Study on modification and electrochemical performance of graphene/nickel matrix composite

• Published in: Journal of materials science. Materials in electronics Vol. 33; no. 7; pp. 4081 - 4092
• Main Authors: Liu, Xuyan, Xie, Jihui
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2022; Springer Nature B.V
• Subjects: Capacitance; Capacitors; Characterization and Evaluation of Materials; Chemistry and Materials Science; Clean energy; Composite materials; Electrochemical analysis; Energy conversion; Graphene; Materials Science; Metal matrix composites; Nickel compounds; Optical and Electronic Materials
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-07602-x

With the ever-increasing energy problem, people are paying more and more attention to green and safe energy. The preparation of a single electric double-layer capacitor or pseudocapacitance characteristic material into a composite material will improve the disadvantages of a single capacitor. In addition, Co doping is considered to be an effective method to improve material conductivity and energy conversion. In this paper, based on nickel hydroxide (Ni(OH) 2 ) and reduced graphene oxide (RGO), Ni(OH) 2 /RGO and Co-doped Ni(OH) 2 /RGO were prepared by a one-step hydrothermal synthesis method. Their electrochemical performance and practicality have been studied. It is found that the Co-doped Ni(OH) 2 /RGO nanosheets have an initial specific capacitance of 2006 F g −1 at a current density of 1 A g −1 and a retention rate of 80.60% after 1000 cycles. Compared with Ni(OH) 2 /RGO composite material, it has been greatly improved. It shows that the addition of Co element has greatly improved the specific capacitance of the material, which provides a new idea for the future research of nickel-based electric double-layer capacitor materials.