Nonmetallic bifunctional oxygen catalyst based on ZIF-8 and double-doped with phosphorus and sulfur, and preparation method and application thereof

A technology of ZIF-8 and oxygen catalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., to achieve good catalytic activity, good methanol tolerance, and convenient The effect of mass production

Pending Publication Date: 2018-12-18
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some achievements have been made in the preparation of porous carbon nanomaterials with ZIF as the precursor, there is no P-doped non-metallic carbon pore prepared

Method used

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  • Nonmetallic bifunctional oxygen catalyst based on ZIF-8 and double-doped with phosphorus and sulfur, and preparation method and application thereof
  • Nonmetallic bifunctional oxygen catalyst based on ZIF-8 and double-doped with phosphorus and sulfur, and preparation method and application thereof
  • Nonmetallic bifunctional oxygen catalyst based on ZIF-8 and double-doped with phosphorus and sulfur, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (a) Preparation of ZIF-8

[0030] 0.29g Zn(NO 3 )·6H 2 O and 0.66g of 2-methylimidazole were respectively dissolved in 15mL of methanol, and the temperature was kept between 30 and 35°C. Under stirring conditions, the methanol solution of 2-methylimidazole was slowly added dropwise to the methanol solution of zinc nitrate, After continuing to stir for 15 minutes, age at the same temperature for 24 hours, collect the white precipitate by centrifugation, wash with methanol for 3 times, and finally dry it in a vacuum oven at 50°C for 12 hours;

[0031] (b) Preparation of PSpC metal-free bifunctional oxygen catalyst

[0032] Grind ZIF-8 obtained in step (a) into powder, take 0.5g and disperse it in 10mL of methanol, weigh 0.2g of sodium phytate and 0.12g of dodecanethiol and dissolve them in 15mL of dehydrated ethanol respectively. Slowly add the ethanol dispersion of sodium phytate to the ZIF-8 dispersion, stir for 2 hours and then let it stand for 24 hours; then add th...

Embodiment 2

[0034] (a) Preparation of ZIF-8

[0035] 0.29g Zn(NO 3 )·6H 2O and 0.66g 2-methylimidazole were respectively dissolved in 15mL of methanol, and the temperature was kept at 25°C. Slowly add the methanol solution of 2-methylimidazole into the methanol solution of zinc nitrate under stirring condition, and continue to stir for 15min. , aged at the same temperature for 24 hours, centrifuged to collect the white precipitate, washed with methanol for 3 times, and finally dried in a vacuum oven at 50°C for 12 hours;

[0036] (b) Preparation of PSpC metal-free bifunctional oxygen catalyst

[0037] Prepare according to the method and condition of step (b) in embodiment 1, the specific surface area of ​​gained PSpC catalyst is 1514.6m 2 / g.

Embodiment 3

[0039] (a) Preparation of ZIF-8

[0040] 0.29g Zn(NO 3 )·6H 2 O and 0.66g of 2-methylimidazole were respectively dissolved in 15mL of methanol, and the temperature was kept between 25 and 35°C. Under stirring conditions, the methanol solution of 2-methylimidazole was quickly poured into the methanol solution of zinc nitrate, and continued After stirring for 15 minutes, aging at the same temperature for 24 hours, centrifuging to collect the white precipitate, washing with methanol for 3 times, and finally drying in a vacuum oven at 50°C for 12 hours;

[0041] (b) Preparation of PSpC metal-free bifunctional oxygen catalyst

[0042] According to the method and condition preparation of step (b) in embodiment 1, the specific surface area of ​​gained PSpC catalyst is 1594.8m 2 / g. .

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Abstract

The invention discloses a nonmetallic bifunctional oxygen catalyst based on ZIF-8 and double-doped with phosphorus and sulfur, and a preparation method and an application thereof. A nonmetal carbon porous nano-compound is prepared through calcination in an inert atmosphere with ZIF-8 as a template, sodium phytate as a phosphorus source and 1-dodecanethiol as a sulfur source, the porous skeleton structure of ZIF makes the carbon material obtained after calcination inherit the porous structure, and metal Zn is sublimated and removed due to the low boiling point, so the carbon material uniformlyco-doped with phosphorus and sulfur is obtained. The obtained catalyst has a high specific surface area and a high conductivity, and has good oxygen reduction and oxygen evolution electrocatalytic activity in an alkaline medium, because the porous carbon material catalyst effectively increases the specific surface area and the conductivity; and the phosphorus and sulfur partially replace C-C sp<2>hybrid orbital to form C-P and C-S links, so active sites are increased, the conduction of electrons is benefited, the electrocatalytic performance of the material is greatly improved, and the material has potential application values in the field of energy conversion and storage.

Description

Technical field: [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and specifically relates to a non-metallic bifunctional oxygen catalyst based on ZIF-8 phosphorus-sulfur double doping; it also relates to a preparation method of the catalyst and its application in alkaline fuel cell cathode oxygen reduction Reactions and electrocatalytic applications in anodic oxygen evolution reactions for electrolysis of water. Background technique: [0002] Energy technologies such as fuel cells and metal-air batteries have attracted widespread attention for their high-efficiency energy conversion and environmental friendliness. Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are key electrode processes used in various sustainable energy technologies, but both processes suffer from slow kinetics, and current catalysts for ORR reactions are mainly Pt and its alloys, the catalyst for OER reaction is mainly IrO 2...

Claims

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Application Information

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IPC IPC(8): B01J31/24B01J35/10C25B1/04C25B11/04H01M4/90
CPCB01J31/24B01J35/0033B01J35/1028C25B1/04C25B11/04H01M4/9008Y02E60/36Y02E60/50
Inventor 詹天荣张鹏荣皓庆温永红张晓
Owner QINGDAO UNIV OF SCI & TECH
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