NiOOH@CuO/Cu2O composite nanosheet array film as well as preparation method and application thereof

Abstract

The invention discloses a NiOOH@CuO / Cu2O composite nanosheet array film as well as a preparation method and application thereof. The method comprises the following steps: growing CuO / Cu2O nanosheet arrays vertical to a substrate and in stagger arrangement on the surface of a high-purity copper material by adopting an anode oxidation technology; performing hydrothermal deposition treatment in an aqueous solution of nickel nitrate; and performing in-situ deposition of a nickel oxide hydroxide nano product on the nanosheet arrays to obtain a NiOOH@CuO / Cu2O nanocomposite. The prepared electrode material gives full play to the electrochemical synergism between the CuO / Cu2O nanosheet arrays and NiOOH, and shows ultrahigh specific capacitance property and good cycling stability while the preparation steps are simple and controllable; and therefore, the electrode material is a super capacitor electrode material with practical application value.

Description

technical field [0001] The invention relates to a NiOOH@CuO / Cu 2 The invention discloses an O composite nanosheet array thin film, a preparation method and an application thereof, and belongs to the field of nanomaterials and electrochemical energy storage thereof. Background technique [0002] As a new type of electrochemical energy storage device, supercapacitor has advantages that other batteries do not have at present, such as short charging time, long cycle life, good temperature characteristics, can provide ultra-large current power and is relatively environmentally friendly, etc., has become the current research topic. One of the hot spots. Among them, the electrode material is the key factor that determines the performance and production cost of supercapacitors, and is also the core and focus of research. Metal oxides, as supercapacitor electrode materials, can make full use of the highly reversible redox reaction between the active material on the surface of the e...

AI Technical Summary

Problems solved by technology

Its charging / discharging process can be summarized as a redox reaction between Cu(II) and Cu(I), but the capacitive performance of copper oxide alone is not ideal, improving the charge transport and mass exchange characteristics of electrode materials, synthesizing innovative Nanocomposites are considered to be an effective route, such as the reported C / CuO nanocomposites, Cu 2 O@Cu / / AC three-dimensional nanoneedle array materials have shown better electrochemical performance

[0004] At present, the research on nickel compounds in supercapacitor electrodes is also extensive. There are three main forms of nickel compounds: (1) Nickel oxide (NiO), as one of the functional materials, has good pseudocapacitive behavior, environmental protection, and low cost. The advantages make it a very potential electrochemical capacitor material; (2) Nickel hydroxide has two crystal forms α-Ni(OH) 2 and β-Ni(OH) 2 , has high theoretical capacity, has high development value, and is also one of the current research hotspots; (3) nickel oxyhydroxide (NiOOH) as the active material of zinc-nickel batteries has become a battery material with the development of zinc-nickel batteries A new research hotspot in the field, it has two crystal structures, namely β-NiOOH and γ-NiOOH, the nickel element in γ-NiOOH has a higher oxidation state, so it has a higher discharge capacity than β-NiOOH, but the preparation γ-NiOOH with high electrochemical activity and single-phase structure is difficult

A single copper oxide or nickel compound has not achieved the expected goal as a material for electrochemical capacitors, and has disadvantages such as low specific capacitance, poor cycle reversibility, unstable composition structure, and high cost. Therefore, the synthesis of new composite oxide electrode materials , in order to improve the overall performance of supercapacitors, it is of great significance to achieve a reasonable balance between the comprehensive performance and cost of materials

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