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.
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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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