Synthesis and characterization of sulfonated poly (ether ether ketone)/graphene oxide nanocomposite for polymer electrolyte membrane

The challenge of methanol crossover, which seriously occurred using commercial Nafion® membrane, urging the number of studies on the development of novel proton exchange membrane (PEM). The main objective of this research was to prepare and characterize sulfonated poly (ether ether) ketone (SPEEK)/g...

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Main Author:	Suhaimin, Nuor Sariyan
Format:	Thesis
Language:	English
Published:	2020
Subjects:	QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/102056/1/NuorSariyanSuhaiminPFS2020.pdf
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spelling	my-utm-ep.1020562023-07-31T07:32:01Z Synthesis and characterization of sulfonated poly (ether ether ketone)/graphene oxide nanocomposite for polymer electrolyte membrane 2020 Suhaimin, Nuor Sariyan QD Chemistry The challenge of methanol crossover, which seriously occurred using commercial Nafion® membrane, urging the number of studies on the development of novel proton exchange membrane (PEM). The main objective of this research was to prepare and characterize sulfonated poly (ether ether) ketone (SPEEK)/graphene oxide (GO) nanocomposite as PEM. The influences of oxidation conditions particularly oxidant ratio, reaction temperature, and oxidation time on the GO properties were investigated. GO prepared with loading ratio 1:3, at reaction temperature 35°C and oxidation time 5 days was found to be the optimum GO which demonstrated excellent desired properties which abundantly available hydroxyl and epoxide groups. A fully exfoliated GO with high graphitic integrity was confirmed by x-ray diffraction (XRD) and was supported by x-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscopy (FESEM). Subsequently, this optimized GO with various loading amounts was chosen to be incorporated into the SPEEK solution and further studied. The effect of GO filler incorporation was investigated based on their physicochemical properties such as ion exchange capacity (IEC), swelling behavior, activation energy, proton conductivity, and methanol permeability. A fully exfoliated GO in SPEEK matrix was confirmed by XRD and was supported by FESEM and transmission electron microscopy (TEM). Besides, the resultant SPEEK/GO nanocomposite membranes characteristics were compared with the blank SPEEK and commercially Nation®115 membranes. SPEEK/GO nanocomposite with 2.5 wt.% GO loading possessed a strong interfacial interaction between SPEEK matrix and GO fillers, which offered a high proton conductivity (0.13 S.cm-1) with lower methanol permeability (3.69 x 10-7.cm2s-1) compared to commercial Nation®115 membranes. Hence, owing to its promising improved characteristics and performance, SPEEK/GO0.25 had been identified as the best composite formulation for PEM. 2020 Thesis http://eprints.utm.my/id/eprint/102056/ http://eprints.utm.my/id/eprint/102056/1/NuorSariyanSuhaiminPFS2020.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:146030 phd doctoral Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Suhaimin, Nuor Sariyan Synthesis and characterization of sulfonated poly (ether ether ketone)/graphene oxide nanocomposite for polymer electrolyte membrane
description	The challenge of methanol crossover, which seriously occurred using commercial Nafion® membrane, urging the number of studies on the development of novel proton exchange membrane (PEM). The main objective of this research was to prepare and characterize sulfonated poly (ether ether) ketone (SPEEK)/graphene oxide (GO) nanocomposite as PEM. The influences of oxidation conditions particularly oxidant ratio, reaction temperature, and oxidation time on the GO properties were investigated. GO prepared with loading ratio 1:3, at reaction temperature 35°C and oxidation time 5 days was found to be the optimum GO which demonstrated excellent desired properties which abundantly available hydroxyl and epoxide groups. A fully exfoliated GO with high graphitic integrity was confirmed by x-ray diffraction (XRD) and was supported by x-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscopy (FESEM). Subsequently, this optimized GO with various loading amounts was chosen to be incorporated into the SPEEK solution and further studied. The effect of GO filler incorporation was investigated based on their physicochemical properties such as ion exchange capacity (IEC), swelling behavior, activation energy, proton conductivity, and methanol permeability. A fully exfoliated GO in SPEEK matrix was confirmed by XRD and was supported by FESEM and transmission electron microscopy (TEM). Besides, the resultant SPEEK/GO nanocomposite membranes characteristics were compared with the blank SPEEK and commercially Nation®115 membranes. SPEEK/GO nanocomposite with 2.5 wt.% GO loading possessed a strong interfacial interaction between SPEEK matrix and GO fillers, which offered a high proton conductivity (0.13 S.cm-1) with lower methanol permeability (3.69 x 10-7.cm2s-1) compared to commercial Nation®115 membranes. Hence, owing to its promising improved characteristics and performance, SPEEK/GO0.25 had been identified as the best composite formulation for PEM.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Suhaimin, Nuor Sariyan
author_facet	Suhaimin, Nuor Sariyan
author_sort	Suhaimin, Nuor Sariyan
title	Synthesis and characterization of sulfonated poly (ether ether ketone)/graphene oxide nanocomposite for polymer electrolyte membrane
title_short	Synthesis and characterization of sulfonated poly (ether ether ketone)/graphene oxide nanocomposite for polymer electrolyte membrane
title_full	Synthesis and characterization of sulfonated poly (ether ether ketone)/graphene oxide nanocomposite for polymer electrolyte membrane
title_fullStr	Synthesis and characterization of sulfonated poly (ether ether ketone)/graphene oxide nanocomposite for polymer electrolyte membrane
title_full_unstemmed	Synthesis and characterization of sulfonated poly (ether ether ketone)/graphene oxide nanocomposite for polymer electrolyte membrane
title_sort	synthesis and characterization of sulfonated poly (ether ether ketone)/graphene oxide nanocomposite for polymer electrolyte membrane
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2020
url	http://eprints.utm.my/id/eprint/102056/1/NuorSariyanSuhaiminPFS2020.pdf
_version_	1776100835492626432

Synthesis and characterization of sulfonated poly (ether ether ketone)/graphene oxide nanocomposite for polymer electrolyte membrane

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