Investigation Of The Heat Treatment Process To The Adhesion Of Graphene On Copper Foil For Prismatic Graphene Supercapacitor

Mohd Hizul Azri, Syahidatul Fatimah An-Nur (2019) Investigation Of The Heat Treatment Process To The Adhesion Of Graphene On Copper Foil For Prismatic Graphene Supercapacitor. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Conventional supercapacitors have low energy density which limits them from various applications that need devices with longer cycle time, hence, capacitor has been replaced with supercapacitor. Supercapacitor is one of energy storage device that has been used widely especially in portal electronics, electric vehicles and commercial household equipment. There are three types of supercapacitor which are Electric Double-Layer Capacitor (EDLC), Pseudocapacitor and Hybrid supercapacitor. In this study, the electrodes of EDLC supercapacitor has been extensively studied. Electrode materials of a supercapacitor determine the storage charge and capacity of a supercapacitor. Supercapacitors that utilized Activated Carbon (AC) as electrode materials have low electrochemical performances compare to graphene. This study reported a method for improving energy density of a supercapacitor by coating graphene slurry onto copper foil that act as supercapacitors electrode and. The electrodes were then tested with 3 different tests which are immersion test, Scanning Electron Microscopy (SEM) and Raman spectroscopy. For immersion test, the electrodes were immersed in 15ml of 6M potassium hydroxide (KOH) electrolyte for 15 minutes. The electrochemical characterization of the electrodes was further analyzed using cyclic voltammetry (CV) and by using the Wonatech 3000 WBS Potentiostat machine with 2 electrode system. The optimum value for temperature and annealing time in order to paste graphene onto copper foil was determined to ensure a better transfer of electricity. From immersion test, 4 out of 16 electrodes were compatible to be further tested in SEM and Raman spectroscopy. From this study, it can be concluded that the optimum temperature and duration in order to coat graphene onto copper foil is 100°C and 8hours respectively.

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