▎ 摘　　要

Well-graphitized carbon nano onions anchored on graphene sheets were synthesized via a simple, inexpensive, and environmentally-friendly bottom-up approach. For this purpose, a one-step hydrothermal synthesis method is employed, selecting glycerol/glucose mixture as easily accessible smart organic precursors. To characterize the fabricated composite, different techniques including FTIR, RAMAN, FESEM, HRTEM, XRD, and AFM were used. As a highly favorable application of carbon nano onions arising from their excellent surface area, the supercapacitance characteristics of the synthesized pillared composite were investigated utilizing an asymmetric carbon nano onions composite/carbon paste electrode. The electrochemical characteristics of the described electrode, evaluated by cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic cycling measurements, revealed good ionic transfer capability due to its unique architecture. These electrode materials, despite having poor conductivity, dielectric behavior, and inactivity through the charge/discharge process, still have high-energy storage performances because of the permeability of the electrolyte through the pillared architected composite, along with providing more polarization pathways. The resulting electrochemical capacitor succeeds elevated areal capacitance as 14.5 mF cm(-2) from cyclic voltammetry and 13.90 mF cm(-2) from galvanostatic charge/discharge measurements. The modified electrode also exhibits an energy density of 0.44 mu Wh cm(-2) at a power density of 15.08 mW cm(-2).