• 文献标题:   Moringa oleifera Leaf Extract Mediated Reduced Graphene Oxide/-Ni(OH)(2) Nanocomposite for Asymmetric Supercapacitors
  • 文献类型:   Article
  • 作  者:   REDDY BJ, VICKRAMAN P, JUSTIN AS
  • 作者关键词:   moringa oleifera, graphene composite, ni oh 2, redox couple, cyclic stability
  • 出版物名称:   BRAZILIAN JOURNAL OF PHYSICS
  • ISSN:   0103-9733 EI 1678-4448
  • 通讯作者地址:   Gandhigram Rural Inst DU
  • 被引频次:   3
  • DOI:   10.1007/s13538-019-00640-1
  • 出版年:   2019

▎ 摘  要

An attempt has been made in preparing graphene composite matrix with Ni(OH)(2) in a green route via Moringa oleifera plant leaf extract in an ordinary co-precipitation method for supercapacitor applications. The as-prepared graphene and its composites with various molar ratios of Ni(OH)(2) are investigated by XRD, UV, Raman, XPS, SEM, and TEM analyses which have confirmed the conversion of graphene oxide into reduced graphene oxide and its complexation with Ni(OH)(2). Electrochemical activity of the samples is examined by using CV, GCD, and EIS techniques in 2M KOH electrolyte solution. The leaf extract-reduced graphene oxide has shown pure EDLC behavior, and its composites with Ni(OH)(2) have contributed good redox couple leading to enhanced electrochemical performance of 350.7Fg(-1) at 0.5Ag(-1). In the two-electrode set-up for asymmetric supercapacitor design, rGO//rGO-Ni(OH)(2) has performed good reversible cyclabilty with the energy density of 34.2Whkg(-1) and power density of 507.5Wkg(-1) at 2Ag(-1). The device shows good cyclic stability for 6000 successive charge/discharge cycles, and therefore, the green option can be one of the best alternatives for advancing supercapacitor technology. [GRAPHICS]