Malaysian Journal of Analytical Sciences Vol 24 No 5 (2020): 744 - 756

 

 

 

 

CARBOXYMETHYL CHITOSAN-BASED BIOPOLYMER ELECTROLYTE WITH IMIDAZOLIUM IONIC LIQUID

 

(Elektrolit Biopolimer Berasaskan Karboksimetil Kitosan Dengan Cecair Ionik Imidazolium)

 

Intan Juliana Shamsudin¹*, Norsyabila Shrgawi¹, Hussein Hanibah², Nur Hasyareeda Hassan³, Azizan Ahmad³

 

¹ Chemistry & Biology Department, Centre for Defence Foundation Studies,

National Defence University of Malaysia, 57000 Kuala Lumpur, Malaysia
² Centre of Foundation Studies,

Universiti Teknologi MARA,  Selangor Branch, Dengkil Campus, 43800 Dengkil, Selangor Darul Ehsan, Malaysia
³ School of Chemical Sciences and Food Technology, Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor Darul Ehsan, Malaysia

 

* Corresponding author:  intanjuliana@upnm.edu.my

 

 

Received: 13 November 2019; Accepted: 3 September 2020; Published:  12 October 2020

 

 

Abstract

Solid biopolymer electrolyte based on carboxymethyl chitosan has been successfully prepared with ionic liquid 1-butyl-3-methylimidazolium acetate, [Bmim][OAc] as the charge carrier. The strong interactions of the ionic liquid with the biopolymer host were detected by several changes in the FTIR spectra. The decreased percentage of the crystallinity index derived from the XRD diffractograms suggested the amorphous nature of the film prepared. SEM observations showed formation of the linkages due to the plasticising effect of [Bmim][OAc]. Higher amount of [Bmim][OAc] led to the enhancement in the ionic conductivity, σ. The highest σ achieved was (3.05 ± 0.35) x 10^-3 S cm^-1 measured at ambient temperature. The highest conducting electrolyte achieved high electrochemical stability up to ±2.8 V measured by linear sweep voltammetry (LSV). Transference number measurement confirmed that ions were the major contributor in the conduction of electrolyte with ±0.980 ion transference number.

 

Keywords:  carboxymethyl chitosan, ionic liquid, imidazolium, biopolymer electrolytes, ionic conductivity

 

Abstrak

Elektrolit biopolimer pepejal berasaskan karboksimetil kitosan telah berjaya disediakan dengan cecair ionik 1-butil-3-metillimidazolium asetat, [Bmim][OAc] sebagai pembawa cas. Interaksi yang kuat di antara cecair ionik dengan perumah biopolimer dikesan oleh beberapa perubahan dalam spektrum FTIR. Peratusan penurunan indeks penghabluran yang diperolehi daripada difraktogram XRD mencadangkan sifat amorfus filem yang disediakan. Pemerhatian SEM menunjukkan pembentukan jaringan kerana kesan pemplastikan [Bmim][OAc]. Lebih banyak jumlah [Bmim][OAc] membawa kepada peningkatan dalam kekonduksian ionik, σ. Kadar tertinggi σ dicapai (3.05 ± 0.35) x 10^-3 S cm^-1 yang diukur pada suhu ambien. Elektrolit berkonduksian tertinggi mencapai kestabilan elektrokimia yang tinggi sehingga ± 2.8 V diukur dengan voltammetri sapuan linear (LSV). Pengukuran nombor pemindahan mengesahkan bahawa ion adalah penyumbang utama dalam pengaliran elektrolit dengan nombor pemindahan ion sebanyak ± 0.980.

 

Kata kunci:  karboksimetil kitosan, cecair ionik, imidazolium, elektrolit biopolimer, konduktiviti ionik

 

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