Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/19121
Title: Carbon-Based Materials as Supercapacitor Electrodes
Authors: ZHANG LI LI
Keywords: supercapacitor, carbon, electrode, graphene, polymer, composite
Issue Date: 12-Aug-2010
Source: ZHANG LI LI (2010-08-12). Carbon-Based Materials as Supercapacitor Electrodes. ScholarBank@NUS Repository.
Abstract: Standing as a bridge between high-power-output conventional capacitors and high-energy-density batteries, supercapacitors (also known as ultracapacitors or electrical double layer capacitors) are an ideal electrochemical energy-storage system suitable for rapid storage and release of energy. However, the relatively much lower energy density of supercapacitors than that of batteries has largely limited the application of the former. This thesis work is aimed to design and prepare novel carbon-based materials with high-energy and high-power densities and long cycle life. A series of carbon-based materials, ranging from three-dimensional (3D) interconnected macropororous carbons to two-dimensional (2D) graphene-based architectures have been investigated as supercapacitor electrodes. Microporous carbon materials doped with manganese oxide and nitrogen were also prepared. The results showed that 3D interconnected porous structure provide a fast ion transportation pathway for electrolyte ions. The presence of micropores and the effective utilization of electro-active materials are essential in realizing high-energy density supercapacitors. Novel 2D carbon nanostructures were prepared by pillaring graphene and graphene oxide sheets with carbon nanotubes and conducting polymers. Extremely high energy densities (as high as 70 Wh kg-1 at a power density of 1 kW kg-1 and 50 Wh kg-1 at a power density of 2 kW kg-1 based on a single-electrode cell) have been realized on these new carbon nanostructures.
URI: http://scholarbank.nus.edu.sg/handle/10635/19121
Appears in Collections:Ph.D Theses (Open)

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