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A graphene-wrapped molybdenum carbide/carbon microsphere electrocatalyst and its preparation method and its application in hydrogen production by electrolysis of water under acidic conditions

An electrocatalyst, graphene technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, chemical instruments and methods, etc., can solve the problems of reduced specific surface area, unfavorable practical application, complex preparation method, etc., to reduce adsorption. energy, accelerated charge transfer rate, and simple preparation process

Active Publication Date: 2019-03-05
WENZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after high temperature treatment, carbides will undergo polymerization, making the size larger and the specific surface area reduced; CN106925312 discloses a molybdenum carbide-doped linear polymer modified graphene composite material and a preparation method thereof, in which molybdenum carbide nanometer The particles are uniformly dispersed in polymers and graphene, but its preparation method is relatively complicated, which is not conducive to practical application

Method used

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  • A graphene-wrapped molybdenum carbide/carbon microsphere electrocatalyst and its preparation method and its application in hydrogen production by electrolysis of water under acidic conditions
  • A graphene-wrapped molybdenum carbide/carbon microsphere electrocatalyst and its preparation method and its application in hydrogen production by electrolysis of water under acidic conditions
  • A graphene-wrapped molybdenum carbide/carbon microsphere electrocatalyst and its preparation method and its application in hydrogen production by electrolysis of water under acidic conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Sample preparation: Dissolve 1g molybdate and 14mL 7.2mg / mL graphene oxide in 28mL deionized water, dissolve 1g chitosan in a mixed solvent of 2mL acetic acid and 186mL deionized water, and then mix the two solutions , Stirring at a speed of 500-1600 r / min. The mixed solution is spray-dried, and the temperature is set to 100~130℃ during spray drying, and the sampling speed is 4~6mL / min. Then the solid powder is collected and annealed at a high temperature under argon atmosphere. The temperature is raised to 750℃ for 6 hours, and the temperature is kept warm. After 3 hours of natural cooling, graphene-wound molybdenum carbide / carbon microsphere electrocatalyst was obtained.

[0028] Electrocatalytic application: 2mg of sample and 1mg of conductive carbon are dissolved in 500μL of alcohol-water mixture and mixed uniformly by ultrasound to form a black suspension. Pipette 10μL of the suspension onto the glassy carbon electrode, dry it naturally and then drop it. Add 5μL of N...

Embodiment 2

[0030] Sample preparation: Dissolve 1g molybdate and 42mL7.2mg / mL graphene oxide in 28mL deionized water, dissolve 1g chitosan in a mixed solvent of 2mL acetic acid and 158mL deionized water, and then mix the two solutions , Stirring at a speed of 500-1600 r / min. The mixed solution is spray-dried, and the temperature is set to 100~130°C during spray drying, and the sampling speed is 4~6mL / min. Then, the solid powder is collected, annealed at a high temperature under argon atmosphere, and heated to 750°C for 6 hours, and kept warm. After 3 hours of natural cooling, the graphene-wound molybdenum carbide / carbon microsphere electrocatalyst was obtained.

[0031] Electrocatalysis application: preparation and testing of electrodes are the same as in Example 1. The current density of the sample is 10mA / cm 2 When the overpotential is 70mV. This sample has the best electrocatalytic performance.

Embodiment 3

[0033] Sample preparation: Dissolve 1g molybdate and 70mL7.2mg / mL graphene oxide in 28mL deionized water, dissolve 1g chitosan in a mixed solvent of 2mL acetic acid and 130mL deionized water, and then mix the two solutions , Stirring at a speed of 500-1600 r / min. The mixed solution is spray-dried, and the temperature is set to 100~130°C during spray drying, and the sampling speed is 4~6mL / min. Then, the solid powder is collected, annealed at a high temperature under argon atmosphere, and heated to 750°C for 6 hours, and kept warm. After 3 hours of natural cooling, the graphene-wound molybdenum carbide / carbon microsphere electrocatalyst was obtained.

[0034] Electrocatalysis application: preparation and testing of electrodes are the same as in Example 1. The current density of the sample is 10mA / cm 2 When the overpotential is 96mV.

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Abstract

The invention belongs to the field of catalytic materials, and relates to a graphene-wound molybdenum carbide / carbon microsphere electrocatalyst and its preparation method and its application in electrolyzing water to produce hydrogen under acidic conditions, comprising the following steps: Step 1: combining molybdate and oxidation Graphene is dissolved in water, and chitosan is dissolved in a mixed solvent of acetic acid and water, and then the two solutions are mixed and stirred at a certain speed; step 2: the mixed solution of step 1 is spray-dried, and then the solid powder is collected, and the High-temperature annealing treatment in an inert gas atmosphere to obtain a graphene-wrapped molybdenum carbide / carbon microsphere electrocatalyst. The graphene-wrapped molybdenum carbide / carbon microspheres prepared by the present invention have uniform size, uniform dispersion of molybdenum carbide nanoparticles, simple preparation process, convenient operation, strong controllability, and excellent electrochemical performance in electrolysis of water for hydrogen evolution. performance.

Description

Technical field [0001] The invention belongs to the field of catalytic materials, and relates to a graphene-wound molybdenum carbide / carbon microsphere electrocatalyst, a preparation method thereof, and application in hydrogen production by electrolyzing water under acidic conditions. Background technique [0002] With the rapid development of modern society, global environmental pollution is serious, energy consumption is rapid, and resources are scarce. There is an urgent need for a clean and renewable energy source. Therefore, the development of effective clean and sustainable hydrogen energy technology has attracted more and more attention. In the past few years, hydrogen has been hailed as a promising energy source to reduce our dependence on fossil fuels. , Reduce the emission of greenhouse gases and other toxic gases, and benefit the environment. In the past few years, more and more attention has been focused on the production of hydrogen through sustainable electrochemic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/22B01J37/084B01J35/33Y02E60/36
Inventor 陈锡安魏会方奚乔亚黄少铭
Owner WENZHOU UNIV
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