Abstract
In this work, a novel Cu decorated Fe_3O_4@ CeOHCO_3 nanocomposite (Cu-Fe_3O_4@CeOHCO_3) has been prepared by a one-step hydrothermal method. Fabricating into the electrode, the electrochemical properties of the prepared materials were characterized by cyclic voltammetry (CV), galvano-static charge-discharge (GCD) test and electrochemical impedance spectroscopy (EIS). The specific capacitance of the Cu-Fe_3O_4@ CeOHCO_3 electrode was 324.7 F g~(-1) at a current density of 1.0 A g~(-1) with a capacitive retention of 88.3% after 1000 charge-discharge cycles. The assembled asymmetric supercapacitor(ASC) device can provide an energy density of 35.4 W h kg~(-1) with a high power density of 781.9 W kg~(-1). DFT calculations prove that the surface modification of Cu functions significantly in modulating the electronic structure and super-capacitive properties of CeOHCO_3. Our self-assembled Cerium-based composite may initiate the suitability for energy storage devices and provides a valuable reference for the fabrication in sodium Ion supercapacitors.
NSTL
Elsevier