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A method for preparing multi-morphology nano-iron/cobalt oxides by cyclic voltammetry

A cyclic voltammetry, cobalt oxide technology, applied in nanotechnology, electrolysis components, electrolysis process, etc., can solve the problems of complex process, long operation time, difficult to control the crystal form, composition and purity of FeCo alloy nano oxide , to achieve the effect of simple process equipment, easy operation and low price

Active Publication Date: 2019-02-19
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the protection of inert gas and even high-temperature quenching are mostly required in the preparation and synthesis process, these methods generally have the disadvantages of complicated process and long operation time. At the same time, it is difficult to obtain the crystal form, composition and purity of FeCo alloy nano-oxide control

Method used

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  • A method for preparing multi-morphology nano-iron/cobalt oxides by cyclic voltammetry
  • A method for preparing multi-morphology nano-iron/cobalt oxides by cyclic voltammetry
  • A method for preparing multi-morphology nano-iron/cobalt oxides by cyclic voltammetry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Will Fe 83.3 Si 4 B 8 P 4 Cu 0.7 The amorphous alloy was used as the working electrode, and the platinum sheet was used as the auxiliary electrode. Cyclic voltammetry redox treatment was carried out in 0.5mol / L KOH alkaline solution, and the scanning speed was 50mV / s. Set the cycle potential to rise from -1.25V to 0.6V and then return to -1.25V as a cycle, apply 10 cycle cycles in the voltage range of -1.25-0.6V, then take out the working electrode, rinse and dry , to obtain nanoscale flake iron oxyhydroxide (FeOOH) oxide.

[0032] figure 1 is the triangular waveform diagram of the cyclic voltammetry potential changing with time, figure 2 It is the SEM picture of the product of this example. It can be seen that the nano-FeOOH oxide prepared according to this method has a continuous nano-sheet structure and a high specific surface area.

[0033] Other conditions remain the same, and the cycle period is changed: apply 100 cycle periods to obtain nano-scale flake F...

Embodiment 2

[0036] Will Fe 79.3 co 4 Si 4 B 8 P 4 Cu0.7 The amorphous alloy is used as the working electrode, the platinum sheet is used as the auxiliary electrode, and Ag / AgCl (saturated KCl) is used as the reference electrode. The cyclic voltammetry redox treatment is carried out in 0.5mol / L KOH alkaline solution, and the scanning speed is 50mV / s , set the cycle potential to rise from -1.25V to 0.6V and then return to -1.25V as a cycle period. After 10 cycles of application, the working electrode was then taken out, rinsed and dried to obtain nanoscale flake iron oxyhydroxide (FeOOH) oxide.

[0037] Depend on image 3 It can be seen that the nano-FeOOH oxide prepared according to this method has a continuous nano-sheet structure and a high specific surface area.

[0038] Other conditions remain the same, and the cycle period is changed: 90 cycle periods are applied to obtain nanoscale flake FeOOH oxide.

[0039] Other conditions remain the same, and the cycle period is changed: 1...

Embodiment 3

[0041] Will Fe 79.3 co 4 Si 4 B 8 P 4 Cu 0.7 The amorphous alloy is used as the working electrode, the platinum sheet is used as the auxiliary electrode, and Ag / AgCl (saturated KCl) is used as the reference electrode, and the cyclic redox treatment is carried out in 0.5mol / L KOH alkaline solution, and the scanning speed is 50mV / s. Set the cycle potential to rise from -1.25V to 0.6V and then return to -1.25V as a cycle period. After applying 600 cycles, the working electrode was then removed, rinsed and dried to obtain nanoparticulate Fe 3 o 4 A structure in which oxides and flower-shaped oxides coexist.

[0042] Depend on Figure 4 It can be seen that the Fe prepared by this method 3 o 4 The oxide is granular, and a large number of flower-like oxides are formed on the surface, which has a high specific surface area.

[0043] Other conditions remain the same, change the cycle: apply 200 cycles to get nano-particle Fe 3 o 4 Oxide and flower-like oxide coexistence st...

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Abstract

The invention discloses a method for preparing polymorphic nano-iron / cobalt oxide by means of cyclic voltammetry. The method comprises the steps that an amorphous FeCo alloy precursor is taken as a working electrode, a platinum sheet is taken as an auxiliary electrode, Ag / AgCl (saturated KCl) is taken as a reference electrode, and multicycle voltammetry scanning is performed in a KOH alkaline solution with the concentration being 0.5 mol / L; and the cycle period that the cycle potential rises to 0.6 V from minus 1.25 V and then turns back to be minus 1.25 V is set, and the scanning speed is setas 50 mV / s. The working electrode performs oxidation reduction and activation repeatedly during cycling, and finally nanoscale iron / cobalt oxide is formed on the surface of the electrode after n cycle periods are applied, and washing, cleaning and drying are completed. The preparation method is simple in process and environmentally friendly, and used equipment for the method is simple.

Description

technical field [0001] The invention relates to a method for preparing multi-morphology nano-iron / cobalt oxides by cyclic voltammetry, and belongs to the field of nano-metal functional materials. Background technique [0002] Among all metal elements, Fe is not only cheap, but also has a considerable annual output. Nano-metal oxides have a series of properties such as quantum size effect, small size effect, surface and interface effect, and macroscopic quantum tunneling effect due to their special size, so they are widely used as main catalysts, co-catalysts and supports in the field of catalysis. In addition, metal oxides with nano-spinel structure with octahedral structure are not only widely used in catalysis, but also typical magnetic materials. [0003] FeCo nanomaterials are widely used in catalysis, information storage, magnetic fluid and other fields. The synthesis methods of FeCo nanomaterials reported at this stage mainly include sol-gel method, chemical co-preci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00B82Y40/00
Inventor 淡振华付超群秦凤香常辉
Owner NANJING TECH UNIV