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Metal phosphide catalyst, preparation method and applications thereof

A metal phosphide and catalyst technology, applied in the field of metal phosphide catalysts and their preparation, can solve problems such as low conductivity, difficulty in adjusting structure and composition, etc., to reduce activation barrier, increase reaction active sites, and fast bubble escape Effect

Active Publication Date: 2020-04-21
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of low conductivity and difficult adjustment of structure and composition of existing hydrogen evolution catalysts in the prior art, the object of the present invention is to provide a metal phosphide catalyst with a porous structure and high conductivity based on cemented carbide and its Preparation method and application

Method used

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  • Metal phosphide catalyst, preparation method and applications thereof
  • Metal phosphide catalyst, preparation method and applications thereof
  • Metal phosphide catalyst, preparation method and applications thereof

Examples

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Effect test

Embodiment 1

[0037] Take by weighing WC powder (mass ratio 90%, particle size is 1.2 μm), Ni powder (mass ratio 2.5%, particle size is 1.5 μm) and Co (mass ratio 7.5%, particle size is 1.5 μ m), it is packed in the ball mill jar, and then additionally weigh 3% paraffin, pour it into alcohol after melting, mix and pack into the ball mill jar; the ratio of ball to material is 5:1, at 250r / min speed of ball milling for 24 hours and then dried to obtain a powder mixture. The resulting alloy powder mixture was then molded into billets under a pressure of 200 MPa. Then put the compact in a low-pressure sintering furnace, sinter at 1400° C. and 3 MPa argon atmosphere for 1 hour, and cool with the furnace to obtain a cemented carbide material. The obtained cemented carbide material was corroded at a constant potential of 0.7V for 30 minutes in a 1mol / L NaOH solution environment, and the WC on the surface layer of the cemented carbide was corroded to obtain a Ni-Co porous material. Every 0.5cm ...

Embodiment 2

[0039] Take by weighing WC powder (mass ratio 90%, particle size is 5 μ m), Ni powder (mass ratio 5%, particle size is 2 μ m) and Co (mass ratio 5%, particle size is 2 μm), put it into a ball mill jar, weigh additional 3% paraffin, melt it and pour it into alcohol, mix it and put it into a ball mill jar; the ball-to-material ratio is 3:1, and the Ball milled for 30 hours and then dried to obtain a powder mixture. The resulting alloy powder mixture was then molded into billets under a pressure of 150 MPa. Then put the compact in a low-pressure sintering furnace, sinter at 1450° C. and 5 MPa in an argon atmosphere for 1 hour, and cool with the furnace to obtain a cemented carbide material. The obtained cemented carbide material was corroded at a constant potential of 0.8V for 40 minutes in a 1mol / L NaOH solution environment, and the WC on the surface layer of the cemented carbide was corroded to obtain a Ni-Co porous material. Every 0.5cm 2 Take 0.2g of sodium hypophosphite f...

Embodiment 3

[0041] Weigh WC powder (mass ratio 90%, particle size 1.2 μm), Ni powder (mass ratio 5%, particle size 2 μm) and Co (mass ratio 5%, particle size 2 μm), put it into the ball mill jar, and then take additional 3% paraffin, melt it and pour it into alcohol, mix it and put it into the ball mill jar; the ball-to-material ratio is 5:1, and the After 24 hours of ball milling at a rotational speed, the mixture was dried to obtain a powder mixture. The resulting alloy powder mixture was then molded into billets under a pressure of 200 MPa. Then put the compact in a low-pressure sintering furnace, sinter at 1400° C. and 5 MPa in an argon atmosphere for 1 hour, and cool with the furnace to obtain a cemented carbide material. The obtained cemented carbide material was corroded at a constant potential of 0.7V for 50 minutes in a 1mol / L NaOH solution environment, and the WC on the surface layer of the cemented carbide was corroded to obtain a Ni-Co porous material. Every 0.5cm 2 Take 0....

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Abstract

The invention discloses a metal phosphide catalyst, a preparation method and applications thereof. According to the metal phosphide catalyst, a WC-Ni-Co hard alloy is used as a substrate, the surfaceis a porous structure, and a nickel-cobalt metal phosphide is contained in the pores of the porous structure and on the surface of the porous structure. According to the preparation method, a hard alloy is used as a substrate, the surface of the hard alloy is corroded to form a nickel-cobalt porous structure by carrying out selective electrochemical corrosion on WC, and the surface and the pores of the porous structure are partially phosphatized to form a nickel-cobalt metal phosphide through a phosphatization reaction, so that the tight connection and uniform distribution of the metal phosphide can be achieved through the preparation method, and the hydrogen evolution catalyst with high electrical conductivity and adjustable and controllable components and pore sizes is achieved.

Description

technical field [0001] The invention relates to a metal phosphide catalyst and its preparation method and application, belonging to the technical field of catalyst preparation. Background technique [0002] Hydrogen production by electrolysis of water is an important development direction to promote the utilization of sustainable and clean energy. Hydrogen can be used in hydrogenation reactions and environmentally friendly fuel cells, but the technology of electrolysis of water still needs to be improved. Due to the poor thermodynamic performance of water electrolysis, a higher overpotential than the theoretical minimum (1.23 V) is usually required for water electrolysis. In order to reduce the overpotential, it is necessary to develop highly efficient electrocatalysts to reduce the energy barrier and accelerate the reaction kinetics, so the study of highly active hydrogen evolution reaction electrocatalysts has far-reaching significance for the electrolysis of water to prod...

Claims

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Application Information

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IPC IPC(8): B01J27/185B01J35/00B01J35/10B01J37/28C25B1/04C25B11/06
CPCB01J27/1853B01J37/28C25B1/04C25B11/04B01J35/33B01J35/60Y02E60/36
Inventor 吝楠韩现奇马超王祖勇吴正刚
Owner HUNAN UNIV
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