title: Electrical, structural, thermal and electrochemical properties of corn starch-based biopolymer electrolytes.
abstract: Biopolymer electrolytes containing corn starch, lithium hexafluorophosphate (LiPF6) and ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate (BmImPF6) are prepared by solution casting technique. Temperature dependence-ionic conductivity studies reveal Vogel-Tamman-Fulcher (VTF) relationship which is associated with free volume theory. Ionic liquid-based biopolymer electrolytes show lower glass transition temperature (Tg) than ionic liquid-free biopolymer electrolyte. X-ray diffraction (XRD) studies demonstrate higher amorphous region of ionic liquid-added biopolymer electrolytes. In addition, the potential stability window of the biopolymer electrolyte becomes wider and stable up to 2.9V. Conclusively, the fabricated electric double layer capacitor (EDLC) shows improved electrochemical performance upon addition of ionic liquid into the biopolymer electrolyte. The specific capacitance of EDLC based on ionic liquid-added polymer electrolyte is relatively higher than that of ionic liquid-free polymer electrolyte as depicted in cyclic voltammogram.
authors.affiliation: Centre for Ionics of University Malaya, Department of Physics, Faculty of Science, University of Malaya, Lembah Pantai, 50603 Kuala Lumpur, Malaysia. Electronic address: liewchiamwen85@gmail.com.
authors.forename: Chiam-Wen
authors.initials: CW
authors.lastname: Liew
authors.affiliation: Centre for Ionics of University Malaya, Department of Physics, Faculty of Science, University of Malaya, Lembah Pantai, 50603 Kuala Lumpur, Malaysia. Electronic address: rameshtsubra@gmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Ramesh
mesh_terms: D001704:Biopolymers / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D004553:Electric Conductivity; D055664:Electrochemical Techniques; D004573:Electrolytes / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry; D013213:Starch / Q000737:chemistry*; D044366:Transition Temperature; D003313:Zea mays / Q000737:chemistry* / Q000378:metabolism
chemical_list: C412621:1-butyl-3-methylimidazolium hexafluorophosphate; D001704:Biopolymers; D004573:Electrolytes; D007093:Imidazoles; D052578:Ionic Liquids; D013213:Starch
keywords: Capacitance; Corn starch; EDLC; Ionic liquid