of precursor 100nm size ZIF-8:

[0041] Weigh 0.84 g of zinc nitrate hexahydrate, dissolve it in 100 mL of methanol solution, and dissolve it completely by ultrasound to obtain a methanol solution of zinc nitrate hexahydrate; then take 1.61 g of 2-methylimidazole and dissolve in 100 mL of methanol solution In the process, ultrasonication is used to completely dissolve it to obtain a methanol solution of 2-methylimidazole; the two solutions obtained above are mixed and stirred at room temperature for 24 hours to obtain a white precipitate. Centrifuge the white precipitate and add it to 50mL methanol solution, reflux for 12h at 80°C, the obtained methanol solution of ZIF-8 is centrifuged and washed with methanol three times, and then dried under vacuum overnight at 60°C to obtain white solid powder ZIF-8 . The obtained white solid powder ZIF-8 was ground and vacuum activated at 200° C. for 2 h to obtain pure ZIF-8 with a size of 100 nm.

[0042] figure 1 This is a ...

Embodiment 2

[0044] Weigh 0.84 g of zinc nitrate hexahydrate, dissolve it in 50 mL of methanol solution, and dissolve it completely by ultrasound to obtain a methanol solution of zinc nitrate hexahydrate; then take 1.61 g of 2-methylimidazole and dissolve in 50 mL of methanol solution In the process, ultrasonication is used to completely dissolve it to obtain a methanol solution of 2-methylimidazole; the two solutions obtained above are mixed and stirred at room temperature for 12 hours to obtain a white precipitate. Centrifuge the white precipitate and add it to 100mL methanol solution, reflux at 80℃ for 12h, the obtained ZIF-8 methanol solution was centrifuged and washed with methanol three times, then dried under vacuum overnight at 60℃ to obtain white solid powder ZIF-8 . The obtained white solid powder ZIF-8 was ground and vacuum activated at 200°C for 2 hours to obtain a small amount of pure ZIF-8 with a size of 50 nm.

Embodiment 3

[0046] A ZIF-8-derived hollow Fe / Cu-N-C oxygen reduction catalyst, the specific preparation method is as follows:

[0047] Step 1. Preparation of precursor ZIF-8 material:

[0048] Weigh 0.84 g of zinc nitrate hexahydrate, dissolve it in 50 mL of methanol solution, and dissolve it completely by ultrasound to obtain a methanol solution of zinc nitrate hexahydrate; then take 1.61 g of 2-methylimidazole and dissolve in 50 mL of methanol solution In the process, ultrasound was used to completely dissolve it to obtain a methanol solution of 2-methylimidazole; the two solutions obtained above were mixed and stirred at room temperature for 24 hours to obtain a white precipitate. Centrifuge the white precipitate and add it to 100mL methanol solution, reflux at 80℃ for 12h, the obtained ZIF-8 methanol solution was centrifuged and washed with methanol three times, then dried under vacuum overnight at 60℃ to obtain white solid powder ZIF-8 . The obtained white solid powder ZIF-8 was ground ...

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Abstract

The invention discloses a ZIF-8-derived hollow Fe / Cu-N-C type oxygen reduction catalyst and a preparation method and application thereof. The preparation comprises (1) preparation of a precursor ZIF-8material; (2) preparation of a precursor Fe(OH)3-Cu(OH)2@ZIF-8 material of the catalyst; and (3) preparation of an oxygen reduction electrocatalyst of an iron / copper, nitrogen co-doped carbon material. The invention adopts ZIF-8 as a precursor, uses inexpensive CuCl2.2H2O and FeCl3.6H2O as metal sources, and adopts a high-temperature calcination method to prepare a Fe / Cu-N-C hollow structure catalyst having high catalytic activity for oxygen reduction reaction, which has comparable ORR performance in alkaline media to that of Pt-based catalysts, and has higher stability and methanol resistance. In addition, the invention has low raw material prices, rich sources and simple preparation processes, is conducive to large-scale production, and can be applied to fuel cells or metal air batteries.

Description

Technical field [0001] The invention belongs to the field of fuel cell catalysts, and relates to a non-noble metal and nitrogen co-doped carbon material oxygen reduction electrocatalyst, in particular to a ZIF-8 derived hollow Fe / Cu-NC type oxygen reduction catalyst, and a preparation method and application thereof , Mainly used in fuel cells related to the electrochemical reduction of oxygen. Background technique [0002] As environmental pollution problems continue to intensify and energy demand continues to expand, environmental and energy issues have become a hot spot in the world today. In order to solve the increasing contradiction between economic development, energy shortage and environmental pollution, it is particularly important to seek a clean, efficient, economical and sustainable new energy. Among them, fuel cells are considered to be the most important part of energy storage and conversion equipment due to their high energy efficiency and low emissions or even zer...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9083Y02E60/50
Inventor 诸海滨陈香兰
Owner SOUTHEAST UNIV
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