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Nickel boride-modified graphite-phase carbon nitride catalyst and preparation method thereof

A graphite-phase carbon nitride and nickel boride technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve low conductivity, low specific surface area, few electrocatalytic fields, etc. problems, to achieve the effect of cheap raw materials, increasing the specific surface area, and increasing the pore volume of the catalyst

Active Publication Date: 2017-11-07
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Traditional graphitic carbon-nitrogen catalysts are rarely used in the field of electrocatalysis due to their low conductivity and low specific surface area.

Method used

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  • Nickel boride-modified graphite-phase carbon nitride catalyst and preparation method thereof
  • Nickel boride-modified graphite-phase carbon nitride catalyst and preparation method thereof
  • Nickel boride-modified graphite-phase carbon nitride catalyst and preparation method thereof

Examples

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Embodiment 1

[0019] Put the urea into the crucible, put the lid on and raise the temperature to 500°C in the muffle furnace at a rate of 10°C / min, keep it warm for two hours, wash and dry to obtain the graphite phase carbon nitride raw material for use. Dissolve 4.4g of nickel chloride hexahydrate evenly in 200ml of deionized water, and then add 1.41g of sodium borohydride. After the precipitation is complete, collect it by filtration, wash and dry it for later use. Mix 9.999g of graphite phase carbon nitride and 0.001g of nickel boride in an agate mortar, add 100ml of alcohol, and grind for 2 hours, during which alcohol should be continuously replenished; after drying the mixed material for 2 hours, the mixture should be dried at 5°C / min The heating rate was increased to 450°C in a muffle furnace, and kept for 2 hours. Finally, the sintered mixture was washed and dried to obtain a nickel boride-modified graphite phase carbon nitride catalyst.

[0020] Figure 4 The line scan polarization...

Embodiment 2

[0023] Put the urea into the crucible, put the lid on and raise the temperature to 500°C in the muffle furnace at a rate of 10°C / min, keep it warm for two hours, wash and dry to obtain the graphite phase carbon nitride raw material for use. Dissolve 4.64g of nickel chloride hexahydrate evenly in 200ml of deionized water, add 2.27g of sodium borohydride into the nickel chloride hexahydrate solution prepared above, and collect it by filtration after precipitation is complete, wash and dry for later use. Mix 9.996g of graphitic carbon nitride and 0.004g of nickel boride in an agate mortar, add 100ml of alcohol, and grind for 2 hours, during which the alcohol should be replenished continuously. After drying the mixed material for 4 hours, raise the temperature to 500°C in a muffle furnace at a rate of 10°C / min, and keep it warm for 2h, and finally wash and dry the sintered mixture to obtain nickel boride-modified graphite phase nitrogen carbonization catalyst.

[0024] Such as f...

Embodiment 3

[0030] Put the urea into the crucible, put the lid on and raise the temperature to 500°C in the muffle furnace at a rate of 10°C / min, keep it warm for two hours, wash and dry to obtain the graphite phase carbon nitride raw material for use. Dissolve 4.75g of nickel chloride hexahydrate evenly in 200ml of deionized water, add 2.65g of sodium borohydride into the nickel chloride hexahydrate solution prepared above, and wait until the precipitation is complete, collect it by filtration, wash and dry, and prepare it several times until you get Enough nickel boride. 9.993 g of graphitic carbon nitride and 0.007 g of nickel boride were mixed in a mixer for 2 hours. After drying the mixed material for 3 hours, raise the temperature to 550°C in a muffle furnace at a rate of 15°C / min, and keep it warm for 2.5h, and finally wash and dry the sintered mixture to obtain a nickel boride-modified graphite phase carbon nitride catalyst.

[0031] Figure 4 The line scan polarization curve o...

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Abstract

The invention discloses a nickel boride-modified graphite-phase carbon nitride catalyst, of which the specific surface area is 50-160m<2> / g, the pore volume is 0.2-0.7cm<3> / g and the thickness is 1-5nm. The nickel boride-modified graphite-phase carbon nitride catalyst comprises the following chemical components in percentage by weight: 99.9-99.99% of graphite-phase carbon nitride and 0.1-0.01% of nickel boride. A preparation method of the catalyst mainly comprises the steps of with nickel boride synthesized by an oxidation-reduction method and graphite-phase carbon nitride burnt and synthesized by urea as precursors, mixing the nickel boride and the graphite-phase carbon nitride, sintering in a muffle furnace to a certain temperature, cooling to room temperature and carrying out washing and drying to obtain the final catalyst. The raw materials are cheap and environmentally friendly, the preparation process is simple, the specific surface area of the catalyst is increased, the pore volume of the catalyst is increased, the thickness of the catalyst is reduced, the catalytic performance is improved, the lowest initial overpotential reaches 100mV, the overpotential is 707mV under the current density of 10mA / cm<2> and the lowest Tafel slope is 221mV / dec.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a carbon-nitrogen-based catalyst and a preparation method thereof. Background technique [0002] Graphite carbon nitride has a layered structure of graphite and has a wide range of applications in the field of catalysis, such as: splitting water, reducing carbon dioxide, etc. It has the advantages of special electronic structure, excellent chemical and thermodynamic stability, simple production process and cheap and environmentally friendly raw materials. [0003] Traditional graphitic carbon-nitrogen catalysts are rarely used in the field of electrocatalysis due to their low electrical conductivity and low specific surface area. Contents of the invention [0004] The object of the present invention is to provide a nickel boride-modified graphite phase carbon nitride catalyst with simple production process, cheap raw materials, environmental protection and improved catalytic...

Claims

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Application Information

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IPC IPC(8): B01J27/24
CPCB01J27/24
Inventor 张新宇曹萌秦家千马明臻刘日平
Owner YANSHAN UNIV
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