CNT 2 Capacitance 2 Double-layer capacitance 2 Electrochemical electrodes 2 GNF Supercapacitor electrodes 2 Carbon nanotubes 1 Cyclic voltammetry 1 Electrochemical 1 Electrochemical characterizations 1 Electrochemical measurements 1 Electron microscopy 1 Field emission microscopes 1 Field emission scanning electron microscopy 1 Good capacity retentions 1 Hematite 1 High resolution transmission electron microscopy 1 Hydrothermal routes 1 Iron oxide 1 Iron oxides 1 Nanofibers 1 Nanotubes 1 Physico-chemical characterization 1 Physicochemical 1 Scanning electron microscopy 1 Specific capacitance 1 Super capacitor 1 Supercapacitor 1 Supercapacitors 1 Transmission electron microscopy 1