Nano iron oxide/copper composite material and preparation method and application thereof
A technology of nano-iron oxide and composite materials, which is applied in the field of nano-iron oxide/copper composite materials and its preparation, can solve the problems of poor cycle stability, large capacity loss, and low conductivity, and achieve high specific capacitance and energy density. The effect of simple process and good application prospect
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[0030] Another aspect of the embodiments of the present invention also provides the aforementioned method for preparing the nano-iron oxide / copper composite material, which includes:
[0031] The mixed reaction system including copper source, iron source, acetate and solvent undergoes hydrothermal reaction at 180-200° C. for 15-20 hours to prepare nanometer iron oxide / copper composite material.
[0032] In some more specific embodiments, the preparation method specifically includes:
[0033] Dissolve the copper source and the iron source in the solvent respectively to form a copper source solution and an iron source solution, then mix and stir for 30-60 minutes, then add sodium acetate and mix and continue stirring for 30-60 minutes to form the mixed reaction system.
[0034] Further, the copper source includes any one or a combination of two or more of copper chloride, copper sulfate, copper carbonate, and copper nitrate, but is not limited thereto.
[0035] Further, the iro...
Embodiment 1
[0067] (1) CuCl 2 and FeCl 3 respectively dissolved in 35ml of ethylene glycol solution (molar ratio: CuCl 2 : FeCl 3 =5:1);
[0068] (2) Mix the two solutions obtained in step (1) and continue to stir for 30 minutes;
[0069] (3) Take an appropriate amount of sodium acetate, and add it to the mixed solution obtained in step (2) and continue to stir for 30min;
[0070] (4) the mixed solution obtained in step (3) is loaded into a hydrothermal reaction kettle;
[0071] (5) Put the hydrothermal reaction kettle equipped in step (4) into a blast drying oven, and set the temperature at 200°C for 20 hours;
[0072] (6) Cool the sample obtained in step (5) to room temperature, wash it with distilled water until the filtrate is neutral, and then dry it in an oven at 60° C. for 24 hours to prepare a nano-iron oxide / copper composite material.
[0073] The microscopic morphology of the nano-iron oxide / copper composite material prepared in this example is as follows Figure 1a shown...
Embodiment 2
[0075] The nano-iron oxide / copper composite material (80wt%) prepared in Example 1 is mixed with acetylene black (15wt%) and polytetrafluoroethylene binder (5wt%), and the mixture is spread to a load of about 1.0cm 2 Finally, the working electrode was pressed into a thin sheet at 10 MPa and dried at 100°C for 12 hours to obtain a working electrode for a supercapacitor.
[0076] The electrochemical performance of the materials was evaluated in 6.0 M KOH aqueous electrolyte using an electrochemical workstation (CHI660D, Chenhua, China) with conventional three-electrode (3E) and two-electrode (2E) configurations. In 3E cells, Ag / AgCl was used as the reference electrode and platinum foil was used as the counter electrode. The symmetrical system uses two identical nano-iron oxide / copper composite electrodes as the working electrodes in the 2E battery. CV measurement is from 10 to 100mV·s -1 under different scan rates, such as figure 2 shown; GCD measurements were carried out at...
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