SUNDARAMOORTHY GURULAKSHMI

@gurunanakcollege.edu.in

ASSISTANT PROFESSOR, DEPARTMENT OF PHYSICS
Guru Nanak College (Autonomous), Chennai, India

SUNDARAMOORTHY GURULAKSHMI


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https://researchid.co/gurulakshmi

EDUCATION

M.SC., M.PHIL

RESEARCH INTERESTS

POLYMER ELECTROLYTE, BATTERIES, SOLID STATE IONICS
2

Scopus Publications

Scopus Publications

  • Studies on composite PVA-Ca-NH4CF3SO3-Al2O3 polymer electrolyte for electrochemical devices
    S. Gurulakshmi, S. Madeswaran, S. Karthikeyan, V. Porchezhiyan
    Asian Journal of Chemistry, 2019
    In the present study, polymer electrolyte with poly(vinyl alcohol) (PVA) blended with cellulose acetate (CA) was chosen to prepare composite electrolyte using ammonium triflate salt and nano sized alumina (Al2O3- < 50 nm) by the solution casting method. The as prepared samples were characterized by X-ray diffraction, FT-IR, differential scanning calorimetry and AC impedance spectra. The loss tangent and dielectric studies were carried out for all the prepared samples using AC impedance analysis. Activation energy with regression values and relaxation time were calculated and found to be low for the highest conducting membranes. The presence of 0.1 mol content of nano alumina has enhanced the ionic conductivity significantly to the value of 2.012 × 10-3 S/cm from that of the filler-free electrolyte (2.93 × 10-4 S/cm). Ionic transference number was calculated by electrostatic polarization method and it was found to be 0.9684, which shows the conducting species were ions. A proton battery fabricated using the configuration Zn+ZnSO4. H2O || PVA-CA-0.5 mol NH4CF3SO3-0.1 mol Al2O3 || PbO2 + V2O5 produced a steady state open circuit voltage of 1.39 V, which proves the prepared composite electrolyte is suitable solid electrolyte for electrochemical devices.
  • Study of PVA/CA/NH4 SCN/ethylene carbonate/Al2O3 polymer nano-composite electrolyte system
    S. Gurulakshmi, S. Madeswaran, S. Karthikeyan, S. Selvasekarapandian, S. Monisha
    Springer Proceedings in Physics, 2017
    Poly (vinyl alcohol)—Cellulose acetate (PVA/CA) blend polymer doped with Ammonium thiocyanate salt in the presence of Ethylene Carbonate (EC) as a plasticizer were prepared by simple solution casting technique. PVA/CA blend ratio was first optimized for highest conductivity value (3.63 × 10−6 S/cm). The ionic conductivity of PVA/CA blend was further enhanced by adding 0.5 mol wt% NH4SCN and 0.3 mol wt% EC. The value of the ionic conductivity at room temperature was increased to 7.7 × 10−4 S/cm. AC impedance spectroscopy studies were used to calculate ionic conductivity values. Fourier Transform—Infrared Spectroscopy measurements revealed the existence of blending and salt complexation with host polymer. Activation energy and relaxation time were observed for the prepared plasticized membranes using Arrhenius plot and loss tangent spectra. The ionic conductivity at room temperature was further increased to the value of 2.1 × 10−3 S/cm by the addition of nano-alumina particles.

Publications


1. S. Gurulakshmi, S. Madesaran, S. Karthikeyan; V.Porchezhiyan, Studies on Composite PVA-CA-NH4CF3SO3-Al2O3 Polymer Electrolyte for Electrochemical Devices. asian journal of chemistry 2019, 31 (5), 1181-1188.


2,Gurulakshmi S., Madeswaran S., Karthikeyan S., Selvasekarapandian S., Monisha S. (2017) Study of PVA/CA/NH4SCN/Ethylene Carbonate/Al2O3 Polymer Nano-Composite Electrolyte System. In: Ebenezar J. (eds) Recent Trends in Materials Science and Applications. Springer Proceedings in Physics, vol 189. Springer,