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Preparation method and application of FeSn compound coated NC electrocatalyst

A technology of electrocatalysts and compounds, applied in fuel cell half-cells and secondary battery-type half-cells, circuits, electrical components, etc., can solve the problems of easy poisoning, high price, poor stability, etc., and achieve ORR performance Excellent, large specific surface area, good stability

Pending Publication Date: 2022-05-10
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the noble metal Pt-based catalyst is the most effective ORR catalyst, but its high price, poor stability, and easy to be poisoned, etc., these characteristics largely limit its large-scale application

Method used

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  • Preparation method and application of FeSn compound coated NC electrocatalyst
  • Preparation method and application of FeSn compound coated NC electrocatalyst
  • Preparation method and application of FeSn compound coated NC electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 7.88 g 2-methylimidazole and 7 g Zn(NO 3 ) 2 ∙6H 2 O was dissolved in 400 mL of methanol, after stirring at room temperature for 30 min, at 60 o After standing at C for 24 h, the obtained product was washed with methanol, centrifuged, and vacuum-dried for 12 h to obtain ZIF-8. Subsequently, 0.61 g Fe(NO 3 ) 3 ∙9H 2 O and 0.36 g (CH 3 COO) 2 Sn was dissolved in methanol in turn, and ZIF-8 was added to soak and stir for 4 h, then centrifuged and washed with methanol, and dried in vacuum for 12 h. Finally, the obtained powder was ground evenly, and placed in the center of the tube furnace, in a high-purity Ar atmosphere at a heating rate of 5 o C / min heating up to 900 o C, High temperature pyrolysis for 2 h to obtain FeSn compound@NC electrocatalyst, labeled as FeSn compound@NC-1.

[0022] figure 1 The FeSn compound @NC-1 in a is the XRD pattern of the catalyst prepared in this example. As shown in the figure, the broad diffraction peak at about 26° corresponds ...

Embodiment 2

[0024] 7.88 g 2-methylimidazole and 7 g Zn(NO 3 ) 2 ∙6H 2 O was dissolved in 400 mL of methanol, stirred at room temperature for 30 min, and then allowed to stand at 60 °C for 24 h, then the obtained product was washed with methanol, centrifuged, and vacuum-dried for 12 h to obtain ZIF-8. Subsequently, 0.61 g Fe(NO 3 ) 3 ∙9H 2 O and 0.12 g (CH 3 COO) 2 Sn was dissolved in methanol in turn, and ZIF-8 was added to soak and stir for 4 h, then centrifuged and washed with methanol, and dried in vacuum for 12 h. Finally, the obtained powder was ground evenly, and placed in the center of the tube furnace, in a high-purity Ar atmosphere at a heating rate of 5 o C / min heating up to 900 o C, High temperature pyrolysis for 2 h to obtain FeSn compound@NC electrocatalyst, labeled as FeSn compound@NC-2.

[0025] figure 1 The FeSn compound @NC-2 in b is the XRD pattern of the catalyst prepared in this example. Same as Example 1, the broad diffraction peak at around 26° corresponds...

Embodiment 3

[0027] 7.88 g 2-methylimidazole and 7 g Zn(NO 3 ) 2 ∙6H 2 O was dissolved in 400 mL of methanol, stirred at room temperature for 30 min, and then allowed to stand at 60 °C for 24 h, then the obtained product was washed with methanol, centrifuged, and vacuum-dried for 12 h to obtain ZIF-8. Subsequently, 0.61 g Fe(NO 3 ) 3 ∙9H 2 O and 0.12 g (CH 3 COO) 2 Sn was dissolved in methanol in turn, and ZIF-8 was added to soak and stir for 4 h, then centrifuged and washed with methanol, and dried in vacuum for 12 h. Finally, the obtained powder was ground evenly, placed in the center of a tube furnace, heated to 1000 °C in a high-purity Ar atmosphere at a heating rate of 5 °C / min, and pyrolyzed at a high temperature for 2 h to obtain the FeSn compound@NC electrocatalyst, marked is the FeSn compound @NC-3.

[0028] figure 1 The FeSn compound @NC-3 in c is the XRD pattern of the catalyst prepared in this example. It is the same as Example 1 and 2, with a wider diffraction peak at...

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Abstract

The invention provides a preparation method and application of a FeSn compound coated NC electrocatalyst. The preparation method comprises the following steps: adding a ZIF-8 precursor into a methanol solution of ferric nitrate nonahydrate and tin acetate, soaking and stirring, centrifugally washing with methanol, drying in a vacuum drying oven, uniformly grinding the obtained powder in a mortar, placing in the center of a tubular furnace, and performing high-temperature pyrolysis in an inert atmosphere to obtain the FeSn compound-coated NC electrocatalyst. The catalyst has the advantages of larger specific surface area, excellent ORR catalytic activity and stability and the like, and has potential application in the field of oxygen reduction reaction.

Description

technical field [0001] The invention relates to a class of high-efficiency and cheap ORR electrocatalysts, in particular to a preparation method and oxygen reduction performance of a FeSn compound@NC electrocatalyst, and belongs to the field of oxygen reduction applications. Background technique [0002] Great efforts have been made in the development of green and sustainable energy, and the advancement of electrochemical energy storage conversion technologies (such as fuel cells, metal-air batteries, etc.) has been greatly promoted. Among them, zinc-air batteries have attracted much attention due to their high energy density, good safety, low cost, and environmental protection, and are expected to be widely used in the field of energy conversion and storage. The air cathode oxygen electrocatalysis kinetics of zinc-air batteries is slow, which is the main reason for its limited performance. Therefore, it is necessary to develop efficient oxygen electrocatalysts to accelerate...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/08
CPCH01M4/9041H01M4/9083H01M12/08
Inventor 孙盼盼谢幸龚涛张丹孙小华
Owner CHINA THREE GORGES UNIV
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