Engineering triangular bimetallic metal-organic-frameworks derived hierarchical zinc-nickel-cobalt oxide nanosheet arrays@reduced graphene oxide-Ni foam as a binder-free electrode for ultra-high rate performance supercapacitors and methanol electro-oxidation.

Battery-type and binder-free MgCo2O4-NWs@NF electrode materials for the assembly of advanced hybrid supercapacitors

From waste to value-added products: Evaluation of activated carbon generated from leather waste for supercapacitor applications

Facile one-step hydrothermal method for NiCo2S4/rGO nanocomposite synthesis for efficient hybrid supercapacitor electrodes

• Ni/carbon nanostructure materials have been synthesized from biomass waste using simple approach. • Synthesis of carbon nanotubes or amorphous carbon nanostructures can be controlled by adjusting the temperature process. • NiO/ porous amorphous carbon nanostructure (PACNS) material delivered specific capacitance of 508 F g −1 at 1 A g −1 . • The NiO/PACNS electrode shows a capacitance retention rate of 78% at 5 A g −1 after 3000 cycles. Herein, nanostructured nickel metal, oxide, and oxyhydroxides have been successfully grown on various types of carbon nanostructures (CNS) via a simple, low cost and eco-friendly route derived from biomass waste materials. Nickel oxide and oxyhydroxide phases could be detected in the roasted precursor materials before pyrolysis as confirmed by X-ray diffraction (XRD) analysis. Transmission electron microscopy (TEM) images showed that these samples were composed mainly of porous amorphous carbon nanostructures. Whereas nickel-metal and nickel oxyhydroxide were the predominant detected phases after pyrolysis in addition to the graphite and carbon phases in the form of carbon nanotubes as confirmed by XRD analysis and TEM investigation, respectively. These composites were explored as potential electrodes for supercapacitor application delivering satisfactory specific capacitance values beside its remarkable charge/discharge reversibility. Among them, the formed porous amorphous carbon nanostructure sample decorated with NiO species displayed the highest capacitive performance. This sample delivered a specific capacitance of 508 F g −1 at 1 A g −1 . Moreover, the cycling stability behavior of this sample at 5 A g −1 delivered 78% of its initial capacity after 3000 GCD cycles. The obtained results suggested that the prepared materials are a promising candidate as electrode material for energy storage applications. 

High-performance electrode materials for supercapacitor applications using Ni-catalyzed carbon nanostructures derived from biomass waste materials

High electrochemical energy-storage performance promoted by SnSe nanorods anchored on rGO nanosheets

Herein, MnS was prepared in situ with Ni3S2 directly on nickel foam to obtain a novel binder-free highly conductive electrode with a superb echinocactus-like morphology. The novel electrode gives ultra-high results when examined as an electrode for supercapacitor applications, such as an areal capacity of 796.7 mA h cm−2 equivalent to an areal capacitance of 2390 F cm−2 at a current density of 3 mA cm−2, in addition to low resistance and a remarkable potential window. Furthermore, a hybrid device using this electrode as a positive electrode and commercial activated carbon as a negative electrode was fabricated to examine the practical aspects of the novel electrode, which conducted a specific energy of 77.5 W h kg−1 at a specific power of 18 000 W kg−1. Interestingly, it preserved a specific energy of 33.3 W h kg−1 at a specific power of 50 000 W kg−1 and a satisfactory capacity retention of 80% after 2000 cycles with a Coulombic efficiency reaching 99%. These results confirm the electrode's superior electrochemical performance as a promising electrode for energy storage applications.

N. S. Tantawy

Papers

High electrochemical energy-storage performance promoted by SnSe nanorods anchored on rGO nanosheets

High specific energy supercapacitor electrode prepared from MnS/Ni3S2 composite grown on nickel foam