Sains Malaysiana 49(2)(2020): 305-313

http://dx.doi.org/10.17576/jsm-2020-4902-08

Incorporating 1-butyl-3-methylimidazolium Chloride Ionic Liquid into Iota Carrageenan Solid Biopolymer Electrolyte for Electrochemical Devices Application

(Pencampuran Cecair Ionik 1-butil-3-metilimidazolium Klorida ke dalam Elektrolit Biopolimer Pepejal Iota Karagenan bagi Aplikasi Peranti Elektrokimia)

NUR AZLINA ABDUL GHANI¹, FARAH HANNAN ANUAR¹, AZIZAN AHMAD¹, NADHRATUN NAIIM MOBARAK¹, INTAN JULIANA SHAMSUDIN², MARIAH ZULIANA DZULKIPLI¹ & NUR HASYAREEDA HASSAN¹*

¹Centre for Advance Material and Renewable Resources, Faculty of Science and Technology Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Chemistry Department, Centre for Defence Foundation Studies, National Defence University of Malaysia, 57000 Kuala Lumpur, Federal Territory, Malaysia

Diserahkan: 5 Disember 2018/Diterima: 27 Oktober 2019

ABSTRACT

Solid biopolymer electrolyte based on iota carrageenan and 1-butyl-3-methylimidazolium chloride, [Bmim]Cl were successfully prepared by solution casting technique. Weight percentage (wt. %) of [Bmim]Cl was varied from 0 wt. % to 100 wt. % and the highest ionic conductivity achieved was 2.70 × 10^-3 S cm^-1 for 70 wt. % [Bmim]Cl at ambient temperature. The interaction between iota carrageenan and [Bmim]Cl was confirmed by the formation of new peak on the ATR-FTIR spectrum. The reduction in crystallinity of iota carrageenan as the inclusion of [Bmim]Cl was observed based on X-ray diffraction (XRD) spectroscopy. FESEM morphology showed the compatibility and homogeneity between iota carrageenan and [Bmim]Cl while the LSV analysis showed that solid biopolymer electrolyte-based iota carrageenan-[Bmim]Cl possess high electrochemical stability up to 3.0 V. The transference number (TN) analysis indicated that ions are the main contributor for the ionic conduction.

Keywords: Iota carrageenan; ionic conductivity; ionic liquid; solid polymer electrolyte

ABSTRAK

Elektrolit biopolimer pepejal berasaskan iota karagenan dan 1-butil-3-metilimidazolium klorida, [Bmim]Cl berjaya dihasilkan melalui teknik pengacuan larutan. Peratus berat (% bt.) [Bmim]Cl divariasikan daripada 0 % bt.  sehingga 100 % bt. dan kekonduksian ionik tertinggi adalah 2.70 × 10^-3 S cm^-1 bagi 70 % bt. [Bmim]Cl pada suhu ambien. Interaksi antara iota karagenan dan [Bmim]Cl disahkan dengan pembentukan puncak baru pada spektrum ATR-FTIR. Pengurangan dalam penghabluran karagenan apabila [Bmim]Cl dimasukkan diperhatikan berdasarkan spektroskopi belauan sinar-X (XRD). Morfologi FESEM memperlihatkan keserasian dan kehomogenan antara iota karagenan dengan [Bmim]Cl manakala analisis LSV menunjukkan bahawa elektrolit biopolimer pepejal berasaskan iota karagenan-[Bmim]Cl mempunyai kestabilan elektrokimia yang tinggi sehingga 3.0V. Analisis nombor pemindahan (TN) membuktikan bahawa ion adalah penyumbang utama bagi pengkonduksian ionik.

Kata kunci: Cecair ionik; elektrolit biopolimer pepejal; iota karagenan; konduksian ionic

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*Pengarang untuk surat-menyurat; email: syareeda@ukm.edu.my