Faculty Publications
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Item Enhancing the electrochemical performance of ZnO anode by novel additive of MoS2–SnO2 nanocomposite for the zinc alkaline battery application(Springer, 2022) Prabukumar, C.; Meti, S.; Bhat K, U.K.ZnO nanorods and ZnO microrods are synthesized as the anode material for the Zn alkaline battery application. The present work studies the electrochemical performance of ZnO with regard to its size, morphology and MoS2–SnO2 nanocomposite as its additive towards the alkaline battery application. The properties, such as oxidation–reduction reaction, anti-corrosion behaviour, charge-transfer resistance and suppression of hydrogen evolution reaction (HER), are studied in detail. The structural characterization of ZnO samples is performed by using X-ray diffractometry. The morphological analysis of ZnO and MoS2–SnO2 nanocomposite is performed by using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), respectively. The atomic absorption spectroscopy (AAS) is employed to determine the solubility of ZnO samples in KOH solution. The electrochemical properties of the bare ZnO and the ZnO with MoS2–SnO2 additive (MoS2–SnO2/ZnO) samples are characterized by using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), cathodic polarization and Tafel polarization techniques. The ZnO with nanorod morphology shows better electrochemical performance than ZnO microrods and ZnO nanoparticles with sphere-like or plate-like morphology. The addition of MoS2–SnO2 nanocomposite with the ZnO improved the electrochemical activity, suppressed the HER activity and improved the anti-corrosion behaviour of the ZnO samples. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.Item A study on effect of MgO nanoparticles loading on the electrical conducting properties of polyvinyl alcohol/polyaniline polymer composite films(Springer Science and Business Media B.V., 2022) Kanavi, P.S.; Meti, S.; Fattepur, R.H.; Patil, V.B.; Hunagund, S.M.; Patil, S.A.; Inamdar, S.R.In this work, the polyvinyl alcohol/polyaniline/magnesium oxide (PPM) polymer nanocomposite films were fabricated for electrical conductivity studies. Initially, the magnesium oxide (MgO) nanoparticles were synthesized by sol–gel method. Different PPM films were fabricated by varying the weight percent (0.2, 0.4, 0.6 and 1%) of MgO in the polyvinyl alcohol/polyaniline polymer blend. The films were obtained by casting the PPM solution in the Petri-dish and dried. The crystallinity and morphology of MgO and PPM films were characterized by the X-ray diffraction spectroscopy and field emission scanning electron microscopy (FESEM). The absorption spectra of MgO and PPM films were obtained by UV–visible spectroscopy. The Fourier transform infrared (FTIR) spectra were obtained to determine the chemical nature. The thermal stability of the films was studied by the differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA) techniques. The temperature-dependent (up to 150 °C) electrical conductivity of the PPM films was analysed by impedance equipment within the frequency band of 4 Hz to 1 MHz. The variation of MgO nanoparticles concentration in the polymer composite matrix and the increase in temperature influences the electrical conductivity of the films. Graphical Abstract: [Figure not available: see fulltext.] © 2022, The Author(s), under exclusive licence to Springer Nature B.V.Item Investigation of structural, thermal, magnetic, and dielectric properties of Yb+3 doped nickel cobalt ferrite nanomaterial for electro-magnetic applications(Springer, 2024) Patil, S.; Meti, S.; Anandalli, M.; Badiger, H.; Bhajantri, R.F.; Pratheek, L.; Muhiuddin, M.; Rahman, M.R.; Hegde, B.G.Herein, we report the synthesis of ytterbium (Yb) (with concentration x = 0.01, 0.015, 0.02, 0.025 and 0.03) doped in to nickel cobalt ferrite (NCYFO: YbxNi0.5Co0.5Fe2-xO4) nanoparticles at temperature 500 °C with phase pure spinel using solution combustion technique. The phase purity and effect of doping on NCYFO complex oxide on structural, thermal, magnetic and dielectric properties have been determined by various characterization techniques. The FTIR data reveal that strong metal oxide linkages can be observed in the tetrahedral and octahedral sites at wavenumbers 460 to 410 cm−1 and 595 to 540 cm−1. The X-ray diffraction (XRD) studies confirmed the spinel structure. The crystallite sizes and lattice parameters were estimated to be in the range of 31 to 22 nm and 8.32 to 8.35 Å, respectively. The X-ray photoelectron spectroscopy (XPS) study confirmed that the increase in Yb concentration results in accumulation of Yb in the grain boundaries of NCYFO in the form of Yb2O3. The thermal stability of nanoparticles were investigated using TGA/DSC method. Transmission Electron microscopy (TEM) studies and Field emission scanning electron microscopy (FESEM) used to study the particle size distribution and elemental composition within the nanomaterial. In addition, the dielectric properties, such as, dielectric constant and dielectric loss were investigated for all the NCYFO nanomaterial. The saturation magnetization of the NCYFO is determined using vibrating sample magnetometer (VSM) analysis and is maximum for x = 0.03 (Ms = 97.56 emu/g) sample. The high magnetic behaviour and better dielectric properties of the NCYFO nanomaterials are suitable for electro-magnetic applications. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.