Browsing by Author "Suvarnna K"

Filter results by typing the first few letters
Now showing 1 - 4 of 4
  • No Thumbnail Available
    Item
    CORN SILK EXTRACT–BASED SOLID-STATE BIOPOLYMER ELECTROLYTE AND ITS APPLICATION TO ELECTROCHEMICAL STORAGE DEVICES
    (SpringerLink, 2022-01-24) Suvarnna K; Jone Kirubavathy S; Selvasekarapandian S; Vengadesh Krishna M; Mangalam, Ramaswamy
    A solid-state biopolymer electrolyte was prepared from the biomaterial Corn Silk Extract (CSE) by blending with polyvinyl alcohol and different concentration of MgCl2 by opting solution casting technique. The maximum ionic conductivity of 1.74 × 10−5 Scm−1 for the blend pure biopolymer (0.9 g CSE + 1 g PVA) and 1.28 × 10−3 Scm−1 for the biopolymer electrolyte was obtained from the AC Impedance analysis. The obtained biopolymer electrolyte is characterized by Fourier transform infrared spectroscopy to look into the complex formation of the biopolymer blend and the salt. The maximum amorphous nature has been observed for 0.9 g CSE + 1 g PVA + 0.45wt% MgCl2 by the XRD technique. Glass transition temperature of the biopolymer electrolyte was found by the differential scanning calorimetry (DSC) process. The electrochemical potential window of the biopolymer electrolyte with maximum conductivity is obtained as 2.65 V in linear sweep voltammetry (LSV). The transference number is calculated from Wagner’s and Evan’s polarization techniques. A primary Mg-ion battery is constructed with an open-circuit voltage of 1.95 V at room temperature.
  • No Thumbnail Available
    Item
    DEVELOPMENT OF A SOLID BIO-ELECTROLYTE FROM A SEAWEED EXTRACT – POLYVINYL ALCOHOL BLEND FOR PRIMARY MG-ION CONDUCTING BATTERIES
    (Chemistry Europe, 2023-06-01) Suvarnna K; Shanjitha S; Selvasekarapandian S; Jone Kirubavathy S
    A novel solid bio-electrolyte from seaweed acts as a potential candidate for electrolytes in batteries by solution casting technique. The ethanol extract of seaweed Sargassum Muticum (SME) is blended with PVA to prepare the bio-membrane and along with MgCl2 as the ionic provider, a solid bio-electrolyte is produced. The ionic conductivity of the prepared bio-membrane, 1 g SME+0.8 g PVA is 1.57×10−6 S cm−1. XRD analysis affirms the amorphous nature of the prepared bio-electrolytes and the highest degree of amorphous nature is apparent for the composition of 1 g SME+0.8 g PVA+0.7 wt% MgCl2. Complex formation between the SME, polyvinyl alcohol, and the added charge carrier has been made evident from the FTIR technique. Thermal properties of the bio-electrolytes by differential scanning calorimetry (DSC) are supported by the low Tg. Electrochemical impedance analysis for the prepared bio-electrolytes and the maximum ionic conductivity of 2.22×10−3 S cm−1 is exhibited by 1 g SME+0.8 g PVA+0.7 wt% MgCl2 membrane. A primary magnesium-ion conducting battery has been constructed with the highest conducting bio-electrolyte membrane and an open circuit voltage of 2.18 V validates the application of this bio-membrane as a promising solid electrolyte for energy storage devices.
  • No Thumbnail Available
    Item
    INVESTIGATION OF CORN BIOMASS/POLYVINYL ALCOHOL BASED BIO-ELECTROLYTE FOR LITHIUM-ION CONDUCTING BATTERY (Article)
    (John Wiley and Sons Inc, 2025-03-26) Suvarnna K; Dhanushiya P; Shanjitha S; Selvasekarapandian S; Jone Kirubavathy S
    Natural corn biomass-based electrolytes blended with polyvinyl alcohol (PVA) have been prepared as the host matrix with various concentrations of lithium chloride as the ionic dopant. The optimized composition of the cornsilk extract (CSE)/PVA blend–0.9 g CSE + 1 g PVA has been prepared by the solution casting technique. The amorphous nature of the prepared bio-electrolyte 0.9 g CSE + 1 g PVA + 0.5wt% LiCl (CSLC 0.5) was confirmed by the X-ray diffraction technique (XRD). This was also supported by the differential scanning calorimetry (DSC) by the lowest glass transition temperature of 46.32 °C for the optimized CSLC 0.5 membrane. Fourier transform infrared (FTIR) spectroscopy explains the complex formation of the CSE/PVA blend with the ionic dopant lithium chloride. AC impedance analysis evidenced the maximum ionic conductivity of 2.5 × 10−3 S cm−1 for the membrane CSLC 0.5. The open circuit voltage was observed as 1.93 V, and its discharge performance has been analyzed.
  • No Thumbnail Available
    Item
    INVESTIGATION OF SOLID BIO-MEMBRANE BASED ON CORN BIOMASS AS A PROTON-CONDUCTING BIO-ELECTROLYTE
    (Springer Link, 2023-05-29) Suvarnna K; Shanjitha S; Selvasekarapandian S; Jone Kirubavathy S
    A solid bio-electrolyte has been prepared by blending the extract of the silk part of the corn biomass (corn silk extract, CSE), polyvinyl alcohol (PVA) and NH4HCO2 as the charge carrier via the solution casting technique. This biodegradable electrolyte is optimized by the AC impedance analysis for the composition 1 g PVA + 0.9 g CSE + 0.5 wt% NH4HCO2 from their maximum conductivity values. The highest ionic conductivity for this optimized composition at room temperature is 3.302×10–3 S cm–1. This bio-electrolyte is then characterized by X-ray diffraction technique, Fourier transform infrared spectroscopy, differential scanning calorimetry, transference number analysis and electrochemical impedance spectroscopy. A primary proton-conducting battery was constructed with an output circuit voltage of 1.83 V at room temperature. A single stack PEM fuel cell has been constructed with the bio-electrolyte (0.9 g CSE + 1 g PVA + 0.5 wt% NH4HCO2) and obtained an output circuit of 480 mV. This work implies the possibility of the development of an electrolyte from a biodegradable and renewable source for energy storage applications.