Preparation Of Graphene/Molybdenum Disulfide Based Electrodes And Its Electrochemical Performance In Supercapacitors

Preparation Of Graphene/Molybdenum Disulfide Based Electrodes And Its Electrochemical Performance In Supercapacitors

Supercapacitor is highly promising energy device due to its electrical charge storage performance and significant lifecycle ability. Construction of the supercapacitor cell especially its electrode fabrication is critical to ensure great application performance. The purpose of this research is to fa...

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Main Author: Raja Seman, Raja Noor Amalina
Format: Thesis
Language:English
English
Published: 2019
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T Technology (General)
Online Access:http://eprints.utem.edu.my/id/eprint/24857/1/Preparation%20Of%20Graphenemolybdenum%20Disulfide%20Based%20Electrodes%20And%20Its%20Electrochemical%20Performance%20In%20Supercapacitors.pdf
http://eprints.utem.edu.my/id/eprint/24857/2/Preparation%20Of%20Graphenemolybdenum%20Disulfide%20Based%20Electrodes%20And%20Its%20Electrochemical%20Performance%20In%20Supercapacitors.pdf
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institution Universiti Teknikal Malaysia Melaka
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advisor Mohd Abid, Mohd Asyadi 'Azam
topic T Technology (General)
T Technology (General)
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T Technology (General)
Raja Seman, Raja Noor Amalina
Preparation Of Graphene/Molybdenum Disulfide Based Electrodes And Its Electrochemical Performance In Supercapacitors
description Supercapacitor is highly promising energy device due to its electrical charge storage performance and significant lifecycle ability. Construction of the supercapacitor cell especially its electrode fabrication is critical to ensure great application performance. The purpose of this research is to fabricate the molybdenum disulfide (MoS2), graphene and G/MoS2 hybrid electrode and their usage as symmetric and asymmetric supercapacitors. The electrode was prepared by using a simple and facile slurry technique. By this, XRD was used to analyze the crystal phase and structure of the as-prepared graphene, MoS2, and G/ MoS2 hybrid. The peaks at 14.3°, 33.8°, and 57.5° are attributed to the (002), (100), and (110) plane of MoS2 crystal. From Raman spectroscopy shows the characteristic peaks of graphene (D, G and 2D) and MoS2 (E12g band at 377 cm-1 and A1g band at 403 cm-1) are retained in the Raman spectra of G/MoS2 which can confirm the fact that the hybrid of G/MoS2 is composed of MoS2 and graphene. Next, the XPS analysis was carried out to deduce the exact elemental composition of the G/MoS2. The full scan of the G/MoS2 gives the characteristic peaks for Mo 3d, S 2p, C ls and 0 ls with their corresponding binding energies. The morphologies and microstructures of the MoS2, graphene and G/MoS2 are systematically characterized by FESEM observation. The high resolution of FESEM image further reveals that the MoS2 structures are constructed with layers of nanosheets. Meanwhile, FESEM image of graphene sheets illustrating the uniformly distributed of graphene into the Ni foam. Also, the inclusion of MoS2 nanosheets resulted in a rough surface, logically due to co-stacking of MoS2 nanosheets over the graphene nanosheets. Further, the morphology of the G/MoS2 was examined by TEM and reveals the crystal lattice structure of MoS2 and graphene in G/MoS2. The interlayer spacing of MoS2 in the hybrid were estimated to be -0.63 nm, which can be indexed to their (002) lattice planes of hexagonal phase of MoS2. Regardless of the difference in electrode being used, cyclic voltammetry (CV) analysis from the supercapacitor depicted a relatively good specific gravimetric capacitance (Csp) and rate capability performance. A nearly rectangular-shaped CV curve was observed even at high scan rate. Besides, from the charge-discharge measurement, the symmetrical triangular curves reveal that there is no IR drops or voltage drops because oflow internal resistance in the electrodes. Also, the electrode shows excellent discharge behavior and good capacitance retention of up to 10,000 cycles. Thus, this 2D heterostructures may provide excellent rate capabilities, high capacitance, and long lifecycle energy device. This is very promising for the development of high energy and high power density of device for multi-scale applications or industries.
format Thesis
qualification_name Doctor of Philosophy (PhD.)
qualification_level Doctorate
author Raja Seman, Raja Noor Amalina
author_facet Raja Seman, Raja Noor Amalina
author_sort Raja Seman, Raja Noor Amalina
title Preparation Of Graphene/Molybdenum Disulfide Based Electrodes And Its Electrochemical Performance In Supercapacitors
title_short Preparation Of Graphene/Molybdenum Disulfide Based Electrodes And Its Electrochemical Performance In Supercapacitors
title_full Preparation Of Graphene/Molybdenum Disulfide Based Electrodes And Its Electrochemical Performance In Supercapacitors
title_fullStr Preparation Of Graphene/Molybdenum Disulfide Based Electrodes And Its Electrochemical Performance In Supercapacitors
title_full_unstemmed Preparation Of Graphene/Molybdenum Disulfide Based Electrodes And Its Electrochemical Performance In Supercapacitors
title_sort preparation of graphene/molybdenum disulfide based electrodes and its electrochemical performance in supercapacitors
granting_institution Universiti Teknikal Malaysia Melaka
granting_department Faculty of Manufacturing Engineering
publishDate 2019
url http://eprints.utem.edu.my/id/eprint/24857/1/Preparation%20Of%20Graphenemolybdenum%20Disulfide%20Based%20Electrodes%20And%20Its%20Electrochemical%20Performance%20In%20Supercapacitors.pdf
http://eprints.utem.edu.my/id/eprint/24857/2/Preparation%20Of%20Graphenemolybdenum%20Disulfide%20Based%20Electrodes%20And%20Its%20Electrochemical%20Performance%20In%20Supercapacitors.pdf
_version_ 1747834097740283904
spelling my-utem-ep.248572022-03-15T14:48:07Z Preparation Of Graphene/Molybdenum Disulfide Based Electrodes And Its Electrochemical Performance In Supercapacitors 2019 Raja Seman, Raja Noor Amalina T Technology (General) TK Electrical engineering. Electronics Nuclear engineering Supercapacitor is highly promising energy device due to its electrical charge storage performance and significant lifecycle ability. Construction of the supercapacitor cell especially its electrode fabrication is critical to ensure great application performance. The purpose of this research is to fabricate the molybdenum disulfide (MoS2), graphene and G/MoS2 hybrid electrode and their usage as symmetric and asymmetric supercapacitors. The electrode was prepared by using a simple and facile slurry technique. By this, XRD was used to analyze the crystal phase and structure of the as-prepared graphene, MoS2, and G/ MoS2 hybrid. The peaks at 14.3°, 33.8°, and 57.5° are attributed to the (002), (100), and (110) plane of MoS2 crystal. From Raman spectroscopy shows the characteristic peaks of graphene (D, G and 2D) and MoS2 (E12g band at 377 cm-1 and A1g band at 403 cm-1) are retained in the Raman spectra of G/MoS2 which can confirm the fact that the hybrid of G/MoS2 is composed of MoS2 and graphene. Next, the XPS analysis was carried out to deduce the exact elemental composition of the G/MoS2. The full scan of the G/MoS2 gives the characteristic peaks for Mo 3d, S 2p, C ls and 0 ls with their corresponding binding energies. The morphologies and microstructures of the MoS2, graphene and G/MoS2 are systematically characterized by FESEM observation. The high resolution of FESEM image further reveals that the MoS2 structures are constructed with layers of nanosheets. Meanwhile, FESEM image of graphene sheets illustrating the uniformly distributed of graphene into the Ni foam. Also, the inclusion of MoS2 nanosheets resulted in a rough surface, logically due to co-stacking of MoS2 nanosheets over the graphene nanosheets. Further, the morphology of the G/MoS2 was examined by TEM and reveals the crystal lattice structure of MoS2 and graphene in G/MoS2. The interlayer spacing of MoS2 in the hybrid were estimated to be -0.63 nm, which can be indexed to their (002) lattice planes of hexagonal phase of MoS2. Regardless of the difference in electrode being used, cyclic voltammetry (CV) analysis from the supercapacitor depicted a relatively good specific gravimetric capacitance (Csp) and rate capability performance. A nearly rectangular-shaped CV curve was observed even at high scan rate. Besides, from the charge-discharge measurement, the symmetrical triangular curves reveal that there is no IR drops or voltage drops because oflow internal resistance in the electrodes. Also, the electrode shows excellent discharge behavior and good capacitance retention of up to 10,000 cycles. Thus, this 2D heterostructures may provide excellent rate capabilities, high capacitance, and long lifecycle energy device. This is very promising for the development of high energy and high power density of device for multi-scale applications or industries. 2019 Thesis http://eprints.utem.edu.my/id/eprint/24857/ http://eprints.utem.edu.my/id/eprint/24857/1/Preparation%20Of%20Graphenemolybdenum%20Disulfide%20Based%20Electrodes%20And%20Its%20Electrochemical%20Performance%20In%20Supercapacitors.pdf text en public http://eprints.utem.edu.my/id/eprint/24857/2/Preparation%20Of%20Graphenemolybdenum%20Disulfide%20Based%20Electrodes%20And%20Its%20Electrochemical%20Performance%20In%20Supercapacitors.pdf text en validuser https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=117098 phd doctoral Universiti Teknikal Malaysia Melaka Faculty of Manufacturing Engineering Mohd Abid, Mohd Asyadi 'Azam 1. Acerce, M., Voiry, D. and Chhowalla, M., 2015. Metallic IT Phase MoS2 Nanosheets as Supercapacitor Electrode Materials. Nature Nanotechnology, 10, pp. 3 13-3 18. 2. 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