We report a simple wet-chemical process to prepare porous CuO nanobelts (NBs) with high surface area and small crystal grains. These CuO NBs were mixed with carbon nanotubes in an appropriate ratio to fabricate pseudocapacitor electrodes with stable cycling performances, which showed a series of high energy densities at different power densities, for example, 130.2, 92, 44, 25, and 20.8 W h kg(-1) at power densities of 1.25, 6.25, 25, and 50 k Wh kg(-1), respectively. CuO-on-single-walled carbon nanotube (SWCNT) flexible hybrid electrodes were also fabricated using the SWCNT films as current collectors. These flexible electrodes showed much higher specific capacitance than that of electrodes made of pure SWCNTs and exhibited more stable cycling performance, for example, effective specific capacitances of >62 F g(-1) for the hybrid electrodes after 1000 cycles in 1 M LiPF6/EC:DEC at a current density of 5 A g(-1) and specific capacitance of only 23.6 F g(-1) for pure SWCNT electrodes under the same testing condition.
I would like to take this opportunity to acknowledge all those who have offered his/her guidance, support and assistance during my study. First of all, I would like to express my sincere gratitude to my supervisor, Assoc. Prof. Hng Huey Hoon, for her invaluable advice, encouragement and full support throughout the course of my study. A/P Hng had taken time off from her busy schedule to guide and advise the author, providing timely and useful insights leading to the successful completion of the project. The author is appreciative of the supportive and accommodating role that she had played in the author's research endeavour. I would also like to thank Assoc. Prof. Alex Yan Qingyu for his guidance, support and assistance during the course of my study and also the rest of members of MSE staff, especially technicians of electron microscopy & X-ray diffraction lab, the organic and inorganic synthesis labs, the computer lab, the central chemical and consumable stores. My special appreciation to all my fellow group members. I'm especially thankful to Fan Shufen, Liu Weiling, Sim Daohao, and Tan Li Ping for the numerous useful discussions, encouragement, and assistance during my research. Finally, I would like to thank my parents and sisters for their unfailing love, understanding and encouragement throughout the duration of my study.
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