Hollow carbon material doped with hollow cobalt phosphide nanoparticles in situ, preparation method and application of hollow carbon material in catalytic electrolysis of water for hydrogen production

A technology of in-situ doping and nanomaterials, applied in the field of catalytic electrolysis of water to produce hydrogen, can solve the problems of low catalytic activity, small specific surface area, complex manufacturing process, etc., and achieve simple reaction process, simple experimental operation, and good repeatability Effect

Active Publication Date: 2018-11-16
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although many emerging materials have some obvious advantages compared with noble metal materials, there are still some disadvantages in current hydrogen production electrode materials, such as complex manufacturing process, low catalytic activity, small specific surface area, etc.

Method used

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  • Hollow carbon material doped with hollow cobalt phosphide nanoparticles in situ, preparation method and application of hollow carbon material in catalytic electrolysis of water for hydrogen production
  • Hollow carbon material doped with hollow cobalt phosphide nanoparticles in situ, preparation method and application of hollow carbon material in catalytic electrolysis of water for hydrogen production
  • Hollow carbon material doped with hollow cobalt phosphide nanoparticles in situ, preparation method and application of hollow carbon material in catalytic electrolysis of water for hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation of metal-organic framework material ZIF-67 with dodecahedral morphology containing cobalt ions: 498 mg of Co(NO 3 ) 2 ·6H 2 O and 1400 mg of 2-methylimidazole were dissolved in 50 mL of methanol, and then the two solutions were mixed uniformly to obtain a purple solution, which was left at room temperature for 6 h. The product was purified by centrifugation (5000rpm, 10min), washed three times with methanol, and dried at 60°C for 12h. Finally, a metal-organic framework material ZIF-67 with a dodecahedral morphology was obtained, with a product quality of 400mg.

[0019] (2) Preparation of hollow polymer nanomaterials containing cobalt coordination doping: Weigh 760 mg of ZIF-6 prepared in step (1), and disperse it in 75 mL of methanol. After that, 56.9 mg of dopamine hydrochloride was weighed and dissolved in 15 mL of methanol to form a dopamine solution. The ZIF-67 dispersion was mixed with the dopamine solution, and the reaction system was stirred a...

Embodiment 2

[0024] (1) Preparation of metal-organic framework material ZIF-67 with dodecahedral morphology containing cobalt ions: 498mgCo(NO 3 ) 2 ·6H 2 O and 700mg of 2-methylimidazole were dissolved in 50mL of methanol respectively to obtain a purple clear solution, and then the solution was mixed uniformly and allowed to stand at room temperature for 24h. The product was purified by centrifugation (5000rpm, 10min), washed three times with methanol, and dried at 60°C for 12h. Finally, a metal-organic framework material ZIF-67 with a dodecahedral morphology was obtained, with a product quality of 100mg.

[0025](2) Preparation of hollow polymer nanomaterials containing cobalt coordination doping: Weigh 760 mg of ZIF-6 prepared in step (1), and disperse it in 75 mL of methanol. After that, 56.9 mg of dopamine hydrochloride was weighed and dissolved in 15 mL of methanol to form a dopamine solution. The ZIF-67 dispersion was mixed with the dopamine solution, and the reaction system was ...

Embodiment 3

[0030] (1) Preparation of electrocatalytic working electrode: Dissolve 10 mg of the hollow cobalt phosphide / carbon composite hollow nanomaterial prepared in Example 1 in a mixed solvent of 900 μL methanol and 100 μL, 2 wt % perfluorosulfonic acid resin, and ultrasonically Treat for 30 minutes to make it a uniform dispersion. Afterwards, 10 μL of the dispersed liquid was dropped on the glassy carbon electrode and dried at room temperature.

[0031] (2) Linear voltammetry test: the voltage range of the linear voltammetry test is 0-0.6V, the scanning speed is 10mV per second, and the electrolyte used is 0.5M sulfuric acid solution.

[0032] (3) Catalytic stability test: First, through cyclic voltammetry scanning, the test voltage range is 0-0.6V, the scanning speed is 100mV per second, and the number of scanning cycles is 1000. Then carry out the linear voltammetry sweep test in step (2), and compare the result with the result in step (2).

[0033] (4) Electrochemical AC impeda...

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Abstract

The invention discloses a preparation method of a hollow carbon material which has dodecahedron morphology and is doped with hollow cobalt phosphide nanoparticles in situ and an application of the hollow carbon material in catalytic electrolysis of water for hydrogen production, and belongs to the technical field of catalytic electrolysis of water for hydrogen production. The method comprises specific steps as follows: (1) preparation of a metal organic framework material ZIF-67 containing cobalt ions and having dodecahedral morphology; (2) the cobalt-containing metal organic framework material ZIF-67 and a dopamine monomer are subjected to reaction, and a cobalt coordination doped hollow polymer nano-material is generated; (3) a cobalt oxide/carbon composite hollow nano-material is prepared; (4) a hollow cobalt phosphide/carbon composite hollow nanomaterial is prepared. The size of the material can be adjusted according to size of ZIF-67; in performance tests of water for hydrogen production in catalytic electrolysis, the electrode material used as a cathode shows very good electrocatalytic activity and stability. Therefore, the material has very good application prospect as the electrode material for catalyzing electrolysis of water for hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by catalytic electrolysis of water, and specifically relates to a hollow carbon material with dodecahedral morphology doped with hollow cobalt phosphide nanoparticles in situ, a preparation method and its application in hydrogen production by catalytic electrolysis of water. Background technique [0002] Due to the global energy crisis and related environmental problems, researchers are trying to find renewable energy that can replace fossil fuels, and electrolysis of water to produce hydrogen is a very promising way. Due to the advantages of high energy conversion efficiency, almost no pollution, and broad application prospects, hydrogen production by electrolysis of water has attracted extensive attention of researchers on electrode materials. At present, platinum group metals have the highest hydrogen production activity, but the disadvantages of high cost and low output limit their...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185C25B1/04C25B11/06
CPCB01J27/1853B01J35/0033C25B1/04C25B11/095Y02E60/36
Inventor 张恺陈一新
Owner JILIN UNIV
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