IN SITU growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement

Graphene is a unique two-dimensional carbon material having good conductivity, stable chemical properties, and good mechanical properties with large surface area (- 2600 M2 g). Due to the outstanding mechanical and electrical properties, graphene is proposed as an electrode material for supercapacit...

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Main Author:	Puteri Emme Marina, Mohamad
Format:	Thesis
Language:	English English English
Published:	2017
Subjects:	TP Chemical technology
Online Access:	http://umpir.ump.edu.my/id/eprint/20523/ http://umpir.ump.edu.my/id/eprint/20523/ http://umpir.ump.edu.my/id/eprint/20523/1/IN%20SITU%20growth%20redox-active%20iron-centered%20particles%20on%20graphene%20sheets%20for%20specific%20capacitance%20enhancement-Table%20of%20contents.PDF http://umpir.ump.edu.my/id/eprint/20523/2/IN%20SITU%20growth%20redox-active%20iron-centered%20particles%20on%20graphene%20sheets%20for%20specific%20capacitance%20enhancement-Abstract.PDF http://umpir.ump.edu.my/id/eprint/20523/11/IN%20SITU%20growth%20redox-active%20iron-centered%20particles%20on%20graphene%20sheets%20for%20specific%20capacitance%20enhancement-References.PDF

id	ump-20523
recordtype	eprints
spelling	ump-205232018-03-12T03:00:19Z http://umpir.ump.edu.my/id/eprint/20523/ IN SITU growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement Puteri Emme Marina, Mohamad TP Chemical technology Graphene is a unique two-dimensional carbon material having good conductivity, stable chemical properties, and good mechanical properties with large surface area (- 2600 M2 g). Due to the outstanding mechanical and electrical properties, graphene is proposed as an electrode material for supercapacitor applications. Nevertheless, graphene has issues where in the dry state it is tends to agglomerate which hindering its full capability in electrochemical performance. Therefore, an improvement is needed in order to resolve the re-stacking issue. In this study, a facile approach is proposed to enhance the specific capacitance of (N-methylpyrrolidone) NMP-exfoliated graphene. Redox-active nickel hexacyanoferrate (NiFeCN) nanoparticles were grown on the surface of graphene sheets using a co-precipitation method. Apart from the synergetic effect of graphene and NiFeCN in the specific capacitance enhancement, the NiFeCN nanoparticles served as the spacer for graphene sheets to prevent the agglomeration between graphene sheets. This combination performed as a hybrid composite nanomaterial which possessed both electrochemical double layer capacitor (EDLC) and pseudo capacitance. With the above motivation, a graphene-based nanocomposite material has been extensively studied in this thesis. All the materials examined were prepared via simple co-precipitation synthesis techniques with different range of composite ratios (NiFeCN/G-10, NiFeCNIG-25, NiFeCN/G-50, NiFeCNIG-75 and NiFeCNIG-90). Characterization has been done using Fourier transform infrared spectroscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy and field emission scanning electron microscope. Their electrochemical properties were evaluated for supercapacitors using three electrode system configurations. From this experiment, a nanocomposite at a ratio of 25: 75 (NiFeCN/G-25) is shown to have a very high specific capacitance of 113.5 F g-iwhich is 2 times higher than the NMP-exfoliated graphene (52 F g-i) and 6 times higher than the pure NiFeCN (18 F g-i). The findings suggest that the NiFeCN/graphene could be the potential candidate for supercapacitors electrode. The enhanced electrochemical performance of these nanocomposite materials could be attributed to the dual contributions of graphene and nanoparticles. The results of this study indicated the graphene nanocomposite has great potential for application to practical energy storage devices. 2017-01 Thesis NonPeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/20523/1/IN%20SITU%20growth%20redox-active%20iron-centered%20particles%20on%20graphene%20sheets%20for%20specific%20capacitance%20enhancement-Table%20of%20contents.PDF application/pdf en http://umpir.ump.edu.my/id/eprint/20523/2/IN%20SITU%20growth%20redox-active%20iron-centered%20particles%20on%20graphene%20sheets%20for%20specific%20capacitance%20enhancement-Abstract.PDF application/pdf en http://umpir.ump.edu.my/id/eprint/20523/11/IN%20SITU%20growth%20redox-active%20iron-centered%20particles%20on%20graphene%20sheets%20for%20specific%20capacitance%20enhancement-References.PDF Puteri Emme Marina, Mohamad (2017) IN SITU growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement. Masters thesis, Universiti Malaysia Pahang. http://iportal.ump.edu.my/lib/item?id=chamo:100064&theme=UMP2
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English English English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Puteri Emme Marina, Mohamad IN SITU growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement
description	Graphene is a unique two-dimensional carbon material having good conductivity, stable chemical properties, and good mechanical properties with large surface area (- 2600 M2 g). Due to the outstanding mechanical and electrical properties, graphene is proposed as an electrode material for supercapacitor applications. Nevertheless, graphene has issues where in the dry state it is tends to agglomerate which hindering its full capability in electrochemical performance. Therefore, an improvement is needed in order to resolve the re-stacking issue. In this study, a facile approach is proposed to enhance the specific capacitance of (N-methylpyrrolidone) NMP-exfoliated graphene. Redox-active nickel hexacyanoferrate (NiFeCN) nanoparticles were grown on the surface of graphene sheets using a co-precipitation method. Apart from the synergetic effect of graphene and NiFeCN in the specific capacitance enhancement, the NiFeCN nanoparticles served as the spacer for graphene sheets to prevent the agglomeration between graphene sheets. This combination performed as a hybrid composite nanomaterial which possessed both electrochemical double layer capacitor (EDLC) and pseudo capacitance. With the above motivation, a graphene-based nanocomposite material has been extensively studied in this thesis. All the materials examined were prepared via simple co-precipitation synthesis techniques with different range of composite ratios (NiFeCN/G-10, NiFeCNIG-25, NiFeCN/G-50, NiFeCNIG-75 and NiFeCNIG-90). Characterization has been done using Fourier transform infrared spectroscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy and field emission scanning electron microscope. Their electrochemical properties were evaluated for supercapacitors using three electrode system configurations. From this experiment, a nanocomposite at a ratio of 25: 75 (NiFeCN/G-25) is shown to have a very high specific capacitance of 113.5 F g-iwhich is 2 times higher than the NMP-exfoliated graphene (52 F g-i) and 6 times higher than the pure NiFeCN (18 F g-i). The findings suggest that the NiFeCN/graphene could be the potential candidate for supercapacitors electrode. The enhanced electrochemical performance of these nanocomposite materials could be attributed to the dual contributions of graphene and nanoparticles. The results of this study indicated the graphene nanocomposite has great potential for application to practical energy storage devices.
format	Thesis
author	Puteri Emme Marina, Mohamad
author_facet	Puteri Emme Marina, Mohamad
author_sort	Puteri Emme Marina, Mohamad
title	IN SITU growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement
title_short	IN SITU growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement
title_full	IN SITU growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement
title_fullStr	IN SITU growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement
title_full_unstemmed	IN SITU growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement
title_sort	in situ growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement
publishDate	2017
url	http://umpir.ump.edu.my/id/eprint/20523/ http://umpir.ump.edu.my/id/eprint/20523/ http://umpir.ump.edu.my/id/eprint/20523/1/IN%20SITU%20growth%20redox-active%20iron-centered%20particles%20on%20graphene%20sheets%20for%20specific%20capacitance%20enhancement-Table%20of%20contents.PDF http://umpir.ump.edu.my/id/eprint/20523/2/IN%20SITU%20growth%20redox-active%20iron-centered%20particles%20on%20graphene%20sheets%20for%20specific%20capacitance%20enhancement-Abstract.PDF http://umpir.ump.edu.my/id/eprint/20523/11/IN%20SITU%20growth%20redox-active%20iron-centered%20particles%20on%20graphene%20sheets%20for%20specific%20capacitance%20enhancement-References.PDF
first_indexed	2023-09-18T22:29:38Z
last_indexed	2023-09-18T22:29:38Z
_version_	1777416199449083904

IN SITU growth redox-active iron-centered particles on graphene sheets for specific capacitance enhancement

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