Preparation method and application of snowflake-like iron oxide nanostructure supercapacitor material
A supercapacitor and iron oxide nanotechnology, which is applied in the manufacture of hybrid/electric double layer capacitors, iron oxide, hybrid capacitor electrodes, etc., can solve the problems of poor uniformity of synthetic morphology, complex methods, poor controllability, etc., and achieve excellent The effect of electrochemical performance, simple operation and easy regulation
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Embodiment 1
[0035] In this embodiment, the preparation method of snowflake-like iron oxide nanostructure supercapacitor material is as follows:
[0036] (1) Prepare 60 mL of a mixed solvent of ethylene glycol and deionized water, wherein the volumes of ethylene glycol and deionized water are 40 mL and 20 mL, respectively.
[0037] (2) Add 0.05mol ferric nitrate nonahydrate, 0.01mol urea and 0.01mol ammonium fluoride to the configuration solution in step (1) successively, stir magnetically for 10 minutes to dissolve, and then quickly add 0.0025mol sodium borohydride under stirring conditions .
[0038] (3) Transfer the solution prepared in step (2) to a 100 mL hydrothermal reaction kettle, and heat the reaction at 180° C. for 12 hours.
[0039] (4) After the reaction is completed, after natural cooling to room temperature, the obtained reaction precipitates are centrifugally washed with deionized water and ethanol, and dried in air at 80°C for 10 hours to obtain snowflake-shaped iron oxid...
Embodiment 2
[0042] In this embodiment, the preparation method of snowflake-like iron oxide nanostructure supercapacitor material is as follows:
[0043] (1) The snowflake-shaped iron oxide nanomaterial prepared in Example 1 is mixed with conductive carbon black and sodium carboxymethyl cellulose in an aqueous solution at a mass ratio of 8:1:1, and evenly coated on foamed nickel. Dry in a vacuum oven at 100° C. for 12 hours to prepare supercapacitor electrodes. Among them, the loading capacity of snowflake-like iron oxide nanomaterials is about 3 mg / cm 2 .
[0044] (2) Select a KOH aqueous solution with a molar concentration of 6M as the electrolyte, Pt as the counter electrode, and a Hg / HgO reference electrode to test the energy storage characteristics of the supercapacitor prepared in step (1). Such as image 3 As shown in (a), the cyclic voltammetry curves of the electrode at different scan rates, it can be clearly seen that when the scan rate increases from 1mV / s to 20mV / s, the shape ...
Embodiment 3
[0046] In this embodiment, the preparation method of snowflake-like iron oxide nanostructure supercapacitor material is as follows:
[0047] Utilize the electrode prepared in Example 2, use the CHI660 electrochemical workstation to carry out the charge and discharge test, wherein all tests are carried out under the condition of three electrodes, the electrolyte is a KOH aqueous solution with a molar concentration of 6M, and the discharge curve results are shown in Figure 4 (a). Figure 4 As shown in (b), according to the specific capacitance-current density relationship diagram calculated from the discharge curve, it can be seen that when the charge and discharge current density is 1A / g, the specific capacitance of the electrode can reach up to 809F / g, even if the current density reaches 20A / g, the specific capacitance can still be maintained at 303F / g, showing excellent rate characteristics.
[0048] The results of the examples show that the nano-iron oxide supercapacitor ...
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