Cobalt phosphide hierarchical porous nanowire material as well as preparation and application thereof

A cobalt phosphide nanometer and hierarchical porous technology, which is applied in the field of electrocatalysis, can solve the problems of poor structural stability of the soft template method, easy collapse of the product structure, complex template method technology, etc., to achieve nano-effects, reduce hydrogen evolution overpotential, The effect of improving electrocatalytic activity and stability

Pending Publication Date: 2021-01-22
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hard template method is difficult to remove the template, and the product structure is easy to collapse after template removal; the soft template method has poor structural stability and low synthesis efficiency
In addition, the template method process is more complicated and the cost is higher

Method used

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  • Cobalt phosphide hierarchical porous nanowire material as well as preparation and application thereof
  • Cobalt phosphide hierarchical porous nanowire material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) 0.356g CoCl 2 ·6H 2 O and 0.068g urea were dissolved in 37mL deionized water, heated to 40°C and kept for 30min. Subsequently, 2.25 mL of oleylamine was preheated in an oven at 65° C., and added to the aforementioned solution under slow stirring. After stirring evenly, the solution was transferred to a 50mL hydrothermal reactor and heated to 185°C for 12h. After cooling to room temperature, the product was centrifuged, washed several times with water and ethanol, and freeze-dried to obtain basic cobalt carbonate nanowires Co(OH) x (CO 3 ) y , x>0, y>0, and x+2y=3;

[0029] (2) 0.02g basic cobalt carbonate nanowire obtained in step (1) and 0.4g NaH 2 PO 2 After mixing evenly, put it in a quartz tube furnace, heat to 400°C at a rate of 3°C / min under the protection of argon and keep it for 2h, cool to room temperature, wash the product several times with deionized water, and dry to obtain cobalt phosphide Hierarchically porous nanowires.

[0030] figure 1 is ...

Embodiment 2

[0034] (1) 0.356g CoCl 2 ·6H 2O and 0.068g urea were dissolved in 37mL deionized water, heated to 40°C and kept for 30min. Subsequently, 2.25 mL of oleylamine was preheated in an oven at 65° C., and added to the aforementioned solution under slow stirring. After stirring evenly, the solution was transferred to a 50mL hydrothermal reactor and heated to 190°C for 20h. After cooling to room temperature, the product was centrifuged, washed several times with water and ethanol, and freeze-dried to obtain basic cobalt carbonate nanowires Co(OH) x (CO 3 ) y , x>0, y>0, and x+2y=3;

[0035] Subsequent process is identical with embodiment 1.

[0036] The microstructure of the product cobalt phosphide hierarchical porous nanowires is similar to that of Example 1, the main difference being that the nanowires become thicker, with a diameter of 100-250 nm.

[0037] Adopt the same method as embodiment 1 to carry out HER performance test, electrolyte is N 2 saturated 0.5M H 2 SO 4 ...

Embodiment 3

[0039] (1) 0.356g CoCl 2 ·6H 2 O and 0.068g urea were dissolved in 37mL deionized water, heated to 40°C and kept for 30min. Subsequently, 2.25 mL of oleylamine was preheated in an oven at 65° C., and added to the aforementioned solution under slow stirring. After stirring evenly, the solution was transferred to a 50mL hydrothermal reactor and heated to 200°C for 24h. After cooling to room temperature, the product was centrifuged, washed several times with water and ethanol, and freeze-dried to obtain basic cobalt carbonate nanowires Co(OH) x (CO 3 ) y , x>0, y>0, and x+2y=3;

[0040] Subsequent process is identical with embodiment 1.

[0041] The microstructure of the product cobalt phosphide hierarchical porous nanowires is similar to that of Example 1, the main difference being that the nanowires become thicker, with a diameter of 150-300 nm.

[0042] Adopt the same method as embodiment 1 to carry out HER performance test, electrolyte is N 2 saturated 0.5M H 2 SO 4...

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Abstract

The invention discloses a cobalt phosphide graded porous nanowire material, preparation thereof and an application thereof in water electrolysis hydrogen production reaction. In the cobalt phosphide hierarchical porous nanowire material, a large number of pores are distributed in the cobalt phosphide nanowire to form a hierarchical porous structure. The preparation method comprises the following steps: firstly, synthesizing basic cobalt carbonate nanowires, then carrying out controllable phosphorization, and simultaneously carrying out phosphorization and pore formation. According to the invention, the hydrogen evolution overpotential of cobalt phosphide can be reduced, and the electrocatalytic activity and stability are improved. The cobalt phosphide hierarchical porous nanowire has important application value as an electrocatalytic material, and the method is simple, efficient and capable of being used on a large scale.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to a cobalt phosphide hierarchical porous nanowire material and its preparation and application. Background technique [0002] Energy and environmental problems are the main problems facing the development of today's society, and the development of new, recyclable and clean energy is an effective measure to solve this problem. Compared with other energy sources, hydrogen energy has high combustion value, no pollution, and is renewable. It is an ideal clean energy to replace traditional fossil fuels. Although there are many methods of hydrogen production, such as hydrogen production from fossil fuels, there are problems such as complex processes, high energy consumption, and environmental pollution, or photocatalytic hydrogen production, but there are shortcomings such as low conversion efficiency. [0003] Hydrogen production from water electrolysis (HER) has attracted ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J35/02B82Y40/00C01B25/08C25B1/04C25B11/075
CPCB01J27/1853B01J35/0033B01J35/023C01B25/08B82Y40/00C25B1/04C01P2002/01C01P2004/03C01P2004/04Y02E60/36
Inventor 严微微
Owner CHINA JILIANG UNIV
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