Preparation and properties of reduced graphene oxide for direct methanol fuel cell application

Reduced graphene oxide has recently attracted great attention due to its unique chemical and physical properties. In this study, reduced graphene oxide is introduced in direct methanol fuel cell application as this system had been delayed by several reasons which are related to the lack of materials...

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Main Author:	Abdul Halim, Farah Syuhada
Format:	Thesis
Language:	English
Published:	2014
Subjects:	QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/48853/25/FarahSyuhadaAbdulHalimMFS2014.pdf
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spelling	my-utm-ep.488532020-07-01T06:53:02Z Preparation and properties of reduced graphene oxide for direct methanol fuel cell application 2014-07 Abdul Halim, Farah Syuhada QD Chemistry Reduced graphene oxide has recently attracted great attention due to its unique chemical and physical properties. In this study, reduced graphene oxide is introduced in direct methanol fuel cell application as this system had been delayed by several reasons which are related to the lack of materials with good methanol permeability and conductivity properties. Therefore, the objective of this research is to develop and characterize a high conductive reduced graphene oxide as additive in membrane electrode assembly (MEA). Reduced graphene oxide was prepared using reduction of the oxide with different reducing agents and the degree of reducibility of the reducing agents used was compared in order to determine the alternative reducing agent to replace hydrazine. The reduced graphene oxide was successfully prepared from the pristine graphite by reductive precipitation of graphene oxide aqueous solution using sodium borohydride which acted as the reducing agent for 24 hours reaction time at room temperature. Subsequently, MEA from sulfonated poly (etherether ketone) (SPEEK) consists of reduced graphene oxide as additive was fabricated for direct methanol fuel cell (DMFC) performance testing. The physicochemical properties of the reduced graphene oxide were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), transmission electronmicroscopy (TEM) and conductivity measurement. The FTIR spectrum of the reduced graphene oxide shows that the carbonyl group was successfully removed and the reduced graphene oxide contains some water. The XRD spectrum shows reduced graphene oxide has hexagonal structured crystal with a sharp peak at 2θ = 26.4owhich can be assigned as 002 peak associated with reduced graphene oxide. The exhibited conductivity was in the range of 1.80 × 103 – 1.30 × 104 S m-1. TEM micrograph showed that reduced graphene oxide has multilayer structures. The DMFC performance of the blended reduced graphene oxide with SPEEK55 exhibited substantial improvement by 5 – 15% of open circuit voltage (OCV), initial voltage,power density, and stabilization period as compared to the commercial nafion membrane. In conclusion, reduced graphene oxide is a potential material as catalyst support in MEA and additive in SPEEK55 membrane to improve the DMFC performance. 2014-07 Thesis http://eprints.utm.my/id/eprint/48853/ http://eprints.utm.my/id/eprint/48853/25/FarahSyuhadaAbdulHalimMFS2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:83696 masters 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 Abdul Halim, Farah Syuhada Preparation and properties of reduced graphene oxide for direct methanol fuel cell application
description	Reduced graphene oxide has recently attracted great attention due to its unique chemical and physical properties. In this study, reduced graphene oxide is introduced in direct methanol fuel cell application as this system had been delayed by several reasons which are related to the lack of materials with good methanol permeability and conductivity properties. Therefore, the objective of this research is to develop and characterize a high conductive reduced graphene oxide as additive in membrane electrode assembly (MEA). Reduced graphene oxide was prepared using reduction of the oxide with different reducing agents and the degree of reducibility of the reducing agents used was compared in order to determine the alternative reducing agent to replace hydrazine. The reduced graphene oxide was successfully prepared from the pristine graphite by reductive precipitation of graphene oxide aqueous solution using sodium borohydride which acted as the reducing agent for 24 hours reaction time at room temperature. Subsequently, MEA from sulfonated poly (etherether ketone) (SPEEK) consists of reduced graphene oxide as additive was fabricated for direct methanol fuel cell (DMFC) performance testing. The physicochemical properties of the reduced graphene oxide were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), transmission electronmicroscopy (TEM) and conductivity measurement. The FTIR spectrum of the reduced graphene oxide shows that the carbonyl group was successfully removed and the reduced graphene oxide contains some water. The XRD spectrum shows reduced graphene oxide has hexagonal structured crystal with a sharp peak at 2θ = 26.4owhich can be assigned as 002 peak associated with reduced graphene oxide. The exhibited conductivity was in the range of 1.80 × 103 – 1.30 × 104 S m-1. TEM micrograph showed that reduced graphene oxide has multilayer structures. The DMFC performance of the blended reduced graphene oxide with SPEEK55 exhibited substantial improvement by 5 – 15% of open circuit voltage (OCV), initial voltage,power density, and stabilization period as compared to the commercial nafion membrane. In conclusion, reduced graphene oxide is a potential material as catalyst support in MEA and additive in SPEEK55 membrane to improve the DMFC performance.
format	Thesis
qualification_level	Master's degree
author	Abdul Halim, Farah Syuhada
author_facet	Abdul Halim, Farah Syuhada
author_sort	Abdul Halim, Farah Syuhada
title	Preparation and properties of reduced graphene oxide for direct methanol fuel cell application
title_short	Preparation and properties of reduced graphene oxide for direct methanol fuel cell application
title_full	Preparation and properties of reduced graphene oxide for direct methanol fuel cell application
title_fullStr	Preparation and properties of reduced graphene oxide for direct methanol fuel cell application
title_full_unstemmed	Preparation and properties of reduced graphene oxide for direct methanol fuel cell application
title_sort	preparation and properties of reduced graphene oxide for direct methanol fuel cell application
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/48853/25/FarahSyuhadaAbdulHalimMFS2014.pdf
_version_	1747817487701901312

Preparation and properties of reduced graphene oxide for direct methanol fuel cell application

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