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Ultrafine nitrogen-doped molybdenum carbide nanoparticle loaded on three-dimensional nitrogen-doped flower-shaped carbon spheres, as well as preparation method and application thereof

A nanoparticle and nitrogen-doped technology, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of high Mo-H bond, unfavorable hydrogen precipitation, high temperature, easy agglomeration, low transmission efficiency, etc. problem, to achieve the effect of facilitating charge transfer, reducing adsorption energy, and avoiding agglomeration

Active Publication Date: 2020-02-14
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, molybdenum carbide as an electrocatalyst also has many challenges, such as low electron and charge transport efficiency, high Mo-H bond energy is not conducive to hydrogen precipitation, and easy agglomeration at high temperature.

Method used

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  • Ultrafine nitrogen-doped molybdenum carbide nanoparticle loaded on three-dimensional nitrogen-doped flower-shaped carbon spheres, as well as preparation method and application thereof
  • Ultrafine nitrogen-doped molybdenum carbide nanoparticle loaded on three-dimensional nitrogen-doped flower-shaped carbon spheres, as well as preparation method and application thereof
  • Ultrafine nitrogen-doped molybdenum carbide nanoparticle loaded on three-dimensional nitrogen-doped flower-shaped carbon spheres, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Sample preparation: Dissolve 1g of flower-shaped carbon spheres and 1g of cetyltrimethylammonium bromide in 75mL of deionized water and disperse evenly, then add 1.5g of ammonium molybdate and wait for the ammonium molybdate to dissolve and disperse evenly, then transfer to the reaction kettle , reacted at 200°C for 10 h, cooled to room temperature, filtered and washed the solution three times, and transferred to an oven at 80°C to dry the sample. Then collect the solid powder, anneal at a high temperature in an argon atmosphere, raise the temperature to 800°C at 5°C / min, keep it for 2 hours, and then cool it naturally to obtain ultrafine nitrogen-doped molybdenum carbide nanoparticles supported by three-dimensional nitrogen-doped flower-shaped carbon spheres electrocatalyst.

[0036] Electrocatalytic application: 2 mg of sample and 1 mg of conductive carbon are dissolved in 500 μL of alcohol-water mixture, and ultrasonically mixed to form a black suspension. Take 10 μL...

Embodiment 2

[0038] Sample preparation: Dissolve 1g of flower-shaped carbon spheres and 1g of cetyltrimethylammonium bromide in 75mL of deionized water and disperse evenly, then add 2.5g of ammonium molybdate and wait for the ammonium molybdate to dissolve and disperse evenly, then transfer to the reaction kettle , reacted at 200°C for 10 h, cooled to room temperature, filtered and washed the solution three times, and transferred to an oven at 80°C to dry the sample. Then collect the solid powder, anneal at a high temperature in an argon atmosphere, raise the temperature to 800°C at 5°C / min, keep it for 2 hours, and then cool it naturally to obtain ultrafine nitrogen-doped molybdenum carbide nanoparticles supported by three-dimensional nitrogen-doped flower-shaped carbon spheres electrocatalyst.

[0039] Electrocatalytic application: preparation and testing of electrodes are the same as in Example 1. The sample current density is 10mA / cm 2 , the overpotential in acidic solution is 82mV. ...

Embodiment 3

[0041] Sample preparation: Dissolve 1g of flower-shaped carbon spheres and 1g of hexadecyltrimethylammonium bromide in 75mL of deionized water and disperse evenly, then add 3.5g of ammonium molybdate and wait for the ammonium molybdate to dissolve and disperse evenly, then transfer to the reaction kettle , reacted at 200°C for 10 h, cooled to room temperature, filtered and washed the solution three times, and transferred to an oven at 80°C to dry the sample. Then collect the solid powder, anneal at a high temperature in an argon atmosphere, raise the temperature to 800°C at 5°C / min, keep it for 2 hours, and then cool it naturally to obtain ultrafine nitrogen-doped molybdenum carbide nanoparticles supported by three-dimensional nitrogen-doped flower-shaped carbon spheres electrocatalyst.

[0042] Electrocatalytic application: preparation and testing of electrodes are the same as in Example 1. The sample current density is 10mA / cm 2 , the overpotential in acidic solution is 11...

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Abstract

Ultrafine nitrogen-doped molybdenum carbide nanoparticle loaded on three-dimensional nitrogen-doped flower-shaped carbon spheres, as well as a preparation method and application thereof are disclosed.According to a technical scheme, the method mainly comprises (1) dissolving a surfactant and flower-shaped carbon spheres into water, carrying out ultrasonic dispersion, adding molybdate into the mixture, and carrying out ultrasonic dispersion until the molybdate is dissolved; and (2) transferring the mixed solution obtained in the step (1) into a reaction kettle, carrying out a hydrothermal reaction, then carrying out suction filtration, washing and drying, and carrying out high-temperature annealing treatment in an inert gas atmosphere to obtain the ultrafine nitrogen-doped molybdenum carbide nanoparticle loaded on three-dimensional nitrogen-doped flower-shaped carbon spheres. The design structure has ultrafine nanoparticles and a three-dimensional nitrogen-doped flower-like carbon skeleton, and nitrogen is doped into molybdenum carbide and the carbon skeleton at the same time, so that catalytic site exposure, rapid mass transfer and optimization of an electronic structure are facilitated, and the catalytic hydrogen evolution performance of the electrocatalyst is effectively improved.

Description

technical field [0001] The invention belongs to the field of catalytic materials, in particular to the field of hydrogen production catalysts by electrolysis of water, in particular to three-dimensional nitrogen-doped flower-shaped carbon spheres loaded with ultra-fine nitrogen-doped molybdenum carbide nanoparticle electrocatalysts and their preparation methods and electrolysis under acidic conditions Application in hydrogen production from water. Background technique [0002] With the progress of the times, the consumption of a large amount of fossil fuels and the resulting environmental problems force us to seek a clean and renewable energy source to replace fossil fuels. Therefore, the development of efficient clean and sustainable hydrogen energy technologies has attracted increasing attention. Electrocatalytic water splitting is one of the most efficient methods for hydrogen production. Currently, platinum-based materials are the most efficient electrocatalysts for th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/08C25B1/04
CPCB01J27/24C25B1/04C25B11/04B01J35/33B01J35/51Y02P20/133
Inventor 陈锡安王佳慧魏会方
Owner WENZHOU UNIVERSITY
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