Electrochemical Performance of Multi Walled Carbon Nanotube and Graphene Composite Films Using Electrophoretic Deposition Technique Elyas Talib a , Kok-Tee Lau, Muhammad Zaimi, Mohd Shahril Amin Bistamam, Nor Syafira Abdul Manaf, Raja Noor Amalina Raja Seman, Nor Najihah Zulkapli, Mohd Asyadi Azam b Carbon Research Technology Research Group, Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka (UTeM), Hang Tuah Jaya, 76100, Durian Tunggal, Melaka, Malaysia a P051110009@student.utem.edu.my, b asyadi@utem.edu.my Keywords: Electrochemical performance, Multi walled carbon nanotube, Graphene, composite films, Electrophoretic deposition Abstract. This study aims to investigate multi-walled carbon nanotube and graphene composite thin films fabricated using cathodic electrophoretic deposition in aqueous solution. The deposition mechanism and films microstructure were investigated using the cyclic voltammetry (CV) and field emission scanning electron microscope. The depositions yield varied by the deposition time and deposition voltage. The composite films were studied for its application in the electrochemical capacitor. The electrochemical performance showed the capacitive behavior of the films in 6 M potassium hydroxide electrolyte. CV scans were verified from 0 to 1 V at different scan rates. The specific capacitance of 29 Fg -1 was achieved at the scan rate of 1 mVs -1 . Introduction The development of energy storage devices based on carbon nanotube (CNT) and graphene are under investigation due to their unique properties, such as electrical, mechanical, thermal properties and very large specific surface area [1-2]. CNT and graphene composite films attract special attention in varied applications in electrochemical capacitor (EC) [3], photovoltaic [4], biomedical [5], optical [6], and battery [7] devices. In the composite materials studies, CNT was incorporated between the graphene layers and prevented layers from aggregation and restacking. Many studies were focused on the development of new techniques for fabrication of CNT/graphene composite film [8]. Chemical vapor deposition (CVD) is widely used to deposit CNT and graphene layers sequentially [9]. However, this technique is complex, expensive and not suitable for large area substrate. Despite the remarkable success achieved in the CNT/graphene composite fabrication, there is a need for simple and flexible techniques to produce it, suitable for large area applications. Electrophoretic deposition (EPD) technique offers many advantages, such as uniformity of film, thickness of film and deposition rate of rigid control and the possibility of film formation on large surface substrate [10]. The cathodic EPD performs many advantages [11] compared to the anodic EPD, which can cause dissolution or oxidation of non-noble electrodes. As a result, the interfacial resistance at the substrate interface will be increased and the deposited film to the substrate will be reduced [12]. In addition, the cathodic EPD can also be combined with other electrochemical techniques, such as electrogenerated based method and electroplating of metals for the fabrication of composite film [11]. The goal of this study was to fabricate multi walled (MWCNT)/graphene composite films by the EPD technique. The significant finding was the efficient dispersion, a possibility of charging. The EPD process of MWCNT/ graphene using isopropyl alcohol (IPA) solution showed good film formation on the substrate. The fabrication of MWCNT/graphene composite films were achieved, which promises materials for the application in EC electrodes. Applied Mechanics and Materials Vol. 761 (2015) pp 468-472 Submitted: 19.11.2014 © (2015) Trans Tech Publications, Switzerland Accepted: 20.11.2014 doi:10.4028/www.scientific.net/AMM.761.468 All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of TTP, www.ttp.net. (ID: 103.26.74.254-06/03/15,06:00:43)