Search

The solution-cast method was used to prepare new solid polymer electrolytes (SPEs) that conduct potassium ions and are based on polyethylene glycol (PEG) complexed with potassium nitrate (KNO3). This polymer electrolyte system was characterized using different experimental techniques, such as X-ray diffraction (XRD), differential scanning calorimetry (DSC), composition vs. conductivity, temperature vs. conductivity, frequency-dependent conductivity, and dielectric measurements. The degree of crystallinity decreased with increasing salt concentration, according to the X-ray diffraction and DSC patterns of PEG with KNO3 salt. For PEG: KNO3 (80 : 20) composition, an optimum conductivity of 8.24× KT−6 S/cm was recorded at 30 °C. Compared with pure PEG, the optimum conducting composition (OCC) conductivity increased by two orders of magnitude. The temperature range of 303 to 333 K was used for the temperature-dependent conductivity experiments. The findings demonstrate that the conductivity obeys the Arrhenius rule and increases as the temperature rises. A dc plateau and a dispersive zone were observed in the conductance spectrum, which also follows Jonscher's power law. It was investigated how temperature and frequency affect the dielectric permittivity. An electrochemical cell with the configuration K/(80PEG : 20KNO3)/(I2+C+electrolyte) was constructed using an 80 : 20 electrolyte system, and its discharge properties were investigated. The cell's open circuit voltage was measured at 2.48 V. [ABSTRACT FROM AUTHOR]

The 2D materials have seen recent significant development in terms of material features with superior electrochemical capability. This urges for extensive research as potential aspirants for energystorage applications. Herein, the synthesis of MoS2 nanostructures with molar ratio 1:30 (nanosheets) and 1:15 (nanoflower) of ammonium molybdate tetrahydrate and thiourea single‐steps hydrothermal methods through different reaction times and observed enhanced interlayer spacing is reported. Field emission scanning electron microscopy analysis reveals that synthesized MoS2 nanostructure has 3D flower‐like and ultrathin 2D sheet‐like morphologies. The enhanced interlayer spacing in nanoflower over nanosheet is confirmed through high‐resolution transmission electron microscopy. The X‐ray diffraction and Raman studies reveal the hexagonal crystalline phase of MoS2 (2H‐MoS2). Surface functional groups present are studied by Fourier transform infrared. Through X‐ray photoelectron spectroscopy, the chemical composition with its binding energy of prepared MoS2 is observed. Specific surface area and pore‐size distribution of both 2H‐MoS2 nanosheets and nanoflower are examined by Brunauer–Emmett–Teller and Barrett–Joyner–Halenda analysis. Owing to these excellent physicochemical properties, nanoflower also exhibits energy‐storage device capability. MoS2 nanoflower demonstrates high specific capacitance and cyclic stability in three‐electrode systems. A practical approach is investigated to test the practical application of enhanced interlayer spacing by studying the time of charge and discharge of light‐emitting diode. [ABSTRACT FROM AUTHOR]