dc.contributor.advisor |
Sitinamaluwa HS |
|
dc.contributor.advisor |
Galpaya GDD |
|
dc.contributor.author |
Sandaruwani MKA |
|
dc.date.accessioned |
2022 |
|
dc.date.available |
2022 |
|
dc.date.issued |
2022 |
|
dc.identifier.citation |
Sandaruwani, M.K.A. (2022). Synthesis of porous graphene from Sri Lankan graphite for supercapacitor applications [Master's theses, University of Moratuwa]. Institutional Repository University of Moratuwa. http://dl.lib.uom.lk/handle/123/21395 |
|
dc.identifier.uri |
http://dl.lib.uom.lk/handle/123/21395 |
|
dc.description.abstract |
A feasible process to synthesize porous graphene with ultra-high surface area is
presented in this thesis. Graphene oxide (GO) was synthesized from Sri Lankan
graphite via the modified hummers method. Then, GO was subjected to a chemical
activation process to produce graphene with a mesoporous structure, where KOH was
used as the activation agent. The influence of the critical activation process parameters
on the specific surface area of graphene was studied. In this study, activation time at
60 min, activation temperature at 800 ℃ and KOH/GO mass ratio at 4 were identified
as the optimum activation parameters for high surface area. As an alternative route to
find the specific surface area (SSA), a dye adsorption based SSA calculation method
was followed, and the methylene blue adsorption kinetics were studied for that. Second
order kinetic model and Langmuir isotherms were the most suitable kinetic models for
the methylene blue adsorption onto porous graphene which were produced from Sri
Lankan vein graphite. A combined mathematical model of methylene blue number
(MBN) and iodine number (IN) was used to calculate the SSA for high accuracy. The
obtained optimum activated graphene sample showed a high specific surface area of
768.15 m
2
/g as measured from the dye adsorption method and it was verified by BET
analysis. Furthermore, methylene blue and Iodine adsorption methods are studied as a
low-cost and feasible method for surface area determination of porous graphene. The
high surface area of the obtained graphene would make it a promising material for
supercapacitor applications. The present study mainly focuses on the value addition to
Sri Lankan vein graphite trough the utilization of vein graphite as an electrode material
in electrochemical double layer capacitor (EDLC). |
en_US |
dc.language.iso |
en |
en_US |
dc.subject |
GRAPHENE OXIDE |
en_US |
dc.subject |
GRAPHENE |
en_US |
dc.subject |
SRI LANKAN GRAPHITE |
en_US |
dc.subject |
ELECTROCHEMICAL DOUBLE LAYER CAPACITOR |
en_US |
dc.subject |
MATERIALS SCIENCE - Dissertation |
en_US |
dc.title |
Synthesis of porous graphene from Sri Lankan graphite for supercapacitor applications |
en_US |
dc.type |
Thesis-Abstract |
en_US |
dc.identifier.faculty |
Engineering |
en_US |
dc.identifier.degree |
Master of Philosophy |
en_US |
dc.identifier.department |
Department of Materialsl Engineering |
en_US |
dc.date.accept |
2022 |
|
dc.identifier.accno |
TH5049 |
en_US |