Capacitive behaviour of functionalized carbon nanotube/ZnO composites coated on a glassy carbon electrode

Abstract

An efficient and simple method has been developed to synthesize functionalized multiwall carbon nanotube (FCNTs)/ZnO composites which are employed as supercapacitor (SCs) materials. The multiwall carbon nanotubes (MWCNTs) have been oxidised in presence of concentrated HNO 3 at 120 0 C for 2 h to generate oxygenated functional groups on the tubeends along with side walls of FCNTs to enhance their inherent capacitance. The synthesis of FCNTs/ZnO composites have been carried out by solvothermal decomposition of single source precursor (SSP), ZnCl 2 (benzscz) 2 (benzscz = benzaldehyde semicarbazone). FCNT/ZnO composites are well characterized by different techniques viz. X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) etc. FCNT/ZnO/glassy carbon (GC) electrodes are fabricated by deposition of FCNT/ZnO composites on the surface of GC which are further tested for their electrochemical performances by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronopotentiometry. FCNT/ZnO composite electrodes show better reversible charging/discharging ability and higher capacitance values compared to bareFCNTs and ZnO electrodes due to synergistic effect of FCNTs and ZnO. Results show that the composite FZ-1 (FCNT/ZnO (1:1)) displays higher capacitance (157 F/g), maximum energy density (32.15 Wh/kg) and good cycle stability. It retains over 96% of its initial specific capacitance even after 1000 cycles.

Aligned carbon nanotube/zinc oxide nanowire hybrids as high performance electrodes for supercapacitor applications

“…We are conducting such studies and the results will be published subsequently. 57,58 We have also noticed that during repeated electrochemical measurements, assembling the electrochemical cells as well as long cycling their performance does not chance drastically or abruptly. This indicates that robust mechanical structure of the electrodes, specifically needed for electrochemical storage application can be formed using this method.…”

Organic template-assisted green synthesis of CoMoO4 nanomaterials for the investigation of energy storage properties

“…1,6,7,9,20 Thus, the sustainable synthesis of metal oxide nanomaterials with effective functional groups is still a great challenge in the 21 st century. 45,48,51,54,59 In this regard, herein, we developed a sustainable synthesis route to synthesize metal oxide nanostructures (CoMoO 4 ) via an inorganic-organic framework. Euphorbia cognata Boiss has been used as a source of organic compounds for the rst time.…”

All-solid-state asymmetric supercapacitors based on ZnO quantum dots/carbon/CNT and porous N-doped carbon/CNT electrodes derived from a single ZIF-8/CNT template

“…The peak at 285.9 eV is assigned to the C=C bonds of sp2 -carbon. The carbon atoms bonded to carbon-oxygen single bonds (C-O) and carbonyl groups (-C=O) are represented by peaks at 287.3 and 288.7 eV, respectively.…”