High-performance asymmetric supercapacitor based hierarchical NiCo₂O₄@ carbon nanofibers//Activated multichannel carbon nanofibers

Abstract

Synthesis of rational nanostructure design of hybrid materials including uniformly growing, stable and highly porous structures have received a great deal of attention for many energy storage applications. In this study, the positive electrode of the uniform distribution of NiCo 2 O 4 nanorods anchored on carbon nanofibers has been successfully prepared by in-situ growth under the hydrothermal process. Whereas, the activated multichannel carbon nanofibers (AMCNFs) have been fabricated via electrospinning followed by alkaline activation as the negative electrode. The crystal phase, morphological structure for the proposed electrode materials were characterized by x-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Moreover, the electrochemical behaviors were investigated using cyclic voltammetry (CV), galvanostatic charge and discharge (GCD) and electrochemical impedance spectroscopy (EIS) measurements. Compared to the neat CNFs and the pristine NiCo 2 O 4 , the NiCo 2 O 4 @CNFs hybrid electrodes showed better electrochemical performance and achieved a high specific capacitance up to 649 F g −1 at a current density of 3 A g −1 . The optimized NiCo 2 O 4 @CNFs//AMCNFs asymmetric device achieved a high energy density of 38.5 Wh kg −1 with a power density of 1.6 kW kg −1 and possessed excellent recyclability with 93.1% capacitance retention over 6000 charging/discharging cycles. Overall, the proposed study introduces a facile strategy for the robust design of hybrid structured as effective nanomaterials based electrode for high-performance electrochemical supercapacitors.

3D hierarchical core–shell spiny globe shaped Co2P@Ni2P/NiCo2O4@CoO for asymmetric supercapacitors

“…The enhancement of the graphitization degree in CNNCC-NF could contribute to faster electron transfer and efficient charge collection. 40 The peaks at 185, 466, and 668 cm À1 in NCC-NF, corresponding to the characteristic peaks of NiCo 2 O 4 , could be assigned to its F 2g , E 2g , and A 1g phonon modes. 41 The peak located at 504 cm À1 is attributed to the T 2g phonon mode of CoO.…”

Recent Research of NiCo2O4/Carbon Composites for Supercapacitors

“…El-Deen et al [99] deposited NiCo 2 O 4 nanorods on the surface of carbon nanofibers that were obtained by carbonization of electrospun polyacrylonitrile at high temperatures. The hybrid achieved a specific capacitance of 649 F g −1 at 3A g −1 , higher than the 260 F g −1 for pristine NiCo 2 O 4 and 66 F g −1 for carbon nanofibers.…”

Controlled-synthesis of hierarchical NiCo2O4 anchored on carbon nanofibers mat for free-standing and highly-performance supercapacitors

“…The synthesis of NiCo2O4 nanostructures anchored on CNFs mat with different loadings (NiCo2O4@CNFs) ratio were synthesized using a simple hydrothermal method [33]. The reaction vessel is a 100 ml Teflon-lined stainless-steel autoclave reactor containing 75 ml of the reactant solution and the CNFs mat.…”