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Preparation and electrocatalytic application of inverse-spinel type cobalt ferrite nano-powder with oxygen vacancy

A technology of cobalt ferrite and nano-powder, which is applied in the preparation and application of inorganic nano-powder, and can solve the problems of high technical requirements, unfavorable large-scale popularization, difficult operation, etc.

Inactive Publication Date: 2018-11-30
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods for introducing oxygen vacancies are complicated and difficult to operate, and the high technical requirements are not conducive to large-scale popularization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 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 ferrous chloride hexahydrate (0.3180 g, 1.6 mmol) and cobalt nitrate (0.1470 g, 0.6 mmol) in turn under stirring, and then add 1.8185 g of sodium carbonate to adjust the pH value of the reaction solution to 9.5. After sealing the hydrothermal autoclave, it was kept in an oven at 130 °C for 30 h. After natural cooling, deionized water and ethanol were used to centrifugally wash and dry in vacuum to obtain black cobalt ferrite nanopowder.

[0022] Step 2: Add 50 mL of deionized water into a 200 mL beaker, and add 85% hydrazine hydrate (6.0 mL, 100 mmol), cobalt ferrite nanopowder (50 mg, 0.2 mmol), and 30 o The stirring reaction was continued for 2 hours at C to obtain black cobalt ferrite nanopowder with oxygen defic...

Embodiment 2

[0030] 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 oxide (0.0639 g, 0.4 mmol) and cobalt acetylacetonate (0.0715 g, 0.2 mmol) under stirring, and then add 0.5351 g of hydroxide Sodium adjusted the pH value of the reaction solution to 8.5. After sealing the hydrothermal autoclave, it was kept in an oven at 160 °C for 30 h. After natural cooling, deionized water and ethanol were used to centrifugally wash and dry in vacuum to obtain black cobalt ferrite nanopowder.

[0031] Step 2: Take 50 mL of deionized water and add it to a 200 mL beaker, add tetrabutylammonium borohydride (6.4327 g, 25 mmol), cobalt ferrite nanopowder (25 mg, 0.1 mmol) in turn under stirring, 35 o The stirring reaction was continued for 6 hours at C to obtain black cobalt ferrite nanopowder ...

Embodiment 3

[0039] 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 chloride hexahydrate (0.2162 g, 0.8 mmol) and cobalt nitrate (0.0735 g, 0.3 mmol) under stirring, and then add 0.9351 g of citric acid Trisodium adjusted the pH value of the reaction solution to 8.0. After sealing the hydrothermal autoclave, it was kept in an oven at 140 °C for 26 h. After natural cooling, deionized water and ethanol were used to centrifugally wash and dry in vacuum to obtain black cobalt ferrite nanopowder.

[0040] Step 2: Add 50 mL of deionized water into a 200 mL beaker, and add sodium borohydride (1.8901 g, 50 mmol), cobalt ferrite nanopowder (50 mg, 0.2 mmol), 40 o Continue stirring and reacting at C for 4 hours to obtain black cobalt ferrite nanopowder with oxygen deficiency.

[0041] S...

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Abstract

The invention provides preparation and electrocatalytic application of inverse-spinel type cobalt ferrite nano-powder with oxygen vacancy. The preparation method comprises the following steps: firstly, preparing an alkaline cobalt iron aqueous solution and carrying out heating reaction to obtain cobalt ferrite nano-powder; secondly, introducing the oxygen vacancy into the obtained cobalt ferrite by using a normal temperature reduction method; finally, obtaining the cobalt ferrite nano-powder with the oxygen vacancy. The cobalt ferrite nano-powder with the oxygen vacancy has excellent catalyticproperties when being applied to electrocatalytic oxygen-producing reaction (OER), the overpotential drops to 0.330V (relative standard hydrogen electrode) and the Tafel slope is as low as 44 mV / dec.

Description

technical field [0001] The invention relates to the field of preparation and application of inorganic nanopowders, in particular to a method for preparing inverse spinel-type cobalt ferrite nanopowders with oxygen defects based on a hydrothermal method and its application in electrocatalytic water splitting. Background technique [0002] With the increasing dependence of today's society on fossil energy and the increasingly serious environmental pollution caused by its consumption, it is imminent to explore clean, efficient and renewable new energy sources. Among many new energy sources, hydrogen energy has become the focus of research because of its high energy density, clean and pollution-free, recyclable and other advantages. Hydrogen evolution by electrolysis of water has attracted widespread attention as a safe and efficient way to produce hydrogen. However, the electrolysis of water for hydrogen production has been greatly limited because the oxygen evolution half-rea...

Claims

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Application Information

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IPC IPC(8): B01J23/75C25B1/04C25B11/06B82Y40/00
CPCC25B1/04B82Y40/00B01J23/75C25B11/077B01J35/33Y02E60/36
Inventor 孙旭郭成英高令峰匡轩张勇魏琴
Owner UNIV OF JINAN
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