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Zinc-containing monatomic catalyst as well as preparation method and application thereof

A catalyst and atomic technology, applied in the field of electrocatalysis, can solve the problems of low stability of zinc single-atom catalysts, complex and difficult to control the preparation process, unfriendly environment, etc., achieve good anti-poisoning ability, simple and controllable process, prevent zinc The effect of atomic agglomeration

Active Publication Date: 2020-08-25
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a zinc-containing single-atom catalyst and its preparation method and application, aiming to solve the complex and difficult-to-control preparation process of the existing zinc single-atom catalyst, high energy consumption, and post-treatment problems. Unfriendly to the environment or the stability of the obtained zinc single-atom catalyst is not high

Method used

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  • Zinc-containing monatomic catalyst as well as preparation method and application thereof
  • Zinc-containing monatomic catalyst as well as preparation method and application thereof
  • Zinc-containing monatomic catalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Embodiment 1 pure zinc single-atom catalyst: C-ZIF8-NH 3 Preparation of -800

[0045] (1) 2-methylimidazole zinc salt (structure is: Named ZIF8) was calcined in a high-temperature tube furnace. Under a mixed atmosphere of hydrogen and nitrogen, the temperature was raised to 120°C at 2°C / min, and kept for 2h; then the temperature was raised to 300°C at 2°C / min, kept for 2h, and finally The temperature was raised to 600°C at 5°C / min, held for 3 hours, and cooled naturally to room temperature to obtain the zinc intermediate as a gray-black powder sample, which was named H-ZIF8.

[0046] (2) Add H-ZIF8 (0.1 g) to 10 mL of ammonia water with a concentration of 28 wt%, stir for 24 hours, collect by filtration, and obtain the first zinc-containing solid, which is a black sample, named C-ZIF8-NH 3 .

[0047] (3) Under the protection of nitrogen, the C-ZIF8-NH 3 Put it in a high-temperature tube furnace, raise the temperature to 120°C at 2°C / min, and keep it for 2h; then ra...

Embodiment 2

[0051] Embodiment 2 pure zinc single-atom catalyst: preparation of C-ZIF8-NaOH-800

[0052] The preparation steps are the same as in Example 1, except that 10 mL of aqueous NaOH solution with a concentration of 28 wt % is used to replace 10 mL of aqueous ammonia with a concentration of 28 wt %.

Embodiment 3

[0053] Embodiment 3 pure zinc single-atom catalyst: C-ZIF8-H 2 SO 4 Preparation of -800

[0054] The preparation steps are the same as in Example 1, except that: 10 mL of 28 wt% H 2 SO 4 The aqueous solution replaced 10 mL of aqueous ammonia with a concentration of 28 wt%.

[0055] For the H-ZIF8 in the preparation process of Example 1, and the C-ZIF8-NH respectively prepared in Examples 1-3 3 -800, C-ZIF8-NaOH-800 and C-ZIF8-H 2 SO 4 -800 for X-ray diffraction (XRD) test, their test results are compared as Figure 8 shown. It can be seen that H-ZIF8 contains ZnO; after acid or alkali etching, ZnO (corresponding to the diffraction peak of PDF: 36-1451) completely disappears, and only the diffraction peak of amorphous carbon material; indicating that after etching, the Zn compound is highly dispersed, Therefore, the Zn in the final zinc-containing single-atom catalyst is highly dispersed.

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Abstract

The invention discloses a zinc-containing monatomic catalyst as well as a preparation method and application thereof. According to the invention, 2-methylimidazole zinc salt (ZIF8) is used as a zinc precursor, a zinc intermediate is obtained through low-temperature calcination, then the low-zinc intermediate is etched (and loaded), and finally, high-temperature calcination is performed to preparethe zinc-containing monatomic catalyst. The method has the advantages that the process is simple and controllable, the zinc content does not need to be strictly controlled, and carrier materials do not need to be adopted; zinc atom agglomeration can be effectively prevented through low-temperature calcination and etching before high-temperature calcination; the obtained pure zinc monatomic catalyst is good in catalytic activity, high in stability and relatively good in poisoning resistance; and the obtained supported zinc-containing monatomic catalyst can further improve the catalytic activityof a pure zinc monatomic catalyst or meet the requirements of different catalytic systems.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to a zinc-containing single-atom catalyst and its preparation method and application. Background technique [0002] Zinc-air batteries and fuel cells with high energy density and high efficiency are very promising energy storage devices in the future. As long as there is a suitable cathode oxygen reduction catalyst, zinc-air batteries and fuel cells will play an important role in the field of energy storage and conversion in the future. Location. As a special supported non-precious metal catalyst, single-atom catalyst refers to that all metal components on the support exist in the form of single-atom dispersion, and its catalytic active sites are exposed to the maximum. When the particle dispersion reaches single-atom When the size is small, it will cause more new characteristics relative to nanoscale materials, such as sharply increased surface free energy, quantum size e...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/86H01M4/90H01M12/06
CPCH01M4/8652H01M4/8882H01M4/9008H01M12/06
Inventor 范梁栋徐括峰
Owner SHENZHEN UNIV
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