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Phosphide with hierarchical structure, and preparation method and applications thereof

A hierarchical structure, phosphide technology, applied in phosphide, phosphorus compounds, chemical instruments and methods, etc., can solve the problems of complex experimental process, high cost, long reaction period, etc., to achieve rich pore structure, low price, and commercialization the effect of

Inactive Publication Date: 2019-07-02
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a hierarchical structure phosphide, its preparation method and application. - Phosphate with hierarchical structure prepared by immobilization phosphating method, the phosphide is a transition metal phosphide, its microscopic appearance is a hollow nanosphere with a diameter of 500-1500nm, and the outside is a shell assembled by nanosheets, the microstructure promotes The exposure of the phosphide active site improves the electrocatalytic activity of the phosphide; thereby solving the disadvantages of complex experimental process, long reaction period and high cost in the preparation of hierarchical structure phosphide by the template method in the prior art

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  • Phosphide with hierarchical structure, and preparation method and applications thereof
  • Phosphide with hierarchical structure, and preparation method and applications thereof
  • Phosphide with hierarchical structure, and preparation method and applications thereof

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preparation example Construction

[0035] A kind of preparation method of hierarchical structure phosphide provided by the invention comprises the following steps:

[0036] (1) Prepare nano-transition metal alkoxides by solvothermal method: dissolve transition metal salts and polyols in a solvent to obtain a mixed solution, heat to 130-190°C for 5-10 hours, after the reaction, wash and dry Obtain transition metal alkoxide nanospheres;

[0037] (2) Treat transition metal alkoxides with hydrothermal method to prepare hierarchical structure hydroxides: disperse the transition metal alkoxides obtained in step (1) in water, heat and keep warm for 3-10 hours, after the hydrothermal reaction ends, wash and dry Obtain hierarchical structure hydroxide;

[0038] (3) Utilize the gas-solid phosphating method to process the hierarchical structure hydroxide to obtain the hierarchical structure phosphide: the hierarchical structure hydroxide and the phosphorus source obtained in step (2) are respectively placed in different ...

Embodiment 1

[0053] In this embodiment, the reaction raw materials are nickel nitrate, cobalt nitrate, glycerol and isopropanol, the concentration of nitrate is 2.25mg / mL, the molar ratio of nickel nitrate and cobalt nitrate is 1:1; The ratio is 1:5.

[0054] A preparation method of NiCoP with hierarchical structure, comprising the following steps:

[0055] (1) Preparation of nano-nickel-cobalt glycerate by solvothermal method:

[0056] Put cobalt nitrate, nickel nitrate, 6mL glycerin and 30mL isopropanol in a 50mL reaction kettle, heat it to 170°C and keep it warm for 5 hours. After the reaction, wash it with a large amount of ethanol and dry it in vacuum at 60°C to obtain nickel-cobalt glycerate nanospheres.

[0057] (2) adopting hydrothermal method to process glycerate to prepare hierarchical structure nickel-cobalt hydroxide:

[0058] Disperse the nickel-cobalt glycerate obtained in step (1) evenly in 30mL of water, pour it into a reaction kettle, heat it to 150°C and keep it warm f...

Embodiment 2

[0066] In this embodiment, the reaction raw materials are nickel nitrate, cobalt nitrate, glycerol and isopropanol, the concentration of nitrate is 4.5mg / mL, and the molar ratio of nickel nitrate and cobalt nitrate is 1:2; The volume of glycerol and isopropanol The ratio is 1:5. The preparation process is the same as that of Example 1. First, the metal alkoxide is prepared, and then the metal alkoxide is hydrothermally treated to obtain a hierarchical structure hydroxide, and the hierarchical structure NiCo is obtained through the gas-solid phosphating method. 2 P, the product morphology is as Figure 6 shown.

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Abstract

The invention belongs to the field of electrochemistry energy material, and more specifically relates to a phosphide with a hierarchical structure, and a preparation method and applications thereof, and especially relates to a phosphide which possesses a hierarchical structure, and is high in water electrolysis catalytic activity and stability, and a preparation method and applications thereof. According to the preparation method, a transition metal salt and a polyol are taken as raw materials, solvothermal method, hydrothermal method, and gas-solid phosphatization method are adopted to prepare the phosphide with a hierarchical structure. The microscopic morphology of the phosphide with a hierarchical structure is hollow nanospheres, and the external part is a nanometer sheet assembled shell layer. The hierarchical structure is capable of promoting exposure of phosphide active sites, and increasing phosphide electrocatalytic activity; and problems in the prior art that experiment process is complex, and cost is high in a conventional template method are solved.

Description

technical field [0001] The invention relates to phosphides as water electrolysis catalysts, belonging to the field of electrochemical energy materials, in particular, to a hierarchical structure of phosphides, its preparation method and application, especially to a hierarchical structure with high-efficiency electrolytic water catalytic activity and high stability Phosphide and its preparation method and application. Background technique [0002] Efficient and stable catalysts are critical to the operation of water electrolysis devices. Currently, the electrolytic water catalysts used in industry are mainly noble metal catalysts. The global reserves of precious metals are limited, and the development costs are high and expensive, which greatly increases the cost of water electrolysis. Therefore, the development of non-noble metal catalysts with excellent performance to replace noble metals can effectively reduce the cost of electrolysis of water and promote the rapid develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/08B01J27/185B01J35/10C25B1/04C25B11/06
CPCC01B25/08C01B25/088B01J27/185C25B1/04C01P2004/34C01P2004/62C01P2004/61C01P2004/03C01P2002/72C01P2006/12C25B11/075B01J35/33B01J35/60B01J35/61Y02E60/36
Inventor 王得丽刘旭坡邓邵峰梁嘉宁黄亭
Owner HUAZHONG UNIV OF SCI & TECH
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