Malaysian Journal of Analytical Sciences Vol 24 No 5 (2020): 682 - 697

 

 

 

 

ELECTRICAL AND INFRARED SPECTROSCOPIC ANALYSIS OF SOLID POLYMER ELECTROLYTE BASED ON POLYETHYLENE OXIDE AND GRAPHENE OXIDE BLEND

 

(Kajian Elektrik dan Spektroskopik Inframerah kepada Elektrolit Polimer Pepejal Campuran Polietilena Oksida dan Grafena Oksida)

 

Ahmad Syafiq Fauzan Mohd Asnawi¹, Alyaa Amalina Mohd Azli², Muhamad Hafiz Hamsan², Mohd Fakhrul Zamani Abdul Kadir ³,Yuhanees Mohamed Yusof ¹*

 

¹Chemical Engineering Section,

Universiti Kuala Lumpur, Malaysian Institute of Chemical & Bioengineering Technology, 78000 Alor Gajah, Malacca, Malaysia

²Institute of Graduate Studies

³Centre for Foundation Studies in Science

University of Malaya, 50603 Kuala Lumpur, Malaysia

 

*Corresponding author: yuhanees@unikl.edu.my

 

 

Received: 30 March 2020; Accepted: 21 August 2020; Published: 12 October 2020

 

 

Abstract

Poly(ethylene oxide) (PEO), polyvinyl alcohol (PVA), and poly(ethylene carbonate) are synthetic polymers that have been widely used as polymer host in solid polymer electrolyte (SPE). A proton source, for example, lithium triflate (LiCF₃SO₃), ammonium bromide (NH₄Br), and ammonium fluoride (NH₄F) are doped in the polymer blend to provide the mobile Li⁺ or H⁺ ions. Polymer blending has been introduced to improve the properties of SPEs due to the easy preparation and excellent physical properties. In the present work, SPEs hosted by poly(ethylene oxide) (PEO) - graphene oxide (GO) blend doped with ammonium triflate (NH₄CF₃SO₃) has been prepared via solution casting technique. The highest room temperature conductivity of the PEO-GO polymer electrolytes containing 35 wt.% NH₄CF₃SO₃ was found to be (2.48 ± 0.83) × 10^-6 S cm^-1.  This conductivity is comparable to our previous work for the system of PEO-GO-LiCF₃SO₃ at (3.84 ± 0.83) × 10^-6 S cm^-1. Fourier transmission infrared (FTIR) analysis exhibits the complexation between ammonium salt and polymer host. The FTIR spectra have been deconvoluted in the wavenumber region between 1010 and 1100 cm^-1 to determine the percentage of free triflate ion and ion aggregations. The results show that the number of free ions increases and attains maximum at 35 wt.% NH₄CF₃SO₃. The relaxation time of the electrolytes was found to decrease as the ionic conductivity at room temperature increased. Dielectric studies show that all electrolytes obeyed non-Debye behavior.

 

Keywords:  polymer electrolyte, PEO-GO blend, ammonium triflate, ionic conductivity, dielectric constant

 

Abstrak

Poli(etilena oksida) (PEO), polivinil alkohol (PVA), dan poli(etilena karbonat) merupakan polimer sintetik yang banyak digunakan sebagai polimer asas dalam elektrolit polimer pepejal (SPE). Sebagai sumber proton seperti litium triflate (LiCF₃SO₃), amonium bromida (NH₄Br), dan amonium fluorida (NH₄F) ditambah ke dalam campuran polimer untuk memberi ion Li⁺ atau H⁺. Pengadun polimer telah diperkenalkan untuk meningkatkan sifat-sifat SPE kerana penyediaannya yang mudah dan sifat fizikal yang sangat baik. Dalam kajian ini, SPE yang berasaskan campuran poli (etilena oksida) (PEO) - grafena oksida (GO) yang dengan tambahan amonium triflate (NH₄CF₃SO₃) telah disediakan melalui teknik pengacuan larutan. Kekonduksian pada suhu bilik tertinggi ialah bagi elektrolit polimer PEO-GO yang mengandungi 35% berat NH₄CF₃SO₃ iaitu pada (2.48 ± 0.83) × 10^-6 S cm^-1. Kekonduksian ini adalah setanding dengan kajian kami sebelum ini bagi sistem PEO-GO-LiCF₃SO₃ pada (3.84 ± 0.83) × 10^-6 S cm^-1. Analisis spektrometer inframerah (FTIR) mempamerkan kompleks antara garam ammonium dan polimer asas. Spektrum FTIR telah didikonvolutkan di antara 1010 dan 1100 cm^-1 untuk menentukan peratusan agregat ion dan ion triflat bebas. Keputusan menunjukkan bahawa bilangan ion bebas meningkat dan mencapai maksimum pada 35% berat NH₄CF₃SO₃. Masa kelonggaran elektrolit didapati berkurangan apabila kekonduksian ionik meningkat pada suhu bilik. Kajian dielektrik menunjukkan bahawa semua elektrolit mematuhi tingkah laku bukan Debye.

 

Kata kunci:  elektrolit polimer, campuran PEO-GO, amonium triflate, kekonduksian ionik, pemalar dielektrik

 

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