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      https://www.ias.ac.in/article/fulltext/jcsc/124/04/0747-0762

    • Keywords

       

      Hybrid ultracapacitor; substrate-integrated PbO2 electrode; silica-gel electrolyte.

    • Abstract

       

      Lead-Carbon hybrid ultracapacitors (Pb-C HUCs) with flooded, absorbent-glass-mat (AGM) and silica-gel sulphuric acid electrolyte configurations are developed and performance tested. Pb-C HUCs comprise substrate-integrated PbO2 (SI-PbO2) as positive electrodes and high surface-area carbon with graphite-sheet substrate as negative electrodes. The electrode and silica-gel electrolyte materials are characterized by XRD, XPS, SEM, TEM, Rheometry, BET surface area, and FTIR spectroscopy in conjunction with electrochemistry. Electrochemical performance of SI-PbO2 and carbon electrodes is studied using cyclic voltammetry with constant-current charge and discharge techniques by assembling symmetric electrical-double-layer capacitors and hybrid Pb-C HUCs with a dynamic Pb(porous)/PbSO4 reference electrode. The specific capacitance values for 2 V Pb-C HUCs are found to be 166 F/g, 102 F/g and 152 F/g with a faradaic efficiency of 98%, 92% and 88% for flooded, AGM and gel configurations, respectively.

    • Author Affiliations

       

      A Banerjee1 M K Ravikumar1 A Jalajakshi1 P Suresh Kumar1 S A Gaffoor2 A K Shukla1

      1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
      2. NED Energy Limited, 6-3-1109/1, Navbharat Chambers, Raj Bhavan Road, Hyderabad 500 082, India
    • Dates

       
    • Supplementary Material

       
  • Journal of Chemical Sciences | News

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