A mesoporous znco2o4 nanosheet@nico2o4 nanowire composite material, its preparation method and its application
A technology of composite materials and nanosheets, which is applied in nanomaterial preparation methods and electrochemical cross-application fields, can solve problems such as hindering practical applications, poor conductivity, etc., achieve large specific capacitance, high power density and energy density, and simple preparation process Effect
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Embodiment 1
[0032] A mesoporous ZnCo 2 o 4 Nanosheets @NiCo 2 o 4 A method for preparing a nanowire composite material, comprising the following steps:
[0033] (1) 1mmol ZnSO 4 ·7H 2 O, 2 mmol CoSO 4 ·7H 2 O and 1 mmol tetrabutylammonium bromide were sequentially dissolved in 40 mL deionized water, followed by the addition of 2 mmol NaHCO 3 , and continued stirring for 20 min to obtain solution A. Transfer solution A to a 50mL polytetrafluoroethylene-lined reactor, and pre-treated 2×3cm foam nickel (soaked in 6M dilute hydrochloric acid for 10min to remove the outer layer of oxide film, then rinse with deionized water Cleaning) placed obliquely in the solution, sealed and heated at 180°C for 12h, and naturally cooled to room temperature. The nickel foam covering the sample was washed three times with deionized water and absolute ethanol, and dried in a vacuum oven at 60°C for 6 hours.
[0034] (2) Add 0.1mmol Ni(NO 3 ) 2 ·6H 2 O, 0.2mmol Co(NO 3 ) 2 ·6H 2 O and 0.1 mmol t...
Embodiment 2
[0038] A mesoporous ZnCo 2 o 4 Nanosheets @NiCo 2 o 4 Applications of nanowire composites as electrode materials for asymmetric supercapacitors.
[0039] The specific application method is:
[0040] Mesoporous ZnCo 2 o 4 Nanosheets @NiCo 2 o 4 The nanowire composite material is used as the positive electrode and the activated carbon electrode (AC) is used as the negative electrode to assemble an asymmetric supercapacitor device. Using 3M KOH solution as the electrolyte, the CHI 660D electrochemical workstation is used to measure the cyclic voltammetry curve, constant current charge and discharge, and charge and discharge cycles. . Cyclic voltammetry test at 10, 25, 50 and 100mVs -1 Carried out at different scanning speeds, the voltage range is 0 ~ 1.5V, the results are as follows Figure 5 shown. at 10 to 100mV s -1 There is no obvious distortion in the CV curve in the scan rate range, indicating the fast charge and discharge characteristics of the asymmetric super...
Embodiment 3
[0042] A mesoporous ZnCo 2 o 4 Nanosheets @NiCo 2 o 4 A method for preparing a nanowire composite material, comprising the following steps:
[0043] (1) 1mmol ZnSO 4 ·7H 2 O, 2 mmol CoSO 4 ·7H 2 O and 1 mmol tetrabutylammonium bromide were sequentially dissolved in 40 mL deionized water, followed by the addition of 2 mmol NaHCO 3 , and continued stirring for 28 min to obtain solution A. Transfer solution A to a 50mL polytetrafluoroethylene-lined reactor, and pre-treated 2×3cm foam nickel (soaked in 6M dilute hydrochloric acid for 10min to remove the outer layer of oxide film, then rinse with deionized water Cleaning) placed obliquely in the solution, sealed and heated at 180°C for 10h, and naturally cooled to room temperature. The nickel foam covering the sample was washed three times with deionized water and absolute ethanol, and dried in a vacuum oven at 60°C for 7 hours.
[0044] (2) Add 0.1mmol Ni(NO 3 ) 2 ·6H 2 O, 0.2mmol Co(NO 3 ) 2 ·6H 2O and 0.1 mmol te...
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