Three-dimensional lion's mane like AlV3O9 deposited on graphene surface for supercapacitors with a promising electrochemical performance

• Main Authors: Low, Wei Hau, Lim, Siew Shee, Chia, Chin Hua, Siong, Chiu Wee, Khiew, Poi Sim
• Format: Article
• Language: English
• Published: H. : ĐHQGHN 2020
• Subjects: Graphene; Graphene/AlV3O9; Solvothermal; Supercapacitor
• Online Access: http://repository.vnu.edu.vn/handle/VNU_123/89319; https://doi.org/10.1016/j.jsamd.2020.05.003
• Institution: Vietnam National University, Hanoi

3D lion's mane like AlV3O9 microspheres deposited on the well-exfoliated graphene were successfully synthesised through a facile solvothermal method where the graphene sheet was prepared solely via the liquid phase exfoliation process. The highly electrical conductive graphene was introduced as a conductive substrate or a backbone to support the diffusion of the electrolyte ions (OH ). In order to achieve the optimum electrochemical performance, graphene/AlV3O9 nanocomposites with different weight ratios were fabricated wherein G-5AlV possessed an exceptional charge storage ability which surpasses that of other nanocomposites. The G-5AlV sample was found to possess a magnificent specific capacitance of 551.72 F∙g 1 at 0.5 A∙g 1 and achieve a remaining capacitance of 468.97 F∙g 1 as the current density was increased. After 5000 continuous intercalation/de-intercalation processes, G-5AlV delivered a specific capacitance of 441.38 F∙g 1 and a coulombic efficiency of 95%, confirming its remarkable cycling stability and coulombic efficiency. More importantly, it exhibits good energy and power densities as a symmetric supercapacitor, further suggesting itself as a potential candidate for use in high-performance charge storage devices.