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      https://www.ias.ac.in/article/fulltext/boms/043/0030

    • Keywords

       

      Ammonium bromide; dextran; polymer electrolyte; ionic conductivity; biopolymer.

    • Abstract

       

      Biopolymer electrolytes (BPEs), consisting of ammonium bromide (NH$_4$Br) as the ionic provider and dextran(Leuconostoc mesenteroides) as the polymer host, are prepared by the solution cast technique. Interactions of cations from the salt have been confirmed with hydroxyl (OH) and glycosidic linkage (C–O–C) groups of dextran via Fourier transforminfrared analysis. Electrolyte with 20 wt% NH4Br maximized the ionic conductivity up to $(1.67 \pm 0.36) \times 10^{−6}$ S cm$^{−1}$. The trend of conductivity has been verified by field emission scanning electron microscopy, where the electrolyte surface became rough as the concentration of NH4Br exceeded 20 wt%. The contribution of ions as the main charge carrier in theBPE is confirmed by transference number analysis as $t_{\rm ion} = 0.92$ and $t_e = 0.08$. From linear sweep voltammetry, it is found that the highest conducting BPE in this work is electrochemically stable from 0 to 1.62 V. The fabricated electrochemical double-layer capacitor (EDLC) has been tested for 100 charge–discharge cycles and verified by cyclic voltammetry.

    • Author Affiliations

       

      M H HAMSAN1 M F SHUKUR2 SHUJAHADEEN B AZIZ3 4 Y M YUSOF5 M F Z KADIR6

      1. Institute for Advanced Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
      2. Fundamental and Applied Sciences Department, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Malaysia
      3. Advanced Polymeric Materials Research Laboratory, Department of Physics, College of Science, University of Sulaimani, Sulaimani, Kurdistan Regional Government 46001, Iraq
      4. Komar Research Center (KRC), Komar University of Science and Technology, Sulaimani, Kurdistan Regional Government 46001, Iraq
      5. Universiti Kuala Lumpur Malaysian Institute of Chemical and Bio-Engineering Technology (UniKL MICET), 78000 Alor Gajah, Malaysia
      6. Centre for Foundation Studies in Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
    • Dates

       
  • Bulletin of Materials Science | News

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