Ni(OH)2/NiO nanoparticle-based fabrication method for graphene nanowall supercapacitor electrode

Abstract

The invention relates to a graphene nanowall supercapacitor electrode and a fabrication method thereof. The graphene nanowall supercapacitor electrode comprises a graphene nanowall array, a current collector and Ni(OH)2 / NiO nanoparticles, wherein the Ni(OH)2 / NiO nanoparticles are adsorbed on a graphene nanowall; and the graphene nanowall vertically grows on the current collector. The Ni(OH)2 / NiO nanoparticles are adsorbed on the graphene nanowall; the graphene nanowall can improve infiltration of the electrode in an electrolyte to a great extent; the Ni(OH)2 / NiO nanoparticles adsorbed on the graphene nanowall are good in dispersity; and the high-dispersity and small-size nanoparticles can improve adsorption of ions in the electrolyte on the Ni(OH)2 / NiO surface. The graphene nanowall and the Ni(OH)2 / NiO nanoparticles achieve the electrode with double electrode layers and pseudocapacitance characteristic; compared with a traditional graphene wall, the graphene nanowall improves the electrical properties by dozens of times; the technological process is simple; the cost is low; and large-scale production can be achieved.

Description

technical field [0001] The invention relates to a Ni(OH)-based 2 Graphene nanowall supercapacitor electrodes, capacitors and a Ni(OH)-based 2 The invention discloses a method for making a graphene nano-wall supercapacitor electrode of NiO nanoparticles, belonging to the technical field of graphene supercapacitor materials. Background technique [0002] Supercapacitor (supercapacitor, ultracapacitor) is one of the most promising electrochemical energy storage technologies. Also known as electrical double layer capacitor (Electrical Doule-Layer Capacitor), electrochemical capacitor (Electrochemcial Capacitor, EC), gold capacitor, farad capacitor, store energy through polarized electrolyte. A supercapacitor can be regarded as two non-reactive porous electrode plates suspended in the electrolyte. When electricity is applied to the plates, the positive plate attracts negative ions in the electrolyte, and the negative plate attracts positive ions, actually forming two capacitive...

AI Technical Summary

Problems solved by technology

However, the structure of the graphene wall prepared by pure plasma chemical vapor deposition is poor, and the distance between the walls is relatively large, so the improvement of the surface area is limited.

In addition, graphene nanowalls without surface modification are extremely hydrophobic, and their applications are limited. They are subsequently used in the process of preparing devices, such as electrodes for supercapacitors, lithium-ion batteries, and nanoparticle modification, liquid ( Such as electrolyte) cannot wet the interior of the graphene wall, resulting in an extremely small effective surface

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