•Bi2Mo2O9 NPs were prepared by microwave combustion route.•Bi2Mo2O9 NPs were characterized by various techniques.•The EC properties were investigated by CV, GCD, and EIS.•The specific capacitance is ...197 F/g at 0.4 A/g with cycle stability of 94 %.•The results showed potential application for energy storage systems.
In this present work, bismuth molybdate (Bi2Mo2O9) nanoparticles (NPs) were prepared by microwave combustion method using urea as the fuel. The phase formation and purity of the product was identified by powder X-ray diffraction (XRD). Fourier transform-infrared (FT-IR) analysis was adopted to record the functional group of Bi2Mo2O9 NPs. The morphology, purity, size and elemental composition of the sample were confirmed by Scanning electron microscope (SEM), elemental mapping, energy dispersive X-ray (EDX) analysis and High-Resolution transmission electron microscope (HR-TEM) technique respectively. The UV–visible and photoluminescence (PL) spectra were used to examine optical and electronic behavior of the prepared sample at room temperature (RT). The chemical bonding of Bi2Mo2O9 NPs was studied by Raman spectroscopy. The magnetic properties of Bi2Mo2O9 NPs were examined by vibrating sample magnetometer (VSM) at RT. The particle size distribution was examined by X-ray Photoelectron spectroscopy (XPS). The Electrochemical (EC) properties of Bi2Mo2O9 NPs were investigated by Cyclic voltammetry (CV), Galvanostatic charge/discharge (GCD) and Electrochemical impedance spectral (EIS) studies. The specific capacitance (Cs) of prepared Bi2Mo2O9 NPs is 197 F/g at 0.4 A/g with excellent cycle stability of 94% specific capacitance after 1000 cycles. Hence, the results of electrochemical characteristics exhibits excellent performance and have potential application of electrode for energy storage systems.
Nickel molybdate (NiMoO4) nanoparticles (NPs) were synthesized by a simplistic one-pot microwave combustion method using urea as the fuel. The produced NPs have been examined by powder X-ray ...diffraction (XRD), Fourier transform infrared (FT-IR) analysis, scanning electron microscope (SEM), energy dispersive X-ray (EDX), high-resolution transmission electron microscopy (HR-TEM) analysis. Further, optical and electronic properties were determined by UV-Visible and Photoluminescence (PL) analysis, respectively. The magnetic performance of the NiMoO4 NPs was investigated by vibrating sample magnetometer (VSM) and the surface chemical composition was identified by X-ray photoelectron spectroscopy (XPS). The electrochemical activities of the NiMoO4 NPs were studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge/discharge (GCD) analysis. From the results, the CV curves indicated the occurrence of redox couples and besides with the EIS data (Nyquist plot), confirmed the supercapacitor nature of the synthesized NiMoO4. The prepared NiMoO4 exhibits a high specific capacitance and rateability. This electrode grants a high specific capacitance of 450 F g−1 at 2 mA cm−2 and the well permanency with a cycling proficiency of 94% after 1000 cycles. These results clearly showed that the synthesized NiMoO4 NPs have potential application for the forthcoming flexible and lightweight energy storage.
Copper molybdate (CuMoO4) nanoparticles (NPs) were synthesized by microwave combustion method and urea act as the fuel. The formation of nanocrystalline structure was confirmed by X-ray powder ...diffraction (XRD). The chemical composition of the CuMoO4 NPs was investigated by Fourier transform infrared (FT-IR) spectroscopy. Scanning electron microscope (SEM) associated with energy dispersive X-ray (EDX) was used to investigate morphological and elemental composition of the prepared sample. The morphology and particle size of sample were investigated by high-resolution transmission electron microscope (HR-TEM) analysis. The optical and electronic defects were confirmed by the UV-Vis absorption and photoluminescence (PL) spectroscopy at room temperature (RT). The magnetic behavior was analyzed by vibrating sample magnetometer (VSM) analysis recorded at RT. The X-ray Photoelectron spectroscopy (XPS) was used to analyze the chemical state of the elements in the prepared sample. The electrochemical behavior was examined by cyclic voltammetry (CV), galvanostatic charge and discharge analysis (GCD) and electrochemical impedance spectroscopy (EIS). The presence of redox pairs is showed in CV curves and along with the EIS data showed the supercapacitor nature. The GCD analysis displayed discharge curves and a high specific capacitance of ~ 127 F/g was acquired at a stable discharge current density (1 mA/cm2). The cyclic stability analysis showed capacitance retention of about 82.5% after 1000 cycles, proposing the potential application of CuMoO4 in energy storage devices.
Nanorod shaped cobalt molybdate (CoMoO4) electro-catalysts synthesized by microwave combustion route using urea as the fuel. The formation of monoclinic nanocrystalline structure, metal-oxygen (M–O) ...and chemical bonding was confirmed by X-ray powder diffractometry (XRD), Fourier transform infrared (FT-IR) and Raman spectroscopy, respectively. Scanning electron microscope (SEM) associated with energy dispersive X-ray (EDX) and high-resolution transmission electron microscope (HR-TEM) were used to confirm the morphology, elemental composition and particle size of the samples, respectively. The optical and defects were confirmed by the UV–vis. absorption and photoluminescence (PL) spectroscopy at room temperature (RT). The room temperature magnetic behaviors of product were investigated by vibrating sample magnetometer (VSM). Surface binding energy and element confirmation were examined by X-ray Photoelectron spectroscopy (XPS). The electrochemical (EC) performance was studied by cyclic voltammetry (CV), galvanostatic charge-discharge analysis (GCD) and electrochemical impedance spectroscopy (EIS) analysis. The CV curve proved the existence of redox pairs and the supercapacitor nature exhibited by the EIS (Nyquist plots). The GCD studies provided the non-symmetrical discharge curves and the highest specific capacitance (Csp) of ~ 133 F/g were acquired at a constant discharge current density (1 mA/cm−2). The cyclic stability investigations revealed capacitance retention of about 100% after 1000 cycles, proposing the prospective usage of CoMoO4 in energy-storage devices.
In this paper, the generalized nonautonomous Hirota equation was investigated with the help of symbolic computation. Using Darboux transformation method three soliton and four soliton solutions were ...developed based on Lax pair construction. The corresponding figures are plotted to show the properties of the constructed soliton solutions. By manipulating autonomous and nonautonomous profile, various soliton systems are investigated. These solitons systems have potential applications in the design of soliton compressor, soliton amplification, and high-speed optical devices in ultra large data transmission systems. In future experiments, the findings of this study are expected to be demonstrated.
Zinc oxide (ZnO) nanocatalyst was doped with nickel (Ni2+) and silver (Ag2+) by co-precipitation method for effective degradation of acid blue 113 dye (AB113) from textile industries wastewater. The ...synthesized co-doped nanocatalyst was characterised using a scanning electron microscope, and its size was around 50-200 nm. The elemental constituents of Ag2+ and Ni2+ in the co-doped zinc oxide nanocatalyst have analysed the results of energy dispersive analysis. The effects of the process parameters pH, initial dye concentration and catalyst loading were optimized to get the maximum dye removal from the wastewater. The acid blue 113 dye gets degraded entirely once it was subjected to irradiation of 120 min. The co-doped and un-doped zinc oxide nanocatalyst were used to degrade dye molecules. The co-doped ZnO nanocatalyst was twice effective as the un-doped ZnO nanocatalyst in the entire dye degrading phenomena upon exposure to the sunlight. The kinetic models have been applied to predict kinetic behaviour, and its mechanism. The present study promotes the importance of co-doped ZnO nanocatalysts in the treatment of azo dyes discharged from the textile industry.
•Enhancing photocatalytic activity of ZnO films by double doping and vacuum annealing.•Photocatalyst films are prepared by a low-cost and low-time consuming method.•All the physical properties are ...well correlated with photocatalytic activity.
Doubly (Sn+F) doped zinc oxide (ZnO:Sn:F) thin films were deposited onto glass substrates using a simplified spray pyrolysis technique. The deposited films were annealed at 400°C under two different ambiences (air and vacuum) for 2h. The photocatalytic activity of these films was assessed through photocatalytic decolorization kinetics of Methylene Blue (MB) dye and the decolorization efficiency of the annealed films was compared with that of their as-deposited counterpart. The photocatalytic studies reveal that the ZnO:Sn:F films annealed under vacuum environment exhibits better photocatalytic efficiency when compared with both air annealed and as-deposited films. The SEM and TEM images depict that the surface of each of the films has an overlayer comprising of nanobars formed on a bottom layer, having spherical grains. The studies show that the diameter of the nanobars plays crucial role in enhancing the photocatalytic activity of the ZnO:Sn:F films. The structural, optical and electrical studies substantiate the discussions on the photocatalytic ability of the deposited films.
In this paper, with the aid of symbolic computation, we investigate the generalized nonlinear Schrödinger Maxwell–Bloch equation, which describes the propagation of the optical soliton through an ...inhomogeneous two-level dielectric tapered fiber medium. By virtue of the Darboux transformation method, two-soliton solutions are generated based on the constructed Lax pair and figures are plotted to illustrate the properties of the obtained solutions. Moreover, through manipulating the dispersion and nonlinearity profiles, various soliton control systems are investigated which is promising for potential applications in the design of soliton compressor, soliton amplification and high-speed optical devices in ultralarge capacity transmission systems. This means that we are able to control the soliton types with suitably selected values of the parameters. Additionally more soliton control techniques are proposed and investigated. We expect that the above analysis could be observed in future experiments.
The calcium mercaptosuccinate (Ca-MS) functionalized poly(ε-caprolactone) (PCL) was successfully synthesized by ring-opening polymerization (ROP) method at 160 °C for 2 h under nitrogen atmosphere ...with mild stirring in the presence of stannous octoate (SO) as ROP catalyst. The synthesized Ca-MS functionalized PCL was characterized by FTIR spectroscopy, NMR spectroscopy, atomic force microscopy, HRTEM and polarized optical microscopy (POM) like analytical techniques. The microstructure of Ca-MS nucleated PCL crystals was analysed by POM. The thermal properties of Ca-MS functionalized PCL were examined using differential scanning calorimetry and thermogravimetric analysis techniques. The non-isothermal crystallization and degradation kinetic studies were carried out to assess the crystallinity as well as the energy of activation (
E
a
) of Ca-MS functionalized PCL. The FTIR spectrum showed a peak at 1720 cm
−1
corresponding to the carbonyl stretching of PCL. The
1
H-NMR spectrum showed an alkoxy proton signal at 4.1 ppm. The non-isothermal crystallization kinetic study showed the 3D crystal growth with the
E
a
value of 142.4 kJ/mol.
