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Hollow-nanostructural Co2P@C composite material as well as preparation method and application thereof

A nanostructure and composite material technology, applied in the field of metal organic framework materials, nanomaterials, and nanocatalysis, can solve the problems that the OER performance of Co-based phosphides needs to be further improved.

Inactive Publication Date: 2019-07-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although some progress has been made, the OER performance of Co-based phosphides still needs to be further improved

Method used

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  • Hollow-nanostructural Co2P@C composite material as well as preparation method and application thereof
  • Hollow-nanostructural Co2P@C composite material as well as preparation method and application thereof
  • Hollow-nanostructural Co2P@C composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of precursor Co-BTC

[0028] (a) Cobalt nitrate hexahydrate Co(NO 3 ) 2 ·6H 2 O (0.72mmol, 0.21g) was dissolved in the mixed solvent of 30ml ethylene glycol and 20ml ethanol, stirred until forming a red transparent solution;

[0029] (b) Add 0.2g of polyvinylpyrrolidone PVP to the solution obtained in (a), and stir until completely dissolved;

[0030] (c) Trimellitic acid H 3 BTC (0.34mmol, 0.07g) was added to the solution obtained in (b), ultrasonicated for 10 minutes, stirred evenly, put into the reaction kettle, kept at 150°C for 24h, and then naturally cooled to room temperature;

[0031] (d) Collect the product by centrifugation, wash the product three times with ethanol, and then dry it in a vacuum oven at 60°C for 12 hours to obtain the precursor Co-BTC;

[0032] (2) Preparation of Co with hollow nanostructure 2 P@C composite materials:

[0033] The Co-BTC material prepared by 0.1g step (1) and 1g sodium hypophosphite NaH 2 PO 2 Put them in...

Embodiment 2

[0037] (1) Preparation of precursor Co-BTC

[0038] (a) Cobalt nitrate hexahydrate Co(NO 3 ) 2 ·6H 2 O (0.72mmol, 0.21g) was dissolved in the mixed solvent of 30ml ethylene glycol and 20ml ethanol, stirred until forming a red transparent solution;

[0039] (b) Add 0.2g of polyvinylpyrrolidone PVP to the solution obtained in (a), and stir until completely dissolved;

[0040] (c) Trimellitic acid H 3 BTC (0.34mmol, 0.07g) was added to the solution obtained in (b), ultrasonicated for 10 minutes, stirred evenly, put into the reaction kettle, kept at 150°C for 24h, and then naturally cooled to room temperature;

[0041] (d) Collect the product by centrifugation, wash the product three times with ethanol, and then dry it in a vacuum oven at 60°C for 12 hours to obtain the precursor Co-BTC;

[0042] (2) Preparation of Co with hollow nanostructure 2 P@C composite materials:

[0043] The Co-BTC material prepared by 0.1g step (1) and 1g sodium hypophosphite NaH 2 PO 2 Put them ...

Embodiment 3

[0046] (1) Preparation of precursor Co-BTC

[0047] (a) Cobalt nitrate hexahydrate Co(NO 3 ) 2 ·6H 2 O (0.72mmol, 0.21g) was dissolved in the mixed solvent of 30ml ethylene glycol and 20ml ethanol, stirred until forming a red transparent solution;

[0048] (b) Add 0.2g of polyvinylpyrrolidone PVP to the solution obtained in (a), and stir until completely dissolved;

[0049] (c) Trimellitic acid H 3 BTC (0.34mmol, 0.07g) was added to the solution obtained in (b), ultrasonicated for 10 minutes, stirred evenly, put into the reaction kettle, kept at 150°C for 24h, and then naturally cooled to room temperature;

[0050] (d) Collect the product by centrifugation, wash the product three times with ethanol, and then dry it in a vacuum oven at 60°C for 12 hours to obtain the precursor Co-BTC;

[0051] (2) Preparation of Co with hollow nanostructure 2 P@C composite materials:

[0052] The Co-BTC material prepared by 0.1g step (1) and 1g sodium hypophosphite NaH 2 PO 2 Put them ...

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Abstract

The invention discloses a preparation method of a hollow-nanostructural Co2P@C composite material obtained by direct phosphorization of a cobalt-based metal organic framework and used as a catalyst ofan oxygen evolution reaction, and belongs to the fields of nanocatalysis, nano materials and metal organic framework materials. The method comprises the following specific steps: 1) synthesizing a cobalt-containing metal organic framework precursor Co-BTC by using cobalt nitrate hexahydrate as a cobalt source and benzenetricarboxylic acid as an organic ligand; and 2) placing the precursor and sodium hypophosphite into a tube furnace, and performing direct heating to a corresponding temperature to prepare the hollow-nanostructural Co2P@C composite material. The raw materials used in the composite material provided by the invention have low costs, the preparation process is simple, and the composite material has excellent electrocatalytic performance in the oxygen evolution reaction; and inthe 1 mol / L KOH electrolyte, the overpotential is 330 mV when a current density is 10 mA / cm<2>, the corresponding Tafel slope is 44 mV / dec, and the catalytic performance can be maintained at 92.2% after the catalyst is used for the reaction for 6 h.

Description

technical field [0001] The invention belongs to the fields of nanocatalysis, nanomaterials and metal organic framework materials, and in particular relates to a Co 2 Preparation of P@C composites and its application in the field of electrocatalysis for oxygen evolution reaction Background technique [0002] Hydrogen, as a carbon-free energy source, is considered as a promising energy carrier to meet our needs for future fuel applications. At present, hydrogen is mainly produced from fossil resources through the steam reforming process, which also accelerates the consumption of fossil fuels and the emission of carbon dioxide greenhouse gas. To address the aforementioned existing energy and environmental issues, water electrolysis is an efficient and clean technology for generating high-purity hydrogen. Electrochemical water splitting mainly consists of two half-reactions: the hydrogen evolution reaction (HER) at the cathode and the oxygen evolution reaction (OER) at the ano...

Claims

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Application Information

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IPC IPC(8): B01J27/185B01J35/02C25B1/04C25B11/06
CPCB01J27/1853C25B1/04C25B11/04B01J35/33B01J35/40Y02E60/36
Inventor 刘毅朱伟伟赵蓉杨梦雅
Owner ZHEJIANG UNIV
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