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Heteroatom-doped carbon-coated metal bifunctional water decomposition nano material and preparation method thereof

A nanomaterial and carbon coating technology, applied in the field of nanomaterials, can solve the problems of lack of fine structure, effectively control the poor properties of bifunctional water splitting, etc., and achieve the effect of being convenient for popularization and application, conducive to large-scale production, and good conductivity.

Inactive Publication Date: 2020-10-09
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a heteroatom-doped carbon-coated metal bifunctional decomposition method for the lack of effective control of the fine structure of heteroatom-doped carbon-coated metal nanomaterials and the poor performance of bifunctional water splitting. Water nanomaterial and preparation method thereof

Method used

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  • Heteroatom-doped carbon-coated metal bifunctional water decomposition nano material and preparation method thereof
  • Heteroatom-doped carbon-coated metal bifunctional water decomposition nano material and preparation method thereof
  • Heteroatom-doped carbon-coated metal bifunctional water decomposition nano material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] A method for preparing heteroatom-doped carbon-coated metal bifunctional water-splitting nanomaterials, the specific steps are as follows:

[0031] (a) Cu(OH) 2 Precursor preparation

[0032] Dissolve 180 mg CuCl2 and 200 mg ethylene glycol into 200 mL deionized water, and after stirring evenly, add 1.2 mL 6 M NaOH solution dropwise into the solution, and then stir for 30 min. After the reaction was completed, a blue precipitate was obtained by centrifugation, and then washed and centrifuged repeatedly with deionized water and ethanol solution for 5 times, and finally Cu(OH)2 nanowires were obtained.

[0033] (b) Cu(OH) 2 / Preparation of metal-organic framework composites

[0034] 30 mg of Cu(OH)2 nanowires obtained in step (a), 1 mmol Co(NO 3 ) 2 And 200 mg of polyvinylpyrrolidone was dissolved in 25 mL of methanol solution and ultrasonicated for 10 min to obtain dispersion I. Then weigh 800 mg of 2-methylimidazole and dissolve it in 25 mL of methanol solution, ...

Embodiment 2

[0040] A preparation method of a heteroatom-doped carbon-coated metal bifunctional water-splitting nanomaterial, the same as in Example 1, wherein:

[0041]In step (a), the mass ratio of CuCl2 to ethylene glycol is 1:1, and the volume ratio of the metal salt solution to alkali solution is 1:1; in step (b), the metal precursor and Co(NO 3 ) 2 The mass ratio of the metal salt and dimethylimidazole is 1:0.5, and the mass ratio of the metal salt to dimethylimidazole is 1:1; in step (c), the heating rate is 0.5 °C / min, the heat treatment temperature is 600 °C, and the heat treatment time is 0.1 h. The nitrogen-doped carbon-coated copper-cobalt nanomaterials prepared in this example obtained 10 mA cm -2 The overpotential of the current density is 298 mV; in the reaction of splitting water to produce oxygen, 10 mA cm -2 The overpotential of the current density was 460 mV.

Embodiment 3

[0043] A preparation method of a heteroatom-doped carbon-coated metal bifunctional water-splitting nanomaterial, the same as in Example 1, wherein:

[0044] In step (a), the mass ratio of CuCl2 to ethylene glycol is 1:10, and the volume ratio of the metal salt solution to the alkali solution is 1:10; in the step (b), the metal precursor and Co(NO 3 ) 2 The mass ratio of the metal salt to dimethylimidazole is 1:10, and the mass ratio of the metal salt to dimethylimidazole is 1:10; in step (c), the heating rate is 50 °C / min, the heat treatment temperature is 1000 °C, and the heat treatment time is 5 h. The nitrogen-doped carbon-coated copper-cobalt nanomaterials prepared in this example obtained 10 mA cm -2 The overpotential of the current density is 221 mV; in the water splitting oxygen reaction, 10 mA cm -2 The overpotential of the current density was 412 mV.

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Abstract

The invention belongs to the technical field of nano materials, and particularly relates to a heteroatom-doped carbon-coated metal bifunctional water decomposition nano material and a preparation method thereof. The method comprises the following steps: preparing a metal precursor nano material through a coprecipitation method; then growing a metal organic framework on the surface of the metal precursor nano material; and finally, preparing the heteroatom-doped carbon-coated metal bifunctional water decomposition nano material through confinement thermal conversion. The diffusion process of metal ions in the high-temperature heat treatment process is limited by utilizing the high specific surface area and pore structure of the metal organic framework so that the metal ions are uniformly distributed in the heteroatom-doped carbon material; more metal-heteroatom compound bonds are formed in the heat treatment process, and the doping content of heteroatoms in the carbon material is increased. The prepared material is regular and ordered in structure, good in dispersity, large in specific surface area, excellent in conductivity, good in mechanical and chemical stability, simple in process, low in cost, safe, reliable and convenient for large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a heteroatom-doped carbon-coated metal bifunctional water-decomposing nanometer material and a preparation method thereof. Background technique [0002] Heteroatom-doped carbon-coated metal nanomaterials, due to the strong synergistic effect between metal and doped carbon, can greatly improve the electrical properties of materials, and have attracted widespread attention. [0003] The existing preparation methods of heteroatom-doped carbon-coated metal nanomaterials mainly include: ① simple mechanical mixing, usually the existing metal particles and heteroatom-doped carbon materials are mechanically mixed by simple ultrasound or stirring. The disadvantages are: poor uniformity, easy agglomeration, small synergistic effect, etc. ② In-situ sintering, usually by uniformly mixing metal salts and carbon-containing precursors first, and then sintering at high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C25B1/04C25B11/06
CPCB01J27/24C25B1/04C25B11/04B01J35/33Y02E60/36
Inventor 郑耿锋况敏
Owner FUDAN UNIV