Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 14: Functional Materials - Hydrogen
MM 14.1: Vortrag
Montag, 11. März 2013, 15:45–16:00, H26
Design and synthesis of core/shell SnO2/MnO2 nanotube arrays for high performance supercapacitor application — •Fabian Grote, Huaping Zhao, Ranjith Vellacheri, and Yong Lei — Fachgebiet 3D-Nanostrukturierung, Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, Prof. Schmidt Str. 26, 98693 Ilmenau, Germany.
Recently, we focused on the development of nanostructured three-dimensional electrode materials for applications in supercapacitor devices. Therefore, we developed a synthesis process to fabricate nanostructured free-standing core/shell SnO2/MnO2 nanotube arrays. The core/shell nanotube arrays were prepared by atomic layer deposition (ALD) of SnO2 into porous alumina membranes and a subsequent coating by MnO2. The essential features of this structure are its high surface area, hollow nature of the structure, good conformal coating of the SnO2 nanotubes with MnO2, and the desired core/shell structure. The electrochemical performance of the prepared electrodes was studied in CV, charge/discharge, and long-term cycle stability experiments and exhibited excellent performance. These results so far address key challenges of supercapacitors and shall pave the way to realize a high performance supercapacitor with not only high power density, but also high energy density. For further investigation the morphology of the core/shell SnO2/MnO2 nanotube arrays was analyzed by SEM and TEM. The chemical composition was determined by XPS, EELS, and XRD measurements.