Abstract
Nanocomposite electrodes receive much attention because of their excellent energy storage nature. Electrodes for supercapacitors have come a major source of interest. In this pursuit, the current work elucidates binder-free coral reefs resembling ZnO/CoS2 nanoarchitectures synthesized on the surface of Ni foams employing the cost-effective hydrothermal route. The Zno/CoS2 nanocomposite demonstrated excellent battery-type behavior, which can be employed for supercapcitor application. Various analyses were carried out in the current study, such as X-ray diffraction and high-resolution scanning electron microscopy, which allowed defining the crystalline nature and morphology of surface with ZnO/CoS2 nanoarchitectures. Electrochemical measures such as cyclic voltammetry, galvanostatic charge discharge, and potentiostatic impedance spectroscopy confirmed the battery-type behavior of the material. The synthesized precursors of binder-free ZnO/CoS2 nanostructures depicted an excellent specific capacity of 400.25 C·g−1 at 1 A·g−1, with a predominant cycling capacity of 88. 2% and retention holding of 68% at 10 A·g−1 and 2 A·g−1, even after 4000 cycles, representing an improvement compared to the pristine ZnO and CoS2 electroactive materials. Therefore, the electrochemical and morphological analyses suggest the excellent behavior of the ZnO/CoS2 nanoarchitectures, making them promising for supercapacitors.
Highlights
Energy storage devices such as batteries and supercapacitors are considered the major sources to store electrochemical energy for sustainable energy due to their efficiency and flexibility [1,2,3,4]
SCs can be classified as follows on the basis of the storage process: pseudocapacitors and electrochemical double-layer capacitors (EDLCs) [8,9,10,11,12]
Carbon-derived materials generally suffer from drawbacks such as long ion diffusion length, unregulated pore shape, and dimensions limiting the accumulation of charge in the EDLC, leading to lower storage values
Summary
Energy storage devices such as batteries and supercapacitors are considered the major sources to store electrochemical energy for sustainable energy due to their efficiency and flexibility [1,2,3,4]. There have been various diverse electrode materials fabricated on the basis of their promising features, which can be summarized as metals (Cu), metal oxides (NiO, ZnO, MnO2 , etc.), carbon-derived compounds (single-walled/multiwalled carbon nanotubes, activated carbon, carbon black, bioderived carbon), metal hydroxides (Ni(OH) , Co(OH) , etc.), and various polymeric materials (conducting polymers, MXenes, etc.) [13,14,15] Among these materials, various electrodes demonstrate battery-type behavior, such as Co3 O4 , CoS, ZnCo2 O4 , and CuS, demonstrating enhanced storage behavior when compared to pseudocapacitor materials such as MnO2 and RuO2 because of their structural features, i.e., elemental valences, structural nature, good conductivities, greater capacities, and swift redox cycles. The as-synthesized ZnO/CoS2 nanostructure displayed an excellent specific capacity of 400.25 C·g−1 at 1 A·g−1 , with exceptional cycling stability
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