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The growing demand for electricity has increased the interest of the researchers towards exploration of energy storing devices (ESDs). With the motif for developing electrochemical energy storage devices, this research work is focussed on the study of MoO3 nanoparticles and its doping with chromium as an efficient electrode material for energy stor...
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Co3O4 decorated MoS2 nanoflower (MoS2/Co3O4) has been successfully synthesized by a simple hydrothermal method. A combined experimental and theoretical investigation was performed to comprehend the effect of Co3O4 on the structural, optical, and electronic properties of MoS2 nanoflowers. A number of characterization techniques have been used to stu...
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... The capacitive behaviours of the materials were further supported by the galvanostatic charge-discharge (GCD) profiles recorded at varying current densities from 1 to 10 Ag − 1 ranging between the potential of 0 V -0.4 V (Fig. 16). The specific capacitance, energy density and power density values are calculated according to the formula provided in our previous work [65] and are given in Table 1. The specific capacitance and energy density values were found to be greater for Nb 2 O 5 -V 2 O 5 nanocomposite than Nb 2 O 5 nanoparticles. ...
... The specific capacitance values are calculated according to the formula provided in our previous work [38] and are given in Table 2. Highest specific capacitance value of 415 Fg − 1 was obtained for kaolin/g-C 3 N 4 / V 2 O 5 nanocomposite at the scan rate of 5 mVs − 1 which is greater than similar materials reported in the literature (Table 3). Since the electrolytic ions did not have adequate time to permeate into the electrode's active inner pores, the specific capacitance values fell at higher scan rates [39]. The better electrochemical performance of kaolin/g-C 3 N 4 / V 2 O 5 nanocomposite can be ascribed to the synergistic effect of V 2 O 5 and g-C 3 N 4 where the charge transfer path of g-C 3 N 4 improves the electrical conductivity of in g-C 3 N 4 /V 2 O 5 , for the rapid electron diffusion during charge and discharge processes. ...
In order to investigate the synergistic potential of a new nanocomposite for improved energy storage applications,
this work combines graphitic carbon nitride (g-C3N4), vanadium pentoxide (V2O5) and kaolin. Kaolin
functions as a structural matrix, offering stability and support for the integration of g-C3N4 and V2O5 nanoparticles.
It is well-known for its wide availability and thermal characteristics. A variety of analytical methods,
such as electrochemical analysis, scanning electron microscopy and X-ray diffraction, are used to characterise the
synthesised nanocomposite. The specific capacitance and cycling stability of the nanocomposite’s electrochemical
performance are rigorously assessed. Key issues in efficiency, stability and cost-effectiveness are
addressed by an optimised material for advanced energy storage systems, which is the result of the synergistic
effects coming from the unique features of each component. With a superior cyclic stability and capacitance
retention of 77.7 % even after 2000 cycles, the composite material exhibits a higher specific capacitance value of
415 Fg 1 at 5 mVs 1. This work is a major step towards the creation of novel nanocomposites for highperforming,
environmentally friendly energy storage systems.
... The optical properties of Ag 2 WO 4 and carbon functionalized Ag 2 WO 4 nanostructures (Fig. 7) were investigated in the wavelength range of 200-800 nm. The optical band gap of Ag 2 WO 4 nanostructures is obtained from the Tauc Plot of F(R) vs photon energy (hν) which is derived from the Kubelka-Munk function as follows [33]: ...
The study investigates the photodegradation of Acid Violet 7, a commonly used azo dye in textile industries,
using carbon functionalized Ag2WO4 nanostructures as a photocatalyst. The materials were characterised by Xray
diffraction, scanning electron microscopy, Fourier transform infrared spectra and UV-Vis diffuse reflectance
spectra. In this research work, carbon functionalized Ag2WO4 nanostructures is synthesized and evaluated for its
effectiveness in degrading Acid Violet 7 under visible light irradiation. The degradation process is explored by
investigating various parameters such as catalyst loading and initial dye concentration. It is worth mentioning
that the 75 % degradation is achieved in 30 minutes. The results demonstrate the photocatalytic activity of
carbon functionalized Ag2WO4 nanostructures in degrading Acid Violet 7, highlighting its potential for efficient
treatment of dye-contaminated wastewater. The primary active species involved in the degradation process is
identified to be the hydroxyl radical. The modification of Ag2WO4 nanostructures with carbonaceous material
enhances its photocatalytic performance by improving the light absorption and preserves the structural integrity
of the nanostructures. The carbon functionalized nanostructures investigated in this research holds great promise
towards the development of sustainable and effective photocatalytic system for environmental remediation.
... The conductivity and magnetic moment of α-MoO 3 can be improved by doping ions [12,13]. For example, α-MoO 3 doped with N, Co or Cr, the electrical conductivity can be improved [14][15][16]. Meanwhile, due to introduction of defects, the doped α-MoO 3 can effectively increase the dipole and magnetic moment, introducing interface polarization to absorb waves by dielectric loss and magnetic loss [14]. ...
A Co-doped α-MoO3 microwave absorber was prepared using by heat treatment technology. The oxygen vacancy, conductivity, and electromagnetic parameters of the material could be manipulated by changing the heat treatment temperature, and the microwave absorption mechanism was explored. XRD, Raman, SEM, XPS, and VNA were used to characterize the Co-doped α-MoO3 samples. The orthorhombic phases and scale-layer rod-like structure were observed to favor absorption via multiple transmission paths to EM waves. Notably, the material prepared by heat treatment at 500 °C exhibits a synergistic effect of magnetic and dielectric loss, due to its proper conductivity, rich interfaces and magnetism. The effective absorption bandwidth reaches 2.4 GHz .
Nowadays, many researchers aim to fill polymer materials with inorganic nanoparticles to enhance the polymer properties and gain the merits of the polymeric host matrix. Sol–gel synthesized Co3O4 nanoparticles are subjected to different doses of electron beam (10, 20, and 30 kGy) to study their physiochemical properties and choose the optimized nanoparticles to fill our polymeric matrix. Crosslinked polyethylene (XLPE) has been filled with 5 wt % of un-irradiated cobalt oxide nanoparticles using the melt extruder method. The structural, optical, magnetic, and electrical properties of the XLPE/Co3O4 nanocomposite before and after exposure to different doses of electron beam radiation have been characterized. The crystallite size of face-centered cubic spinel Co3O4 nanoparticles has been confirmed by XRD whereas and their unique truncated octahedral shape obviously appears in SEM micrographs. The crystallite size of Co3O4 nanoparticles has decreased from 47.5 to 31.5 nm upon irradiation at a dose of 30 kGy, and significantly decreased to 18.5 nm upon filling inside XLPE matrix. Related to the oxidation effect of the electron beam, the Co²⁺/Co³⁺ ratio on the surface of Co3O4 nanoparticles has decreased upon irradiation as verified by XPS technique. This consequently caused the partial elimination of oxygen vacancies, mainly responsible for the weak ferromagnetic behavior of Co3O4 in its nanoscale. This appears as decreased saturation magnetization as depicted by VSM. The XLPE/Co3O4 nanocomposite has also shown weak ferromagnetic behavior but the coercive field (Hc) has increased from 112.57 to 175.72 G upon filling inside XLPE matrix and decreased to 135.18 G after irradiating the nanocomposite at a dose of 30 kGy. The ionic conductivity of XLPE has increased from 0.133 × 10–7 to 2.198 × 10–3 S/cm upon filling with Co3O4 nanoparticles while a slight increase is observed upon irradiation.
