▎ 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]