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Title: Transition-Metal-Oxide-Based Nanaostructures as Supercapacitor Electrodes
Keywords: Supercapacitor, transition metal oxide, manganese oxide, ruthenium oxide, reduced graphene oxide, capacitive performance
Issue Date: 13-Jan-2012
Citation: ZHANG JINTAO (2012-01-13). Transition-Metal-Oxide-Based Nanaostructures as Supercapacitor Electrodes. ScholarBank@NUS Repository.
Abstract: Supercapacitors, also known as ultracapacitors or electrochemical capacitors, are an important energy storage device, offering a number of advantages, such as high power rate and long cycle life. However, energy density of supercapacitors is lower than that of batteries and fuel cells. The evolution of nanostructured materials has greatly stimulated the development of supercapacitors. In thesis work, a couple of experimental approaches were developed to prepare transition-metal-oxide nanostructures and composite materials containing graphene. The chemical and physical properties of these materials were characterized by instrumental analysis such as XRD, XPS, TEM and SEM. Electrochemical methods were employed to evaluate the electrocapacitive performances. Moreover, both symmetric and asymmetric supercapacitors were configured and used to evaluate the device performance. The asymmetric supercapacitor exhibited improved energy and power densities than those of symmetric ones, which would be ascribed to the broadened potential window in an aqueous electrolyte.
Appears in Collections:Ph.D Theses (Open)

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