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Synthesis of N-CuMe2Pc nanorods/graphene oxide nanocomposite for symmetric supercapacitor electrode with excellent cyclic stability
摘要： Recent progress in the construction of non-peripheral octamethyl-substituted copper(II) phthalocyanine (N-CuMe2Pc) has opened up new strategies for energy storage applications. Since metal phthalocyanines can deliver excellent redox activities, we have prepared composite based on different ratios of N-CuMe2Pc and graphene oxide (GO) through a simple ultrasound process and evaluated their electrochemical performance for supercapacitor applications. As-prepared composites exhibit superior electrochemical activities as the results of the synergistic effect. A maximum specific capacitance of 291.6 F g?1 is achieved for the G10P2 electrode (Graphene oxide 10 mg and N-CuMe2Pc 2 mg) at 0.5 A g?1 which two times higher than their individual components. Further, the fabricated symmetric device shows that the excellent cyclic stability of about 100.1% over 5000 cycles. The experimental findings ensure the potential application of copper-phthalocyanine/GO composite as an electrode material for the next-generation supercapacitor applications.
关键词： Nanocomposite,Specific capacitance,Cyclic stability,Graphene oxide,Phthalocyanine
更新于2025-09-23 15:23:52
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Incorporating Mn <sup>2+</sup> /Ni <sup>2+</sup> /Cu <sup>2+</sup> /Zn <sup>2+</sup> in the Co <sub/>3</sub> O <sub/>4</sub> Nanorod: To Investigate the Effect of Structural Modification in the Co <sub/>3</sub> O <sub/>4</sub> Nanorod and Its Electrochemical Performance
摘要： The major key component for developing a high-efficiency supercapacitor device is electrode and electrolyte material. This research paper demonstrates the structural modification of Co3O4 nanorod and the electrochemical behavior of Co3O4 nanorod in different aqueous electrolytes such as KOH, PVA/KOH, NaOH, KCl, and Na2SO4. The pseudocapacitive behavior of Co3O4 is varying in the order of KOH > NaOH > PVA/KOH > Na2SO4 > KCl. The storage capability of MCo2O4 (where M = Mn, Ni, Cu, and Zn) nanorods has been compared with Co3O4 nanorod in the KOH electrolyte environment. The material in the form of nanorods is beneficial for an efficient pathway to penetrate an OH- ion into the electroactive material. Among other cobaltite (MCo2O4), NiCo2O4 nanorod exhibits the outstanding capacitance value of 2041.7 F g-1 at a current density of 1 A g-1. NiCo2O4 || NiCo2O4 symmetric supercapacitor system delivers the maximum energy density of 25.42 W h kg-1 at a current density of 0.5 A g-1.
关键词： KOH electrolyte,MCo2O4 nanorod,High specific capacitance,Symmetric device
更新于2025-09-23 15:23:52
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Structural, Dielectric Permittivity and Optical Characteristics of Casting Poly Vinyl Alcohol/Calcium Nickel Aluminate Nanocomposite Films
摘要： Triplex hybrid nanofiller (CaNiAl2O5) have been synthesized by sol-gel method and its nanocomposite (NC) films were incorporated with poly vinyl alcohol (PVA). The scanning electron microscopy (SEM) was used to probe morphological behaviors and dispersion of CaNiAl2O5 in PVA matrix. In order to probe the microstructure X-ray diffraction (XRD) and FTIR were performed on PVA/CaNiAl2O5 NCs. Based on the results of both XRD and transmission electron microscopy (TEM), the average particle size of the CaNiAl2O5 lies in the range 7–15 nm. The current (I) – voltage (V) behaviors were studied using LCR-meter at room temperature. The dc-conductivity increases with increasing in both CaNiAl2O5 at different voltages. The dielectric constant exhibits higher values at lower frequency and increases with nanoparticle (NP) loading due to increase in polarization particles in polymer matrix. The ac conductivity tends to increase with increase frequency and NPs content. The cyclic voltammetric data indicate the NC with 8wt% NPs exhibit higher specific capacitance as compared with PVA. The optical constants of the NCs were evaluated from UV-Visible spectra. The band gap energies has a blue shift from 4.4 eV (PVA) to 2.8 eV (PVA/8wt% CaNiAl2O5), whereas refractive index (RI) and the optical conductivity of NCs increased with an increasing in NPs content.
关键词： CaNiAl2O5,optical properties,dielectric constant,specific capacitance,scherrer length
更新于2025-09-23 15:21:21
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Hydrothermal synthesis of quantum dots dispersed on conjugated polymer as an efficient electrodes for highly stable hybrid supercapacitors
摘要： Hydrothermal synthesis of graphene quantum dots (GQDs) composited with conjugated polymer were investigated the high specific capacitance and cyclic stability of supercapacitor. The situ chemical polymerization method was employed to synthesize the polypyrrole - graphene quantum dots (PPY-GQDs) composite at different concentrations of GQDs. The size, morphology and structural phase of the PPY- GQDs composites was studied by using Transmission Electron Microscope (TEM), Field Emission Scanning Electron Microscope (FESEM), Atomic Force Microscope (AFM) and X-ray diffractometry (XRD) techniques respectively. The optical and electrochemical measurements were carried out by using Ultraviolet-Visible (UV–Vis) Absorption spectroscopy, Photoluminescence Spectroscopy (PL) and electrochemical work station. The cyclic voltammetry (CV) results show enhanced current density and area of CV loop with increasing scan rate and the concentration of GQDs. The Supercapacitor was fabricated by two electrodes owns a high energy density 67.8 Wh/kg and 93 Wh/kg at a power density of 1210 W/kg and 1430 W/kg for PGC1 and PGC3 composites. The highest specific capacitance values 467.32 and 647.54F/g are achieved by PGC1 and PGC3 composite compare to pure PPY. The PPY-GQDs composites achieved excellent cycle stability until the 2000 cycle. Thus, it demonstrates that GQDs is playing a unique and important role in improving the performance of a hybrid supercapacitor device.
关键词： Electrochemical Impedance spectra,Graphene quantum dots,Specific capacitance,Supercapacitors,Polypyrrole
更新于2025-09-23 15:21:01
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Structural, morphological and electrochemical properties of long alkoxy-functionalized polythiophene and TiO2 nanocomposites
摘要： High performance alkoxy-functionalized polythiophene (PM4EOT) and TiO2 nanocomposites were prepared via a facile in situ oxidative chemical polymerization of thiophene monomer. The morphology studied demonstrated that nanocomposites were of the core–shell structure with a particle size of approximately 30 nm and PM4EOT shell was of about 2–10 nm thickness. X-ray photoelectron spectroscopy (XPS) spectra proved that there was a new Ti–S interaction between the polymer and TiO2 surface. The supercapacitive behaviors of the nanocomposites investigated by cyclic voltammetry galvanostatic charge–discharge and AC impedance measurements demonstrated that the prepared PM4EOT/TiO2 nanocomposite [1:1 (weight ratio)] exhibits enhanced specific capacitance and cycling stability as compared to the two pristine components and various ratio contents. The specific capacitance of PM4EOT/TiO2 nanocomposite (1:1) was obtained up to 111 F/g at a current density of 0.5 A/g, which is much higher than that of the pure PM4EOT (45 F/g) and TiO2 (1.6 F/g). In addition, the energy density of 15.4 Wh kg?1 and the power density of 308 W kg?1 delivered by composite (1:1) capacitor were achieved at a current density of 0.5 A/g.
关键词： specific capacitance,TiO2 nanocomposites,supercapacitive behaviors,alkoxy-functionalized polythiophene,energy density
更新于2025-09-23 15:21:01
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Iron Oxide Nanopowders Obtained via Pulsed Laser Ablation, for Supercapacitors
摘要： Nano-sized magnetite powders with addition of iron nitrides were synthesized via pulsed laser ablation (PLA) of an iron target in atmospheric air. A series of iron oxide nanopowders with various phase compositions (ranging from magnetite to hematite) and structures (from 2D lamellas and spherical nanoparticles to continuous 3D structures) were prepared via heat treatment of the initial (as-synthesized) powder at temperatures in the range 200–500°C. The powders were introduced into the composition of carbon paste electrodes (CPEs). The capacitive characteristics of the electrodes prepared were studied in comparison to a commercial electroexplosive iron oxide powder. The capacitances of electrodes were matched to the structural characteristics of the materials and their phase compositions. With the chosen electrode-preparation method, the powder heat-treated at 500°С (sample Fe/500) showed the highest capacitance. The potential of the studied ultrafine materials based on ablative iron oxide was shown for use in electrodes for supercapacitors.
关键词： supercapacitor,specific capacitance,pulsed laser ablation,iron oxides,nanopowder
更新于2025-09-23 15:19:57
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Effect of thermal condensation temperature on electrochemical capacitive properties of g-C3N4 supported on reduced TiO2 nanowires/nanotubes array
摘要： In this work, effect of processing temperature in electrochemical capacitors was investigated for g-C3N4. The g-C3N4 materials (CN) were synthesized by thermal condensation of melamine precursor at different temperature (450, 550 and 650 °C). Then, the g-C3N4 materials were deposited on electrochemically reduced TiO2 nanowires/nanotubes arrays (rTWTA)/Ti substrate. The g-C3N4/rTWTA/Ti electrodes were used as supercapacitor electrodes. Morphology, crystal structure and chemical composition of the g-C3N4/rTWTA/Ti electrodes were studied by FESEM, XRD, FTIR and elemental analysis. Based on galvanostatic charge/discharge measurements, the CN(450)/rTWTA/Ti electrode exhibited the highest specific capacitance up to 22 mF/cm2 at 0.3 mA/cm2 with long cyclic durability at 96.8% capacitance retention after 500 cycle. This effect was attributed to the existence of higher nitrogen content, more active sites, the improved hydrophilicity and three-dimensional morphology of the CN(450)/rTWTA/Ti electrode as compared to the other electrodes. This research introduces the optimum thermal condensation temperature of the melamine for synthesis of the g-C3N4 with great potentials in supercapacitors.
关键词： Supercapacitor,TiO2 nanowires/nanotubes array,Processing temperature,g-C3N4,Specific capacitance
更新于2025-09-19 17:15:36
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Role of metallic dopants on the properties of copper (1) iodide nanopod-like structures
摘要： The addition of impurities as dopants to any material affects the properties of the material where the dopant modulates the optical and structural properties of the material. Copper (1) iodide films which were successfully doped with Al, Pb and Zn (as metallic dopants) were synthesized by the successive ionic layer adsorption and reaction (SILAR) technique while the morphological, structural, optical and electrochemical properties were investigated using the scanning electron microscope (SEM), X-ray diffraction (XRD), UV–Vis spectrophotometer and potentiostat respectively. The SEM image revealed a nanopod-like structure for the deposited CuI films while the XRD results confirmed the crystalline nature of the films with a face centered cubic structure. The optical results showed a progressive decrease of the absorbance values at increasing wavelengths while the optical bandgap energy of the undoped CuI film reduced from 2.47eV to 1.90eV, 1.75eV and 1.8eV for the Al-doped, Pb-doped and Zn-doped CuI films respectively. The undopedCuI film also showed a higher extinction coefficient value than the metallic-doped CuI films. The Zn-doped film had the maximum specific capacitance of 116 F g?1 at 2 mV/s.
关键词： Bandgap energies,Metallic dopants,CuI,SILAR,Specific capacitance
更新于2025-09-19 17:15:36
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A dual-channel optical fiber sensor based on surface plasmon resonance for heavy metal ions detection in contaminated water
摘要： Transition metal phosphides (TMPs) have recently emerged as an important type of electrode material for use in supercapacitors thanks to their intrinsically outstanding specific capacity and high electrical conductivity. Herein, we report the synthesis of bimetallic CoxNi1?xP ultrafine nanocrystals supported on carbon nanofibers (CoxNi1?xP/CNF) and explore their use as positive electrode materials of asymmetric supercapacitors. We find that the Co:Ni ratio has a significant impact on the specific capacitance/capacity of CoxNi1?xP/CNF, and CoxNi1?xP/CNF with an optimal Co:Ni ratio exhibits an extraordinary specific capacitance/capacity of 3514 F g?1/1405.6 C g?1 at a charge/discharge current density of 5 A g?1, which is the highest value for TMP-based electrode materials reported by far. Our density functional theory calculations demonstrate that the significant capacitance/capacity enhancement in CoxNi1?xP/CNF, compared to the monometallic NiP/CNF and CoP/CNF, originates from the enriched density of states near the Fermi level. We further fabricate a flexible solid-state asymmetric supercapacitor using CoxNi1?xP/CNF as positive electrode material, activated carbon as negative electrode material, and a polymer gel as the electrolyte. The supercapacitor shows a specific capacitance/capacity of 118.7 F g?1/166.2 C g?1 at 20 mV s?1, delivers an energy density of 32.2 Wh kg?1 at 3.5 kW kg?1, and demonstrates good capacity retention after 10000 charge/discharge cycles, holding substantial promise for applications in flexible electronic devices.
关键词： cobalt phosphide,high specific capacitance,transition metal phosphide,nickel phosphide,asymmetrical supercapacitor
更新于2025-09-11 14:15:04
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Boosted electrochemical performance of TiO2 decorated RGO/CNT hybrid nanocomposite by UV irradiation
摘要： Titania decorated RGO/CNT hybrid electrode material was prepared for supercapacitor (SCs) application through facile hydrothermal approach. Combined act of 1D CNTs and 2D RGO assists the uniform in-situ growth of titania towards high surface area mesoporous self-assembled interconnected morphology which is confirmed from FESEM and BET surface area analysis. This interconnected porous network like structure can efficiently allow the better mass transport and decreased contact resistance towards high electrochemical utilization. Electrochemical measurements revealed the superior performance of hybrid nanocomposite comprising of titania/RGO/CNT (TG1C1) which exhibited maximum specific capacitance around 477 F/g at current density 1 A/g. However, this capacitance value was further enhanced up to 537 F/g after 1 hour of UV light irradiation. This enhancement could be ascribed to photo-catalytic effect of TiO2 and corresponding genesis of photo-excited electrons on TiO2 surface which further channelized through interconnected RGO and CNT morphology and hence results in improved specific capacitance. These observations were in good agreement with cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis. The hybrid nanocomposite also showed satisfying energy density and power density. It was also found that prepared hybrid nanocomposites were stable up to 2000 cycles with maximum specific capacitance retention of 92% of initial value.
关键词： Energy storage,RGO-CNT hybrid,Titania,Specific Capacitance
更新于2025-09-10 09:29:36