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Preparation method of defective cobalt-doped iron disulfide porous hollow flower-like nano-powder and electrocatalytic application

A nano-powder, iron disulfide technology, applied in iron sulfide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of large electron transfer resistance, large band gap width, and few active sites

Active Publication Date: 2019-03-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, transition metals generally have shortcomings such as large band gap width, high electron transfer resistance, and few active sites, making them still face major challenges on the road to becoming an ideal electrocatalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Take a 50 mL hydrothermal reaction kettle for laboratory use. The hydrothermal reaction kettle has a stainless steel shell and a polytetrafluoroethylene liner. Take 40 mL of deionized water and add it to a 50 mL polytetrafluoroethylene liner, add ferric nitrate nonahydrate (0.8080 g, 2.0 mmol) and cobalt nitrate hexahydrate (0.2910 g, 1.0 mmol) sequentially under stirring, and heat the water under high pressure After the kettle was sealed, it was kept in an oven at 190 °C for 18 h. After natural cooling, deionized water and ethanol are used to centrifugally wash and dry in vacuum to obtain amorphous cobalt ferrite nanopowder.

[0019] Step 2: Take a 50 mL hydrothermal reaction kettle for laboratory use. The hydrothermal reaction kettle has a stainless steel shell and a polytetrafluoroethylene liner. Take 40 mL of dehydrated ethanol and add it into a 50 mL polytetrafluoroethylene liner, add thioacetamide (0.3757 g, 5.0 mmol) and amorphous cobalt ferrite nanopowd...

Embodiment 2

[0028] Step 1: Take a 50 mL hydrothermal reaction kettle for laboratory use. The hydrothermal reaction kettle has a stainless steel shell and a polytetrafluoroethylene liner. Take 40 mL of deionized water and add it into a 50 mL polytetrafluoroethylene liner, add cobalt chloride hexahydrate (0.3569 g, 1.5 mmol) and cobalt chloride hexahydrate (0.4054 g, 1.5 mmol) in sequence under stirring, and add the water After the autoclave was sealed, it was kept in an oven at 200 °C for 20 h. After natural cooling, deionized water and ethanol are used to centrifugally wash and dry in vacuum to obtain amorphous cobalt ferrite nanopowder.

[0029] Step 2: Take a 50 mL hydrothermal reaction kettle for laboratory use. The hydrothermal reaction kettle has a stainless steel shell and a polytetrafluoroethylene liner. Take 40 mL of dehydrated ethanol and add it to a 50 mL polytetrafluoroethylene liner, add Lawson's reagent (1.6179 g, 4.0 mmol) and amorphous cobalt ferrite nanopowder (40 mg) in ...

Embodiment 3

[0038] Step 1: Take a 50 mL hydrothermal reaction kettle for laboratory use. The hydrothermal reaction kettle has a stainless steel shell and a polytetrafluoroethylene liner. Take 40 mL of deionized water and add it to a 50 mL polytetrafluoroethylene liner, add cobalt acetylacetonate (0.3206 g, 0.9 mmol) and ferric ammonium citrate (1.1789 g, 4.5 mmol) in turn under stirring, and heat the autoclave After sealing, place in an oven at 180 °C for 10 h. After natural cooling, deionized water and ethanol are used to centrifugally wash and dry in vacuum to obtain amorphous cobalt ferrite nanopowder.

[0039] Step 2: Take a 50 mL hydrothermal reaction kettle for laboratory use. The hydrothermal reaction kettle has a stainless steel shell and a polytetrafluoroethylene liner. Take 40 mL of dehydrated ethanol and add it to a 50 mL polytetrafluoroethylene liner, add thiourea (0.1522 g, 2.0 mmol) and amorphous cobalt ferrite nanopowder (30 mg) sequentially under stirring, and continue st...

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Abstract

The invention provides a preparation method of defective cobalt-doped iron disulfide porous hollow flower-like nano-powder and electrocatalytic application. The preparation method comprises the following steps: preparing an iron and cobalt reaction solution, and heating to synthesize amorphous cobalt ferrite nano-powder; carrying out a vulcanization reaction by a solvothermal method so as to prepare cobalt-doped iron disulfide flower-like nano-powder; and finally, annealing in inert gas shielding, thereby obtaining the defective cobalt-doped iron disulfide porous hollow flower-like nano-powder. The defective cobalt-doped iron disulfide porous hollow flower-like nano-powder has excellent catalytic performance when applied to an electrocatalytic oxygen production reaction (OER), the overpotential is low to 0.270V (relative to a standard hydrogen electrode), and the Tafel slope is low to 40 mV / dec.

Description

technical field [0001] The invention relates to the field of preparation and application of inorganic nanopowder, in particular to a method for preparing defective cobalt-doped iron disulfide porous hollow flower-like nanopowder based on a solvothermal method and its application in electrocatalytic water splitting. Background technique [0002] The scarcity of fossil fuels such as oil and coal and the pollutants released during the energy release process are major issues facing sustainable development. Considering people's increasing requirements for quality of life, it is necessary to explore clean, efficient and renewable new energy sources (Wind energy, tidal energy, hydrogen energy, solar energy, etc.) have become the focus of research in the world today. It is worth noting that hydrogen energy has successfully attracted people's attention due to its excellent characteristics such as continuous stability, clean and renewable, and high energy density. Therefore, clean, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/12C25B1/06C25B11/06B82Y30/00
CPCB82Y30/00C01G49/12C25B1/04C25B11/00C25B11/091Y02E60/36
Inventor 孙旭郭成英高令峰马晓晶匡轩魏琴
Owner UNIV OF JINAN
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