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Preparation method of cobalt phosphide nanoparticles

A nanoparticle and cobalt phosphide technology, which is applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of reducing mass transfer efficiency, weak conductivity, and affecting catalyst activity, and achieve accelerated reaction, reduced covering, excellent activity and The effect of stability

Inactive Publication Date: 2021-06-08
徐志军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a preparation method of cobalt phosphide nanoparticles, which solves the problem that the relatively weak conductive adhesive may block the active sites and reduce the mass transfer efficiency, thereby affecting the activity of the catalyst.

Method used

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  • Preparation method of cobalt phosphide nanoparticles
  • Preparation method of cobalt phosphide nanoparticles
  • Preparation method of cobalt phosphide nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] S1. Add 6.3g of cobalt chloride hexahydrate and 1g of polyvinylpyrrolidone into 8ml of N,N-dimethylformamide, heat and stir at 80°C until dissolved to obtain a viscous solution;

[0025] S2, then soak the 1cm×1cm carbon cloth into the viscous solution in step S1, and then dry the carbon cloth with the cobalt precursor attached at 80°C;

[0026] S3, then put it in a tube furnace with a protective gas atmosphere to raise the temperature to 600°C at a rate of 10°C / min and continue to maintain it for 2h to obtain elemental cobalt nanoparticles (CoNPs / CC) uniformly grown on the surface of the carbon cloth;

[0027] S4. Subsequently, CoNPs / CC and sodium hypophosphite were placed in a tube furnace with a protective gas atmosphere to raise the temperature to 300°C at a rate of 2°C / min and continue to maintain for 2h;

[0028] S5. Finally, cobalt phosphide nanoparticles (CoP NPS / CC) were obtained after the tube furnace cooled naturally.

Embodiment 2

[0030] S1. Add 4g of cobalt chloride hexahydrate and 0.5g of polyvinylpyrrolidone into 5ml of N,N-dimethylformamide, heat and stir at 80°C until dissolved to obtain a viscous solution;

[0031] S2, then soak the 1cm×1cm carbon cloth into the viscous solution in step S1, and then dry the carbon cloth with the cobalt precursor attached at 80°C;

[0032] S3, then put it in a tube furnace with a protective gas atmosphere to raise the temperature to 600°C at a rate of 10°C / min and continue to maintain it for 2h to obtain elemental cobalt nanoparticles (CoNPs / CC) uniformly grown on the surface of the carbon cloth;

[0033] S4. Subsequently, CoNPs / CC and sodium hypophosphite were placed in a tube furnace with a protective gas atmosphere to raise the temperature to 300°C at a rate of 2°C / min and continue to maintain for 2h;

[0034] S5. Finally, cobalt phosphide nanoparticles (CoP NPS / CC) were obtained after the tube furnace cooled naturally.

Embodiment 3

[0036] S1. Add 2.4g of cobalt chloride hexahydrate and 0.2g of polyvinylpyrrolidone into 4ml of N,N-dimethylformamide, heat and stir at 80°C until dissolved to obtain a viscous solution;

[0037] S2, then soak the 1cm×1cm carbon cloth into the viscous solution in step S1, and then dry the carbon cloth with the cobalt precursor attached at 80°C;

[0038] S3, then put it in a tube furnace with a protective gas atmosphere to raise the temperature to 600°C at a rate of 10°C / min and continue to maintain it for 2h to obtain elemental cobalt nanoparticles (CoNPs / CC) uniformly grown on the surface of the carbon cloth;

[0039] S4. Subsequently, CoNPs / CC and sodium hypophosphite were placed in a tube furnace with a protective gas atmosphere to raise the temperature to 300°C at a rate of 2°C / min and continue to maintain for 2h;

[0040] S5. Finally, cobalt phosphide nanoparticles (CoP NPS / CC) were obtained after the tube furnace cooled naturally.

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Abstract

The invention discloses a preparation method of cobalt phosphide nanoparticles, which comprises the following steps of by taking sodium hypophosphite as a phosphorus source through a low-temperature phosphorization method at 300 DEG C, successfully converting elemental cobalt nanoparticles tightly growing on carbon cloth into cobalt phosphide nanoparticles (CoPNPS / CC) through a film. The CoPNPS / CC shows excellent activity and stability of catalytic hydrogen evolution. CoP particles are tightly connected together, and CoP and carbon cloth fibers are tightly connected together, so that mutual transmission of electrons is facilitated, and the decomposition efficiency of water is accelerated. Besides, the flexibility of the carbon cloth enables the CoPNPS / CC to tightly grow on the surface of the carbon cloth to form a uniform nanoparticle film, and the conductivity of the carbon cloth is beneficial to free flow of electrons between the CoPNPS / CC so as to accelerate the reaction; the three-dimensional structure of the carbon cloth is beneficial to rapid precipitation of generated hydrogen, and covering of bubbles accumulated on the surface of the catalyst on active sites is reduced.

Description

technical field [0001] The invention relates to the technical field of hydrogen evolution catalyst preparation, in particular to a preparation method of cobalt phosphide nanoparticles. Background technique [0002] Electrolysis of water is one of the simplest methods for large-scale production of high-purity hydrogen, and the use of electrocatalysts can significantly reduce the additional energy consumed by electrolysis of water. Water electrolysis devices based on proton exchange membrane technology need to operate in strongly acidic electrolytes, so it is necessary to develop hydrogen evolution catalysts that can exist stably in acidic electrolytes. At present, platinum-group nanomaterials are still the catalysts with the highest catalytic performance in acidic electrolytes, but their scarcity and high price severely restrict their application in electrolysis of water for hydrogen evolution. Therefore, the development of high-efficiency and low-cost catalysts can effectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/075C25B1/04
CPCC25B1/04Y02E60/36
Inventor 徐志军
Owner 徐志军
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