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Carbon-coated two-dimensional transition metal phosphide and preparation method and application thereof

A transition metal and transition metal salt technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. Improved electrocatalytic hydrogen evolution performance, simple equipment, and good electrical conductivity

Pending Publication Date: 2020-12-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all have the following disadvantages: severe synthesis equipment is required, the reaction raw materials are poisonous and harmful, harsh reaction conditions (high temperature, high pressure and high vacuum), complex and cumbersome process, etc.
More importantly, most of the transition metal phosphide catalysts prepared are three-dimensional structures, with relatively few active sites exposed on the surface, and the catalytic activity is not high.

Method used

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  • Carbon-coated two-dimensional transition metal phosphide and preparation method and application thereof
  • Carbon-coated two-dimensional transition metal phosphide and preparation method and application thereof
  • Carbon-coated two-dimensional transition metal phosphide and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Preparation of carbon-coated cobalt phosphide two-dimensional nanosheets and their hydrogen evolution performance

[0035] (1) Preparation of carbon-coated cobalt phosphide two-dimensional nanosheets

[0036] Weigh 3 mmol of cobalt nitrate hexahydrate and dissolve in 30 mL of methanol solution, and ultrasonically dissolve to obtain solution A; weigh 3 mmol of dimethylimidazole and dissolve in 10 mL of methanol solution, and ultrasonically dissolve to obtain solution B. Under the condition of magnetic stirring, the solution A and the solution B were rapidly mixed, transferred to a water bath environment at 35° C., and kept at constant temperature for 24 hours. Then take it out and centrifuge with absolute ethanol to remove the supernatant to leave a solid powder, and vacuum dry to obtain a solid powder containing cobalt salt. The prepared powder is placed in a small porcelain boat, and the outer layer is a large porcelain boat that can wrap up and down the in...

Embodiment 2

[0042] Example 2: Preparation of carbon-coated nickel phosphide two-dimensional nanosheets and their hydrogen evolution performance

[0043] (1) Preparation of carbon-coated nickel phosphide two-dimensional nanosheets

[0044] Weigh 3mmol of nickel sulfate powder and dissolve in 30mL of dimethylformamide solution, ultrasonically dissolve to obtain solution A, weigh 3mmol of 1,4-phthalic acid and dissolve in 10mL of dimethylformamide solution, and ultrasonically dissolve to obtain solution B. Under the condition of magnetic stirring, the solution A and the solution B were mixed rapidly, and then transferred to a water bath environment at 35° C., and stood still for 24 hours. Then take it out and centrifuge with absolute ethanol to remove the supernatant to leave a solid powder, and dry it in vacuum to obtain a nickel-containing salt powder. The prepared nickel salt powder is placed in a small porcelain boat, and the outer layer is a large porcelain boat that can wrap the inner...

Embodiment 3

[0049] Example 3: Preparation of carbon-coated cobalt-nickel phosphide bimetallic two-dimensional nanosheets and their hydrogen evolution performance

[0050] (1) Preparation of carbon-coated cobalt-nickel phosphide bimetallic two-dimensional nanosheets

[0051] Weigh 0.6 mmol of cobalt nitrate hexahydrate and 2.4 mmol of nickel nitrate hexahydrate and dissolve in 30 mL of ethanol solution, and dissolve by ultrasonic to obtain solution A; weigh 3 mmol of dimethylimidazole and dissolve in 10 mL of ethanol solution, and dissolve by ultrasonic to obtain solution B. Under the condition of magnetic stirring, the solution A and the solution B were mixed rapidly, and then transferred to a water bath environment at 35° C., and stood still for 24 hours. Then take out and centrifuge with absolute ethanol to remove the supernatant to leave a solid powder, and vacuum dry to obtain the powder containing nickel-cobalt double metal salt. Place the prepared nickel-cobalt double metal salt po...

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Abstract

The invention provides a carbon-coated two-dimensional transition metal phosphide and a preparation method thereof, and an application of the carbon-coated two-dimensional transition metal phosphide in the field of electrocatalytic hydrogen evolution. The carbon-coated two-dimensional transition metal phosphide is developed around transition metal base phosphide, the microstructure of the carbon-coated two-dimensional transition metal phosphide is shaped into a porous structure composed of two-dimensional nanosheets through a constant-temperature water bath method at room temperature, and thenthe carbon-coated two-dimensional transition metal phosphide nano composite material is prepared through a gas phase phosphating method. The preparation method of the material has the advantages of simple process, low cost, environmental friendliness and the like; the prepared carbon-coated two-dimensional transition metal phosphide nano composite material has the advantages of large specific surface area, high electron transmission efficiency, good stability and the like, and has a relatively wide application prospect in the field of electro-catalytic hydrogen evolution.

Description

technical field [0001] The invention belongs to the technical field of nanostructure functional materials and electrocatalytic hydrogen evolution, and relates to a carbon-composite two-dimensional transition metal phosphide, a preparation method thereof, and an application in electrocatalytic hydrogen evolution. Background technique [0002] In recent years, the energy shortage and environmental pollution caused by the excessive development and utilization of traditional fossil fuels have become increasingly serious. How to effectively develop environmentally friendly, low-cost, abundant and renewable new energy has become an urgent problem for human society. Hydrogen energy has attracted widespread attention due to its advantages such as abundant reserves, high energy density, and being green and pollution-free. Among many hydrogen production technologies, electrolysis of water hydrogen production technology has the advantages of zero emission and high purity of hydrogen pr...

Claims

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Application Information

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IPC IPC(8): B01J27/185B01J37/03B01J37/08B01J35/10C25B11/06C25B1/04
CPCB01J27/1853B01J37/031B01J37/086B01J37/08C25B1/04B01J35/61Y02E60/36
Inventor 郑华均杨萍时晓伟舒旭伟
Owner ZHEJIANG UNIV OF TECH
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