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HL: Fachverband Halbleiterphysik

HL 10: Functional materials I - Energy storage (organized by MM)

HL 10.2: Vortrag

Montag, 31. März 2014, 10:30–10:45, IFW A

Nano-Engineered Three-Dimensional Core/Shell Nanotube Arrays for Realizing High Performance Asymmetric Supercapacitors — •Fabian Grote, Liaoyong Wen, Huaping Zhao, and Yong Lei — Ilmenau University of Technology, Institute of Physics & IMN MacroNano (ZIK) Prof. Schmidt-Str. 26, 98693 Ilmenau

The ongoing technological advances in areas such as electric mobility, consumer electronics, and energy harvesting set new demands for energy storage systems. The next generation of high performance devices requires a strongly enhanced electrochemical performance as well as operating safety, limited environmental impact, and economic viability. In order to fulfill these aims a crucial role is addressed to supercapacitors. Today, the main challenge is to increase the specific energy of supercapacitors without sacrificing specific power. Thereby the development of novel functional nanostructures for energy storage is a key challenge. Hence we nano-engineered a complex 3D electrode material based on free-standing open-ended core/shell nanotube arrays with tailored functions, using anodic aluminum oxide nano-templates and atomic layer deposition. The core provides a well electron transport through the entire electrode matrix and the thin shell guarantees a well utilization of the active electrode material. Importantly, we designed and nanostructured both the negative and positive electrode materials individually, using an innovative material combination of polypyrrole and manganese oxide. It is shown that the asymmetric electrode nature of the prepared supercapacitor device enabled us to increase the cell voltage to 1.7 V, which is a major leap to increase the specific energy.