Preparation method of ZIF-8-derived N,S-co-doped non-metallic carbon-based nano-oxygen reduction electrocatalyst

A ZIF-8, carbon-based nanotechnology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, to achieve the effect of improving electrical conductivity, low cost, and good long-term stability

Active Publication Date: 2019-10-18
SOUTHEAST UNIV
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Problems solved by technology

Although a series of progress has been made in the preparation of heteroatom-doped non-metallic carbon materials using ZIF-8 as a carbon source and template, but using ZIF-8 as a precursor, 4-(...

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  • Preparation method of ZIF-8-derived N,S-co-doped non-metallic carbon-based nano-oxygen reduction electrocatalyst
  • Preparation method of ZIF-8-derived N,S-co-doped non-metallic carbon-based nano-oxygen reduction electrocatalyst
  • Preparation method of ZIF-8-derived N,S-co-doped non-metallic carbon-based nano-oxygen reduction electrocatalyst

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preparation example Construction

[0030] Its preparation method specifically comprises the following steps:

[0031] 1.1. Preparation of ZIF-8:

[0032] Weigh 1.68g of zinc nitrate hexahydrate solid, dissolve it in 80mL of methanol solution, and ultrasonically dissolve it completely to obtain zinc nitrate hexahydrate solution, and weigh 3.7g of 2-methylimidazole solid, dissolve it in 80mL of methanol In the solution, ultrasound was used to completely dissolve it to obtain a zinc nitrate hexahydrate solution and a 2-methylimidazole solution. The above two solutions were mixed and stirred, and reacted at room temperature for 24 hours to obtain a ZIF-8 solution; the obtained ZIF-8 The solution is centrifuged in a centrifuge to obtain a ZIF-8 solid containing methanol, zinc nitrate, and 2-methylimidazole; the obtained ZIF-8 solid containing methanol, zinc nitrate, and 2-methylimidazole is washed with methanol under ultrasonic 3-5 times, vacuum-dried at 60°C for 12 hours to obtain a ZIF-8 solid containing 2-methyl...

specific Embodiment 1

[0045] 1.1. Preparation of ZIF-8:

[0046] Weigh 1.68g of zinc nitrate hexahydrate solid, dissolve it in 80mL of methanol solution, and ultrasonically dissolve it completely to obtain zinc nitrate hexahydrate solution, and weigh 3.7g of 2-methylimidazole solid, dissolve it in 80mL of methanol In the solution, ultrasound was used to completely dissolve it to obtain a zinc nitrate hexahydrate solution and a 2-methylimidazole solution. The above two solutions were mixed and stirred, and reacted at room temperature for 24 hours to obtain a ZIF-8 solution; the obtained ZIF-8 The solution is centrifuged in a centrifuge to obtain a ZIF-8 solid containing methanol, zinc nitrate, and 2-methylimidazole; the obtained ZIF-8 solid containing methanol, zinc nitrate, and 2-methylimidazole is washed with methanol under ultrasonic 3-5 times, vacuum-dried at 60°C for 12 hours to obtain a ZIF-8 solid containing 2-methylimidazole; dissolve the above-mentioned ZIF-8 solid containing 2-methylimidaz...

specific Embodiment 2

[0052] 2.1. Preparation of ZIF-8:

[0053] Prepared according to the method and conditions of step 1.1 in Example 1;

[0054] 2.2. Preparation of catalyst precursor:

[0055] Weigh 400 mg of the above ZIF-8, 170 mg of 4-(2-thienyl) pyrimidine-2-thiol, and 87 mg of triethylamine, and add the above-mentioned substances to a mixture of 200 mL of methanol and dichloromethane (V:V=1:1). In the mixed solution, stir for 24 h, centrifuge, wash with methanol three times, and dry in vacuum; obtain the ZIF-8 catalyst precursor material containing heteroatom small molecules;

[0056] 2.3. Preparation of N, S-co-doped non-metallic carbon-based nanocatalysts:

[0057] Prepared according to the method and conditions of step 1.3 in Example 1.

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Abstract

The invention discloses a preparation method of a ZIF-8-derived N,S-co-doped non-metallic carbon-based nano-oxygen reduction electrocatalyst. According to the preparation method disclosed by the invention, a uniform ZIF-8 precursor is synthesized by controlling synthesis conditions of crystals; then ZIF-8 is mixed with sulfur-containing small molecules through a solvent to form a uniformly dispersed mixed material; and finally high-temperature carbonization is performed in a tubular furnace to obtain a black powder carbon material, and without further post-treatment, ZIF-8-derived N,S-co-dopednon-metallic carbon-based nano-oxygen reduction electrocatalyst is obtained. Due to the uniform size of ZIF-8 and the volatility of Zn, a uniform thin-layer shell-like graphite carbon material is formed. The electrocatalyst has the structural characteristics of large specific surface area and S and N co-doping; and in the carbonization process, a part of Zn and S form semiconductor ZnS crystals with relatively high conductivity, so that the material has relatively high electrocatalytic performance.

Description

technical field [0001] The invention relates to a simple, low-cost and highly efficient N, S-co-doped non-metallic carbon-based nanometer oxygen reduction catalyst, and mainly relates to the fields of material photochemistry, electrochemistry, fuel cell, oxygen reduction catalysis and the like. Background technique [0002] With the development of science and technology, mobile devices such as mobile phones and notebooks have become indispensable tools in people's lives. Battery life has always been an important issue restricting the development of mobile devices, so the preparation of efficient energy conversion devices has attracted widespread attention. Fuel cells are green and efficient energy utilization devices, but the anode materials usually use expensive rare metal Pt, which restricts the wide application of fuel cells. In addition, Pt also has problems such as easy poisoning and poor long-term stability. Therefore, finding a new electrode catalyst substitute is t...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88B82Y30/00
CPCH01M4/9083H01M4/90H01M4/8825B82Y30/00Y02E60/50
Inventor 诸海滨孙志远
Owner SOUTHEAST UNIV
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