Activated carbon nanofibers/aluminium doped-copper manganese ferrite composite nanostructures for electrochemical capacitors

摘要

Herein, the synthesis of activated carbon nanofibers composited with aluminium doped copper manganese ferrite nanoparticles (ACNF/AlxCu(1-x)/2Mn(1-x)/2Fe2O4: x = 0.2, 0.4, 0.6, 0.8) to enhance electrochemical per-formances for electrochemical capacitors was reported. The prepared samples were characterized by mean of xray diffraction (XRD), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller analyzer (BET). The electrochemical properties were tested using cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. By varying 'x', the ACNF/Al0.2Cu0.4Mn0.4Fe2O4 showed highest specific capacitance of 370 Fg(-1) at 2 mVs(-1) and 312 Fg(-1) at 3 Ag-1. The corresponding specific energy of 104 Whkg(-1) and specific power of 2328 Wkg(-1) were observed. The excellent capacitance retention was over 80% after 1000 cycles indicating long term cycling stability of electrode material. The interesting electrochemical properties of aluminium-doped copper manganese ferrite nanostructure makes it a potential candidate for high performance energy storage devices.