▎ 摘　　要

The development of hybrid materials with high pseudocapacitance and electrical double layer capacitance is an urge for the fabrication of efficient supercapacitor electrodes. Herein, a highly effective, easily performable, high-yielding, and economical method is demonstrated for the preparation of alpha-Fe2O3 nanorods incorporated defect-free graphene nanosheets that showed excellent supercapacitor performance. alpha-Fe2O3/graphene nanocomposite has been synthesized by an interlayer catalytic exfoliation of alpha-Fe2O3 intercalated graphite which showed high conductivity of 3.1 x 10(6) S/cm. alpha-Fe2O3/graphene nanocomposite modified carbon paste electrode exhibited ultrahigh specific capacitance values of 1135 mF/cm(2) at a scan rate of 5 mV/s and 815 mF/cm(2) at a current density of 0.5 mA/cm(2). The fast ionic diffusion with no charge transfer resistance of the electrode material was revealed from the electrochemical impedance spectroscopic analysis. alpha-Fe2O3/graphene nanocomposite showed 100 folds of increase in the specific capacitance compared to alpha-Fe2O3 and graphene, suggesting their synergistic effect in the nanocomposite leading to a drastic increase in the specific capacitance. The composite displayed good cyclic stability of 79.9% retention of the initial capacitance after 1500 cycles and 54.9% after 10,000 repeated cycles. (C) 2021 Elsevier Ltd. All rights reserved.