Preparation method of asymmetric supercapacitor based on prussian blue analog/reduced graphene thin film

Abstract

The invention discloses a preparation method of an asymmetric supercapacitor based on a prussian blue analog/reduced graphene thin film. The preparation method comprises the following steps of preparing graphene oxide on the basis of a Hummers method, preparing reduced graphene, preparing prussian blue analog with different central metal atoms, and preparing a reduced graphene dispersion liquid and a prussian blue analog dispersion liquid; adopting a vacuum suction filtration method for preparing a composite thin film with the reduced graphene and prussian blue analog with a layer-by-layer stacking structure; and finally, by taking the prepared reduced graphene and prussian blue analog composite thin film as positive and negative materials, preparing the asymmetric supercapacitor. The prepared prussian blue analog/graphene composite material thin film prepared by the method has the layer-by-layer stacking structure, so that the problem that a graphene-based electrode is easily stackedin the preparation process is solved; the advantages of graphene and prussian blue analog are combined, so that a better synergistic effect can be generated; and meanwhile, the preparation method is simple and low in cost.

Description

technical field [0001] The invention relates to the technical field of manufacturing supercapacitors, in particular to a method for preparing an asymmetric supercapacitor based on a Prussian blue / reduced graphene film. Background technique [0002] Supercapacitor is one of the most promising electrochemical energy storage technologies at present, also known as Electrochemical Capacitor (Electrochemical Capacitor), is a new type of energy storage device that mainly relies on electric double layer capacitance and redox capacitance for charge storage. It has the characteristics of fast charging and discharging, showing ultra-high power density, and its capacity can reach hundreds or even thousands of farads. [0003] Graphene is made of carbon atoms with sp 2 A new type of two-dimensional atomic crystal composed of hybridized monoatomic layers is a honeycomb hexagonal planar crystal with a thickness of only 0.3354nm, which is the thinnest material found in the world so far. G...

AI Technical Summary

Problems solved by technology

Although Prussian blue-like has a rich pore structure and high electrochemical activity, because of its low conductivity, the transport of carriers is limited.

[0005] Therefore, those skilled in the art are committed to developing a method for preparing an asymmetric supercapacitor based on a Prussian blue / reduced graphene film, and prepare a Prussian blue / graphene composite film with a layer-by-layer stacking structure to solve the problem. It solves the problem that graphene-based electrodes are prone to stacking during the preparation process, and combines the advantages of graphene and Prussian blue-like materials to make them produce better synergistic effects; at the same time, the preparation method is simple and low-cost

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