Preparation method of polyhedral cobalt phosphide catalyst for hydrogen production through water electrolysis

A technology for electrolysis of water and catalysts, which is applied in physical/chemical process catalysts, chemical instruments and methods, electrolysis processes, etc., can solve the problems of reduced catalytic activity, agglomeration of catalyst particles, irregular morphology, etc., and achieves simple process flow and product quality. The effect of high purity and high specific surface area

Active Publication Date: 2015-12-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, due to the large particle size and irregular shape of transition metal phosphides prepared by traditional methods, the surface active sites are not exposed much, and its catalytic performance cannot be fully exerted; in addition, after long-range operation, the catalyst Particles are prone to agglomeration and surface contamination, resulting in reduced catalytic activity and poor stability

Method used

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  • Preparation method of polyhedral cobalt phosphide catalyst for hydrogen production through water electrolysis
  • Preparation method of polyhedral cobalt phosphide catalyst for hydrogen production through water electrolysis
  • Preparation method of polyhedral cobalt phosphide catalyst for hydrogen production through water electrolysis

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Embodiment 1

[0018] A preparation method of polyhedral cobalt phosphide electrolysis water hydrogen production catalyst, comprising the following steps:

[0019] 1) Preparation of polyhedral metal-organic framework ZIF-67: Weigh 0.996g Co(NO 3 ) 2 ·6H 2 O and 1.312g 2-methylimidazole were dissolved in 100ml methanol respectively, and after stirring and dissolving, the 2-methylimidazole solution was poured into Co(NO 3 ) 2 solution, stirred for 8 minutes, aged at room temperature for 18 hours after the stirring was stopped, the product was centrifuged, washed 3 times with methanol, and finally placed at 60°C for 8 hours in vacuum. Purple, the shape is rhombic dodecahedron, the particle size is 600nm;

[0020] 2) Preparation of polyhedral cobalt phosphide water electrolysis catalyst for hydrogen production: put the polyhedral metal organic framework ZIF-67 prepared in step 1) into a tube furnace, and calcinate at 300°C for 2 hours in an air atmosphere to obtain a black polyhedral Three ...

Embodiment 2

[0027] A preparation method of polyhedral cobalt phosphide electrolysis water hydrogen production catalyst, comprising the following steps:

[0028] 1) Preparation of polyhedral metal-organic framework ZIF-67: Weigh 0.996g Co(NO 3 ) 2 ·6H 2 O and 1.312g 2-methylimidazole were dissolved in 100ml methanol respectively, and after stirring and dissolving, the 2-methylimidazole solution was poured into Co(NO 3 ) 2 solution, stirred for 12 minutes, aged at room temperature for 20 hours after stopping the stirring, centrifuged the product, washed 3 times with methanol, and finally placed it in vacuum at 80°C for 10 hours. Purple, the shape is rhombic dodecahedron, the particle size is 750nm;

[0029] 2) Preparation of polyhedral cobalt phosphide water electrolysis catalyst for hydrogen production: put the polyhedral metal organic framework ZIF-67 prepared in step 1) into a tube furnace, and calcinate at 400°C for 4 hours in an air atmosphere to obtain a black polyhedral Three co...

Embodiment 3

[0034] A preparation method of polyhedral cobalt phosphide electrolysis water hydrogen production catalyst, comprising the following steps:

[0035] 1) Preparation of polyhedral metal-organic framework ZIF-67: Weigh 0.996g Co(NO 3 ) 2 ·6H 2 O and 1.312g 2-methylimidazole were dissolved in 100ml methanol respectively, and after stirring and dissolving, the 2-methylimidazole solution was poured into Co(NO 3 ) 2 solution, stirred for 15 minutes, aged at room temperature for 24 hours after the stirring was stopped, the product was centrifuged, washed 3 times with methanol, and finally placed in 120°C for 12 hours in vacuum, the product obtained was the polyhedral metal organic framework ZIF-67, and the product was blue Purple, the shape is rhombic dodecahedron, the particle size is 900nm;

[0036] 2) Preparation of polyhedral cobalt phosphide water electrolysis catalyst for hydrogen production: put the polyhedral metal organic framework ZIF-67 prepared in step 1) into a tube f...

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Abstract

A preparation method of a polyhedral cobalt phosphide catalyst for hydrogen production through water electrolysis comprises steps as follows: Co(NO3)2*6H2O and 2-methylimidazole are dissolved in methanol respectively, a 2-methylimidazole solution is poured into a Co(NO3)2 solution, the mixture is stirred and then aged at the room temperature, a product is centrifugally separated, vacuum drying is performed after washing with methanol, and a polyhedral metal organic frame ZIF-67 is obtained; then the polyhedral metal organic frame ZIF-67 is placed in a tube furnace, cobaltosic oxide is obtained through calcination in the air atmosphere, then the cobaltosic oxide and NaH2PO2*H2O are placed at two ends of a porcelain boat respectively, the NaH2PO2*H2O is located in the windward position of the tube furnace, and the polyhedral cobalt phosphide catalyst for hydrogen production through water electrolysis is obtained through calcination in the inert atmosphere. The crystallinity of the prepared cobalt phosphide catalyst material is high, the polyhedral morphology of a metal organic frame template is kept, the catalyst shows excellent properties in an electrocatalytic hydrogen evolution reaction, and the preparation technology is simple in process.

Description

technical field [0001] The invention belongs to the field of materials and energy, and in particular relates to a preparation method of a polyhedral cobalt phosphide electrolyzing water hydrogen production catalyst. Background technique [0002] Hydrogen (H 2 ) due to high energy density and no CO in the energy conversion process 2 It is widely used in the petrochemical industry, including synthetic ammonia, methanol, hydrogenation reactions in petroleum refining processes, and fuel cells and solar cells in energy technology. H used in most industrial processes 2 Steam reforming reactions from natural gas or methane, but the natural gas used in this process is a non-renewable resource and the CO 2 The emission problem is very serious and has not been well resolved so far. At present, methods such as thermal decomposition hydrogen production, solar hydrogen production and biomass hydrogen production have appeared one after another, but from the perspective of conversion e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J35/10C25B1/04
CPCY02E60/36
Inventor 李景虹刘梦佳
Owner TSINGHUA UNIV
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