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Nitrogen-doped cobalt phosphide/nanocarbon compound material and preparation method and application thereof

A technology of nano-carbon materials and composite materials, which is applied in the field of hydrogen production by electrolysis of water, can solve the problems of unsatisfactory hydrogen production performance, easy generation of phosphine and toxic gases, etc., and achieve excellent hydrogen production performance, improve hydrogen production performance, and improve The effect of stability

Inactive Publication Date: 2019-04-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the existing technical deficiencies in the field of preparation of cobalt phosphide / nanocarbon composite materials, such as unsatisfactory hydrogen production performance, large amount of phosphorus used in the preparation process, and easy generation of phosphine poisonous gas, the first purpose of the present invention is a nitrogen-doped The preparation method of the cobalt phosphide / nano-carbon composite material aims to improve the hydrogen production performance and stability of the obtained material, not only that, but also to avoid the hazards of personnel and the environment during the preparation process

Method used

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  • Nitrogen-doped cobalt phosphide/nanocarbon compound material and preparation method and application thereof
  • Nitrogen-doped cobalt phosphide/nanocarbon compound material and preparation method and application thereof
  • Nitrogen-doped cobalt phosphide/nanocarbon compound material and preparation method and application thereof

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Embodiment 1

[0057] Step (1): Synthesis of polyvinylphosphonic acid: Polyvinylphosphonic acid was synthesized according to the method reported by Millaruelo et al. Weigh 5g of vinyl acid monomer and 0.15g of azobisisobutyronitrile into a 100ml round bottom flask, then add 28ml of ethyl acetate as a solvent into the flask, cover with a rubber stopper, and place the system in liquid nitrogen quickly, The reaction system was evacuated under the condition of liquid nitrogen freezing, the temperature was raised to normal temperature and filled with dry nitrogen, and after repeated operations for 3-5, the temperature of the reaction system was raised to 60° C. for 6 hours of reaction. After the reaction, the reaction solvent was spin-dried, and then an appropriate amount of water was added to dissolve the sample, and then dialyzed in water, changing the water every 2 hours, dialyzed for two days, and freeze-dried to obtain polyvinylphosphonic acid (white solid).

[0058] Step (2): Preparation of...

Embodiment 2

[0067] Compared with Example 1, the difference is only that in step (2), the amount of cobalt chloride hexahydrate is 1.1g (P / Co molar ratio is 1:1), and through step (3) calcining, obtain cobalt phosphide / Carbon in situ composites without step (4) carbon composite. The XRD spectrum pattern of the product that this case obtains is attached figure 1 As shown, by comparing with the standard map, it shows that the Co 2 P / CoP. When the current density is 10mAcm -2 , the material has an overpotential of 151mV and a Tafel slope of 109mV dec -1 .

Embodiment 3

[0069] Compared with Example 1, the difference is only that in step (2), the amount of cobalt chloride hexahydrate is 2.2g (P / Co molar ratio is 1:2), and through step (3) calcining, obtain cobalt phosphide / Carbon in situ composites without step (4) carbon composite. The XRD spectrum pattern of the product that this case obtains is attached figure 1 As shown, by comparing with the standard map, it shows that the Co 2 p. When the current density is 10mAcm -2 , the material has an overpotential of 220mV and a Tafel slope of 115mV dec -1 .

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Abstract

The invention belongs to the field of hydrogen-generating materials, and specifically discloses a preparation method of a nitrogen-doped cobalt phosphide / nanocarbon compound material. A phosphorus source, a cobalt source and monomers for synthesizing gel are polymerized under a polymerization aid to obtain double-network hydrogel, wherein the phosphorus source is at least one of a polymer containing phosphonic acid groups and a monomer compound containing phosphonic acid groups; the double-network hydrogel is freeze-dried to obtain xerogel; the xerogel is calcined in a protective atmosphere at750-1,000 DEG C; a calcined product is compounded with a nanocarbon material to obtain the nitrogen-doped cobalt phosphide / nanocarbon compound material. The preparation method is simple, the sourcesof the raw materials are wide, the cost is low, and the obtained nitrogen-doped cobalt phosphide / nanocarbon material has excellent electrocatalytic performance and is expected to be applied in industrial production.

Description

technical field [0001] The invention belongs to the field of hydrogen production by electrolysis of water, and relates to a nitrogen-doped cobalt phosphide, in particular to a nitrogen-doped cobalt phosphide / carbon nanomaterial high-efficiency hydrogen evolution composite material and a preparation method thereof. Background technique [0002] Hydrogen energy is a renewable new energy source, and hydrogen economy will be a promising solution to the problems of environmental pollution and fossil fuels. In the current energy system, hydrogen can be used as an ideal clean energy to replace petroleum due to its high energy density and environmental protection. The key is to be able to develop a cost-effective hydrogen production process. At present, the electrochemical water splitting hydrogen production that has been carried out can be used as a research for next-generation energy conversion. Although, noble metal (such as Pt, Ir, Pd) catalysts exhibit low overpotential and lo...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/24B01J35/33Y02E60/36
Inventor 孙晓毅王丛森李娟
Owner CENT SOUTH UNIV
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