A core-shell structure fe 2 o 3 Preparation of @ppy composites and their application in supercapacitors
A composite material and core-shell structure technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, manganese oxide/manganese hydroxide, etc., can solve the problems of poor conductivity, poor capacity and rate performance, and achieve uniform size , reduce contact resistance, low cost effect
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[0047] According to the present invention, Fe 2 o 3 The preparation method of @PPy composite material and its application in supercapacitors include the following steps:
[0048] (1) Preparation of ZnO nanorod arrays: use nickel foam as the substrate, soak the nickel foam in potassium permanganate solution for surface treatment, then use zinc nitrate hexahydrate as the zinc source, and use solvothermal in alkaline solution method, directly grow ZnO nano-arrays on nickel foam.
[0049] (2) MnO 2 Preparation of nanotube array: put the ZnO nanoarray prepared in step (1) into a reaction kettle containing potassium permanganate solution, and seal it. React at 120-180°C for 6-12 hours. After the reaction, the sample was taken out and dried. Then soak the sample in KOH solution for 1-4h, take out the sample and dry to obtain MnO 2 array of nanotubes.
[0050] (3) Fe 2 o 3 Preparation of nanotube arrays: Dissolve ferrous sulfate heptahydrate in a mixed solution of water and e...
Embodiment 1
[0059] (1) Preparation of ZnO nanorod arrays: using nickel foam as the substrate, a piece of clean nickel foam was soaked in 0.5 mol / L potassium permanganate solution for 30 min for surface treatment. Add 1.2 mmol of zinc nitrate hexahydrate, 1.2 mmol of hexamethylenetetramine and 3 ml of ammonia water into 80 mL of deionized water and stir for 30 min, then transfer the solution to a 100 mL reaction kettle. The nickel foam was taken out and put into the reaction kettle, and the autoclave was sealed, and reacted at 90°C for 24h. After the reaction, the samples were taken out and dried to obtain ZnO nano-arrays grown directly on the nickel foam. Its microscopic appearance is as figure 1 As shown, the nanorods grow uniformly on the nickel foam.
[0060] (2) MnO 2 Preparation of nanotube array: put the ZnO nanoarray prepared in step (1) into a reaction kettle containing 0.3 mol / L potassium permanganate solution, and seal it. React at 180°C for 12 hours. After the reaction, th...
Embodiment 2
[0065] As described in Example 1, the difference is: in step (4), solution B is slowly added dropwise to solution A, and stirred for 30 minutes. Such as Figure 6 Shown, the Fe that embodiment 2 prepares 2 o 3 @PPy nanotube array at 1mA / cm -2 Under the current density, its area specific capacitance is 330mF / cm -2 .
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