SKM 2023 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 38: Functional semiconductors for renewable energy solutions I

HL 38.4: Vortrag

Donnerstag, 30. März 2023, 10:15–10:30, POT 6

Coaxial Nanowire-in-Nanopore Arrays Enabling Anti-Agglomeration and Reliable Length Retention — •Chengzhan Yan, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany.

Nanowire arrays, a typical one-dimensional (1D) nanostructure used in energy storage systems, have significantly improved the electrochemical performance by optimizing the active material distribution and promoting the charge transport kinetics in energy storage systems. Notably, nanowire arrays with well-defined arrangements and high aspect ratios are of particular interest. To this end, one prevailing strategy is to combine ordered templates with wet chemical techniques. However, nanowires with high aspect ratios have a more severe tendency to agglomerate because of uneven capillary forces, which leads to poor arrangement reliability and degrades the electrochemical performance. Herein, the ultra-thin honeycomb alumina nanopores are constructed to ensure the structural stability of nanowire arrays, achieving a reliable quadrupling of the length. Based on the integrated nanowire-in-nanopore architecture, MnO2 and polypyrrole are further electrodeposited on these free-standing nanowires to form vertically aligned core-shell 1D nanostructure arrays as cathodes and anodes for micro-supercapacitors (MSCs). Attributed to the high specific surface area and low charge diffusion resistance, these MSCs attain remarkably improved energy density, rate performance and lifespan.