A novel binder-free copper oxide@nickel sulfide (CuO@NiS) composite electrode was successfully synthesized on Ni foam via a two-step hydrothermal method for high-performance supercapacitor applications. The hierarchical morphology of the CuO@NiS composite, consisting of CuO microspheres decorated with NiS nanoparticles, offers a large surface area and facilitates electrolyte ion diffusion. The electrode exhibited a high specific capacity of 130.09 mA h g- 1 at 1 A g- 1 and excellent cycling stability with 92.64 % capacity retention after 5000 cycles. A hybrid supercapacitor (HSC) assembled with CuO@NiS and activated carbon (AC) electrodes demonstrated a wide operating voltage of 1.6 V, a maximum energy density of 33.96 W h kg- 1 at 368.69 W kg- 1, and excellent cycling stability of 94.57 % over 5000 cycles. The superior performance of the CuO@NiS composite electrode is attributed to its unique morphology, enhanced electrolyte accessibility, and synergistic interaction between CuO and NiS components. These findings highlight the potential of CuO@NiS as a promising electrode material for high-performance supercapacitors.

Aluminium tris (8-hydroxyquinoline) (Alq3) is a popular coordination complex extensively used in organic luminescent devices as the emissive layer. Metal doping in Alq3 and its nanoscale synthesis are two strategies which are widely adopted to enhance the functional properties of Alq3. In the present work, Cadmium (Cd) doped Alq3 films having 1-dimensional morphology have been successfully synthesised using thermal vapor transport method. These films have been subjected to different analytical studies to study their functional properties. Scanning Electron Microscopy (SEM) images reveal the dendritic nature of Cd-doped Alq3 nanowires while Energy Dispersive X-ray Spectroscopy (EDAX) analysis confirms the presence of Cd in Cd-doped Alq3 nanowires. X-ray Diffraction (XRD) study reveals the polycrystalline nature of Cd-doped Alq3 nanowires. X-ray Photoelectron Spectroscopy (XPS) analysis of Cd-doped Alq3 nanowires samples indicates the replacement of some Al atoms with Cd atoms in Alq3 matrix. UV-visible spectroscopy study of the Cd-doped Alq3 nanowires shows enhancement in the optical absorbance with increasing Cd concentration while Photoluminescence (PL) spectroscopy analysis shows a 7-fold enhancement in PL intensity for 0.5 mol% Cd-doping. This rapid enhancement in the PL is explained on the basis of electronic charge transfer from Cd ions to Alq3 molecules.

Hierarchical binder-free NiCo2O4@CuS composite electrodes have been successfully fabricated on a nickel foam surface using a facile hydrothermal method and directly used as a battery-type electrode material for supercapacitor applications. The surface morphological studies reveal that the composite electrode exhibited porous NiCo2O4 nanograss-like structures with CuS nanostructures. The surface area of the composite is significantly enhanced (91.38 m2 g-1) compared to NiCo2O4 (52.16 m2 g-1), with a predominant pore size of 3-6 nm. This synergistic combination enhanced the electrode's electrochemical properties. The NiCo2O4@CuS electrode delivered an impressive specific capacitance of 141.13 mA h g-1 at 1 A g-1, surpassing the performance of the bare NiCo2O4 electrode. The composite electrode also exhibited excellent rate capability and cycling stability, retaining 87.49% of its initial capacity at high current densities and 88.62% after 3000 cycles. A hybrid supercapacitor (HSC) device assembled using NiCo2O4@CuS and G-ink electrodes attained a peak energy density of 28.85 W h kg-1 at a power density of 238.2 W kg-1, outperforming many reported HSCs. Additionally, the HSC device demonstrated exceptional cycling stability, retaining 87.59% of its initial capacitance after 4000 cycles. The superior performance of the NiCo2O4@CuS composite electrode is attributed to the synergistic combination of NiCo2O4 and CuS, which promotes interfacial electron separation and facilitates rapid electron transfer.

Nano-sized CoMoO has emerged as a gifted contender for renewable energy conversion storage applications. However, the limited stability and unique surface areas of oxide-based materials present challenges in the use of supercapacitors (SCs). In this work, we employed a facile hydrothermal method to hierarchically fabricate nanoflakes-rod-like CoMoO-S materials on nickel foam (NF). The resulting electrodes exhibited remarkable electrochemical activity, attributed to the synergistic properties of the well-allied CoMoO 2D nanorods. Notably, the developed CoMoO-S nanoflakes-rod (3D-2D) composites proved an excellent specific capacitance of 1087 F g-1 at 2 A/g current density, along with excellent rate capabilities surpassing those of single CoMoO nanorods electrodes. Furthermore, the CoMoO-S nanoflakes-rod composites exhibited notable cyclic stability, with a retention rate of 86.3 % above 5000 cycles. The exceptional electrochemical characteristics displayed by electrode materials typically used in batteries provide a hopeful strategy for the advancement of high-performance supercapacitors.

Amid the energy crisis, intensive research is underway to develop advanced energy storage devices, vital for diverse applications. These solutions bolster productivity, portability, and grid stability, fostering a transition toward a sustainable energy landscape across consumer and industrial sectors. This study focuses on the synthesis of NiFe2O4//CoFe2O4 nanosheets composites for high-performance supercapacitor electrodes, utilizing recent advancements in materials science. Employing a simple hydrothermal process, we successfully fabricated nanosheets composite materials in a step-by-step manner for the first time. The resulting nanohybrid underwent comprehensive physicochemical characterizations, including X-ray diffraction, nitrogen adsorption-desorption, X-ray photoelectron spectrometer, High-resolution transmission electron microscopy, and Field Emission Scanning Electron Microscopy analyses, elucidating its morphology, structure, and chemical composition. Our unique electrode material exhibited an impressive specific capacitance of 800 Fg-1 at a current density of 2 Ag-1 in a potassium hydroxide electrolyte with the surface area 75 m2/g. Furthermore, it demonstrated excellent cycling stability, retaining 85.9 % capacitance after 10,000 cycles at a current density of 1 Ag-1, with low chargetransfer resistance and exceptional rate capability. The distinctive heterostructure entities, abundant electroactive sites, and synergistic interfacial interactions contributed to its superior electrochemical energy storage properties. Insights into the plausible electrochemical reactions underlying the working mechanism of these nanosheets materials are provided. Overall, our findings underscore the potential of NiFe2O4//CoFe2O4 nanosheets as electrode materials for efficient energy storage applications.

Energy storage technologies are essential for meeting the rising need for effective and environmentally friendly energy storage solutions. Due to their high-power density and quick charge/discharge characteristics, supercapacitors have drawn a lot of interest as potential candidates for a range of energy storage applications. The growing field of research that blends 2D MXenes with metal-organic frameworks (2D MOFs) to create superior supercapacitor materials for energy storage applications is described in this abstract. The family of porous materials known as MOFs is distinguished by its large surface area, adjustable architectures, and variety of chemical compositions. However, 2D MXenes, produced from layered transition metal carbides and nitrides, exhibit outstanding mechanical and electrical conductivity. The combination of these two different materials has a lot of potential to improve supercapacitor performance. The synthesis processes, structural traits, and effects on the supercapacitor performance of MOF-MXene composite materials will all be covered in this abstract. Improved charge storage capacity, quicker ion diffusion kinetics, and increased long-term stability are made possible by the synergy of MOFs and 2D MXenes, which solves some of the major problems with conventional supercapacitor materials. We will also talk about the possible uses of MOF-MXene supercapacitors in a variety of industries, including electric cars, portable electronics, and renewable energy systems. They provide a potential alternative for addressing the constantly growing energy storage needs of contemporary civilization because of their capacity to supply high energy and power densities while preserving lengthy cycle lives.

Nickel molybdate oxide (NiMoO4) and tungsten trioxide (WO3) are becoming progressively more commonly suitable as electrode materials for supercapacitors owing to their chemical stability, peculiar layered structure, and significant capacitance. Unfortunately, most of the published works based on NiMoO4 and WO3-based electrodes show lower electrochemical performance due to their poor conductivity and fast capacitance fading. Here, we reveal methods to build hierarchical nanoflowers formed from NiMoO4/WO3/NF for the very first time, which enhances the supercapacitor's electrochemical performance. The potential benefits of the NiMoO4/WO3/ NF suitable to be a binder-free electrode material for supercapacitor utilization seem very fascinating. In com-parison to the pristine NiMoO4/NF (263.75 F g-1) and WO3/NF (197.91 F g-1) materials, the NiMoO4/WO3/NF nanocomposite exhibits remarkable precise capacitance of 429.46 F g-1 at 1 A g-1, exceptional reliability alongside over 89.9 % the capacitance preservation after 10000 cycles, and low charge transfer resistance. NiMoO4/WO3/NF nanocomposite exhibits outstanding electrochemical performance and is mainly allocated to the beneficial synergistic effect of its peculiar structure, which may offer additional routes for the movement of electrons and maximize the efficiency of the utilization of the electrode material. The findings imply that these kinds of nanocomposite electrodes have a lot of promise for application in energy storage.

High-performance electrochemical supercapacitors are highly needed to meet the fast-growing needs of the electronics industry. However, achieving the ideal electrochemical performance of asymmetric supercapacitors (ASC) devices are impacted by the poor specific capacitance, restrained rate capability, and inferior cycling stability of both anode and cathode materials. Herein, we have reported ASC device completely based on highly electroactive pseudocapacitive electrode materials. Novel zero dimensional (0D) copper-iron-phosphate (Cu3Fe4(PO4)(6)) nanoparticles are synthesized through a facile hydrothermal method and have been deployed as an anode material. Moreover, zinc molybdenum oxide (ZnMoO4) nanorods with unique triangular morphology have been utilized as a cathode material. The Cu3Fe4(PO4)(6) electrode exhibits a high specific capacitances of 996.8 F g(-1) at 2 A g(-1), whereas the ZnMoO4 electrode achieves a maximum specific capacitance of 1113.7 F g(-1) at the same current density. In the existence of reported electrode materials, Cu3Fe4(PO4)(6)//ZnMoO4 asymmetric supercapacitor device displays an outstanding energy density of 39.1 Wh kg(-1) at a power density of 657.31 W kg(-1). The as-constructed ASC device consists of 0D Cu3Fe4(PO4)(6) nanoparticles and ZnMoO4 triangular nanorods has shown enriched electrochemical potential for the development of sustainable energy storage systems.

Zinc batteries offer distinct advantages owing to their notable safety profile, cost-effectiveness, and environmental friendliness. The zinc anode, in particular, stands out as a promising material for aqueous zinc batteries due to its array of benefits, including its lower potential, favorable cost, higher specific capacity, increased potential for hydrogen release, non-reactive properties, natural abundance, and ease of processing. However, the uncontrolled growth of zinc dendrites, electrolyte-induced damage, significant volume changes, and unstable interfaces have thus far impeded their commercial viability, posing obstacles to their further advancement. Recent efforts have focused on addressing these challenges through the utilization of structures derived from metals and their derivatives, resulting in significant progress regarding zinc anode issues. Strategies such as stabilization through metal-organic frameworks (MOFs) and their derivatives, solid-state electrolyte development, anode decoration, separator enhancement, and interface engineering have shown promise in stabilizing zinc anodes. The incorporation of these advancements could greatly benefit large-scale energy storage systems, capitalizing on zinc batteries' exceptional safety, high capacity, affordability, and sustainability. Moreover, the unique properties of MOFs, including their ability to facilitate zinc ion transportation, large specific surface area, and highly porous topology, have garnered increased attention for their application in zinc ion batteries. This review aims to comprehensively explore the structural components of zinc batteries based on previous research contributions, encompassing pure metal structures, metal oxides, porous carbon materials, and their compounds. In particular, the review delves into the utilization of MOFs-based materials as interfaces for solid electrolytes, separators, three-dimensional zinc architectures, and solid-state electrolytes to enhance the cyclic stability of zinc anodes. Additionally, it examines the role of conductive MOFs across various categories of zinc-based batteries, highlighting their functionality, efficacy, and existing challenges. Finally, the review offers insights into the potential future advancements in this field, outlining the prospects for further harnessing the capabilities of conductive MOFs.

The shape/morphology of materials is critical for energy storage, especially in supercapacitors, as it affects their efficiency. The unique Rambutan-shaped CuNiO2 material shows promise for supercapacitors due to its tailored properties. This study stands out for synthesizing the Rambutan-like CuNiO2 structure, further improved by adding Mn, which changes its composition. Using a single-step hydrothermal technique, Mn-doped CuNiO2 (Mn-CuNiO2) is successfully made, with X-ray diffraction (XRD) used to identify phases. High-Resolution Transmission Electron Microscopy (HRTEM) reveals the detailed hexagonal-like architecture of Mn-CuNiO2, shedding light on its nano structural attributes. Brunauer-Emmett-Teller (BET) analysis adds insights into the material's surface characteristics. The electrochemical performance of the Mn-CuNiO2 electrode is thoroughly examined through galvanostatic charge/discharge experiments and cyclic voltammetry, demonstrating its high specific capacitance. Remarkably, the electrode shows a specific capacitance of 1870 F/g at a current density of 1 A/g, highlighting its effectiveness in energy storage. Additionally, the electrode material displays commendable cyclic stability, maintaining superior performance over 10,000 cycles. This durability emphasizes the importance of improving electrode materials to enhance the efficiency and lifespan of supercapacitors, meeting the growing demand for sustainable energy storage solutions.

The advancement in carbon derivatives has significantly boosted the efficacy of recently produced electrodes designed for energy storage applications. Utilizing the hydrothermal technique, conductive single and composite electrodes comprising GO/Co3O4/NiO were synthesized and utilized in supercapacitors within three-electrode systems. The GO/Co3O4/NiO composite electrode demonstrated better rate capability and excellent long-term reliability, as well as a noteworthy energy density at comparatively large power levels. The GO/Co3O4/NiO hybrid electrode had an ideal capacitance of 986.5 F/g at an applied current density of 1 A/g, according to the data. Furthermore, after 5,000 cycles, this composite electrode displayed an outstanding cycling stability of 90.4%. The results indicate that the combined electrode surpasses individual metallic oxide electrodes, with the addition of graphene oxide contributing to the improved performance. When the efficiency of the three samples was evaluated, it was clear that this GO/Co3O4/NiO electrode outperformed the GO/Co3O4 and GO/NiO electrodes. This improvement can be due to the composite electrode's synergistically impact from Co3O4, NiO, and GO.

We synthesized Ag-doped CeO2/ZnO nanocomposites by means of a ethanolic dispersion technique. Several methodologies for characterization were applied to the study of these nanocomposites, such as transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), UV–visible absorption spectroscopy, and photoluminescence spectroscopy. The composite sample was found to contain wurtzite and cubic phases of ZnO and CeO2, respectively, according to the XRD examination. A strong bond between CeO2 and ZnO within the nanocomposite was demonstrated by the SEM and TEM investigations. Moreover, it was discovered that the addition of Ag and the coupling of CeO2 caused a red-shift and moved ZnO absorption edge from the UV to the visible spectrum. Consequently, the bandgap was reduced from 3.08 eV to 2.69 eV, and the absorbance band intensity increased in the visible region. Utilizing visible light, 15 O_2^∙ - and HO^∙ radicals, with HO^∙ radicals identified as the primary species in the photocatalytic breakdown of MB. Ag-doped CeO2/ZnO nanocomposites, featuring metal ion doping, displayed notable improvements in photodegradation activity, making them well suited for the effective removal of hazardous dyes present in textile effluents.

The applications of liquid crystals in the field of renewable, clean and sustainable technologies of energy storage are of utmost importance at present. This paper delves into dielectric spectroscopic studies of a weakly polar nematic liquid crystal (NLC) enriched with an anthraquinone dye. The primary objective is to assess the impact of increasing dye concentrations on various properties. Anthraquinone dye has been found to increase the dielectric permittivity of weakly polar NLC, leading to a 4.7-fold increase in dielectric anisotropy. Simultaneously, a reduction of around 11% in threshold and operating voltages of the NLC has also been recorded after using dye as the guest material. The added dipolar contributions provided by dye molecules have been attributed to this surplus permittivity. The NLC has been found to have an approximately 54% faster response to the applied field. The intrinsic polarization field of dye molecules accelerates nearby LC molecule reorientation, leading to a 56.5% faster fall time and a 29.8% faster rise time in a 3.0 wt% dye-doped LC cell. These experimental results have been validated via computational studies as well. The simulation results about dipole moment and polarizability provide robust support for our experimental results. Such composites evince their potential for energy storage and 5G communication technologies with adjustable impedance and permittivity.

New electronic and optoelectronic devices are proliferating all over the world right now, necessitating the development of more dependable power sources with better energy densities and longer lifespans. Supercapacitors now rank among the excellent energy-storage technologies due to their numerous benefits, including high power, quick charging and discharging, and prolonged cyclic stability. Researchers are now looking into new kinds of supercapacitors with higher performance because existing supercapacitors' extremely low energy density significantly restricts their vast range of applications. A wide operational voltage window is a particular benefit of asymmetric supercapacitors (ASCs) built with two different electrode materials, which considerably improves energy density. A detailed examination of the materials created for ASC electrodes, as well as the advancements made in the fabrication of ASC devices over the past few decades, are covered in this critical analysis of recent developments in the field of ASCs. Furthermore covered are current difficulties and the field of ASCs' prospects for the future.

Novel structured Na-doped MoS2 nanosheets were developed in situ on Ni foam through a more accessible two-step hydrothermal technique. Benefiting from the synergistic reactions of the superior capacitance of Na-doped MoS2 nanosheet, the superior electrical kinetics of Na-doped, and the porous nanostructure of the composites, the designed Na-doped MoS2 nanosheet composites electrode achieves notable electrochemical activity. The material’s structural properties investigate using an X-ray photoelectron spectroscope analyzer, X-ray powder diffractions, scanning electron microscope, and transmission electron microscope. The electrochemical activity of the designed electrodes was executed using cyclic voltammograms, galvanostatic charge/discharges, and electrochemical impedance spectroscopy. Compared to the pure MoS2 electrode, the novel architecture Na-doped MoS2 nanosheet deremonstrates a higher specific capacity of 374.3 C g−1 at 1 A g−1. In addition, it achieves notable cycling stability performance and retains 87.4

Here, we describe the successful hydrothermal synthesis of zinc cobalt sulfide (ZCS) and reduced graphene oxide/zinc cobalt sulfide (rZCS) nanoparticles (NPs). X-Ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Xray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (TEM) characterizations were used to test ZCS and rZCS NPs. Through the use of cyclic voltammetry (CV), galvanostatic charge and discharge (GCD), and electrochemical impedance (EIS), the electrochemical performance of the produced materials was examined. Electrochemical hydrogen evolution reactions and supercapacitor applications required the development of ZCS and rZCS electrodes. 10 mA cm-2 is driven by rZCS electrodes at 132 mV HER overpotential. High specific capacitance of 891 F g-1 at 1 A g-1 current density and 99 % cyclic stability are displayed by the rZCS electrode even after 5000 cycles. The specific capacitance of (181 F g-1 at 1 A g-1 current density), capacitance retention of (92 % after 10,000 cycles at 1 A g- 1 asymmetric supercapacitors made from cells using rZCS and rGO. Given this, the produced electrodes material holds potential for use in energy storage technologies. , and energy and power density of (29 Wh kg- 1 and 2215 W kg 1), respectively, are recommended for

Currently, two-dimensional designs were enthralled much consideration because of their good electrochemical abilities. Herein, cactus-like designs of Ni-Co/CoMn2O4 composites have been synthesized by simple hydrothermal techniques on Ni foam. The novel construction possessing Ni-Co and CoMn2O4 nanomaterials demonstrates excellent electrochemical properties. As data values, the unique design and porous structures display vitally developed electrochemical capacitance activities which include outstanding specific capacitances, reasonable life cycles, and good rate capabilities. The specific capacitance of the Ni-Co/CoMn2O4 composites exhibits 1567F/g at a current density of 0.5 A/g, and it is two-fold superior to the binary Ni-Co nanoparticles and CoMn2O4 nanomaterials electrodes. Else, the proposed Ni-Co/CoMn2O4 composite exhibits excellent long cycles by 95.87% retaining of its initial capacitances after 5000 cyclings. This cactus-like Ni-Co/CoMn2O4 composite refers to the new opportunity to investigate higher-performance sample materials and has great application prospects.

ZnO nanomaterials doped with Fe3+ ions at concentrations ranging from 1% to 7% were synthesized using an environmentally friendly combustion technique. These materials were then analyzed using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and UV-Visible diffuse reflectance spectroscopy (UV-Visible DRS). The resulting crystallite size was determined to be between 20 nm and 25 nm. By applying the Kubelka-Munk function, the band gap was calculated and found to vary from 2.55 eV to 2.99 eV. For the investigation of electrochemical properties, modified carbon paste electrodes containing ZnO: Fe3+ (1-7 mol%) were subjected to cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Notably, the ZnO: Fe3+ (1 mol%) electrode demonstrated promising characteristics for supercapacitor applications. This same electrode was also utilized for detecting paracetamol and glucose at concentrations ranging from 1 mM to 5 mM using CV and chronoamperometry techniques, underscoring its potential as an electrochemical sensor. Moreover, the photocatalytic capability of ZnO: Fe3+ (1 mol%) nanomaterial was assessed through the degradation of methylene blue and acid orange-8 dyes. The results were impressive, with this particular photocatalyst achieving 94.45% degradation of methylene blue and 96.29 % degradation of acid orange-8 dye. These outcomes validate its efficacy for applications in photocatalytic dye degradation. In conclusion, the ZnO: Fe3+ (1 mol%) nanomaterial synthesized via environmentally friendly means exhibits substantial promise for diverse applications in electrochemical and photocatalytic domains.

Covalent organic frameworks are a type of crystalline porous materials that have recently been discovered. They are formed by covalent bonding and can have various molecular structures. Covalent organic frameworks can be synthesized using different methods and have gained significant attention in scientific research. They are now recognized as essential materials in technology due to their unique advantages. These advantages include their large surface area and porosity, high modifiability, presence of conjugated structures, availability of sufficient building blocks, low density, and high chemical stability. Covalent organic frameworks possess these properties because of the efficient linking of atoms in two and three dimensions, which allows for the construction of extended framework structures. Covalent bonds hold the molecules together and connect them to larger covalent structures. One particular area of interest is the development of energy storage devices. Covalent organic frameworks show promising capacitive response and the potential for high capacitance. Their capacitive behavior has attracted significant attention, especially regarding the various morphologies that can be achieved through different synthetic processes. However, the main challenge hindering the widespread use of covalent organic frameworks in electrochemical energy storage systems is their low specific capacitance and poor electrochemical performance, primarily due to their limited electrical conductivity. Efforts have been made to enhance the performance of covalent organic framework -based -materials by incorporating redox-active groups into the covalent organic framework skeleton, controlling morphology and hydrogen bonding, and creating hybrid systems with conducting polymers, carbon materials, chalcogenides, metal oxides, and other materials. Additionally, research has focused on developing advanced nanocomposites, such as binary, ternary, and quaternary systems, for cutting-edge energy storage applications. These endeavors aim to maximize the positive effects of covalent organic frameworks while minimizing their limitations. This review article provides a concise introduction to covalent organic frameworks, discusses the advantages and disadvantages of using covalent organic frameworks in supercapacitors, and gives a brief overview of the technology. It then delves into the latest advancements in covalent organic framework design and its composites. Furthermore, it examines the fundamental principles and strategies employed in this field to improve the performance of covalent organic frameworks-based materials in energy storage applications.

In this study, we designed mixed metal oxides with doping compound nano-constructions as efficient electrode materials for supercapacitors (SCs). We successfully prepared the Fe-dopant with NiCoOx grown on nickel foam (Fe-dopant@NiCoOx@NF) through a simple hydrothermal route with annealing procedures. This method provides an easy route for the preparation of high activity SCs for energy storage. Obtained results revealed that the Fe dopant has successfully assisted NiCoOx lattices. The electrochemical properties were investigated in a three-electrode configuration. As a composite electrode for SC characteristics, the Fe-dopant@NiCoOx@NF exhibits notable electrochemical performances with very high specific capacitances of 1965 F g−1 at the current density of 0.5 A g−1, and even higher at 1296 F g−1 and 30 A g−1, respectively, which indicate eminent and greater potential for SCs. Moreover, the Fe-dopant@NiCoOx@NF nanoneedle composite obtains outstanding cycling performances of 95.9% retention over 4500 long cycles. The improved SC activities of Fe-dopant@NiCoOx@NF nanoneedles might be ascribed to the synergistic reactions of the ternary mixed metals, Fe-dopant, and the ordered nanosheets grown on NF. Thus, the Fe-dopant@NiCoOx@NF nanoneedle composite with unique properties could lead to promising SC performance.