Preparation and Electrochemical Properties of Nickel Hydroxide/Reduced Graphene Oxide Composites

Abstract

Abstract: Ni(OH)₂/RGO composite electrode materials were prepared from nickel nitrate and graphene oxide by one-step hydrothermal reduction using porous nickel foam as substrate, urea as precipitant and hexadecyl trimethyl ammonium bromide (CTAB) as dispersant. The morphology and structure of Ni(OH)₂/RGO electrode materials were characterized, and the electrochemical properties of the materials were investigated by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) tests. The crystal forms of Ni(OH)₂ and Ni(OH)₂/RGO were determined by X-ray diffraction (XRD) analysis. SEM images show that the silky RGO sheets are effectively and uniformly distributed on the surface of Ni(OH)₂ layer. During the hydrothermal process, Ni(OH)₂ sheets grow in situ on the nickel foam, forming a three-dimensional porous multi-layer diversified structure. Compared with pure Ni(OH)₂, the specific capacitance of pure Ni(OH)₂ at 1 A/g is 1 930 F/g and the specific capacitance of Ni(OH)₂/RGO is 2 508 F/g. These results indicate that Ni(OH)₂/RGO is a promising electrode candidate material for supercapacitor.

Key words: reduction of graphene oxide, nickel hydroxide, electrode material, supercapacitor, synergistic effect

CLC Number:

O646

ZHANG Jie. Preparation and Electrochemical Properties of Nickel Hydroxide/Reduced Graphene Oxide Composites[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(5): 915-919.

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