Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.62: Poster

Montag, 12. März 2018, 17:30–19:30, Poster B

Charge storage in β-FeSi₂ nanoparticle — •fangfei li¹, martin geller¹, hans orthner², hartmut wiggers², and axel lorke¹ — ¹Experimental Physics and CENIDE, University of Duisburg-Essen, Germany — ²Institute for Combustion and Gas Dynamics and CENIDE, University of Duisburg-Essen, Germany

The development of portable electronic devices drives the increasing demand for electrochemical energy storage with high energy density. Among various energy storage devices, supercapacitors provide a promising solution to fast charging and discharging.

Normally, supercapacitors work with liquid or solid electrolytes. Here, we present a non-toxic, environmentally friendly and cost-effective capacitor that works in gaseous atmosphere, such as water vapor. Unlike traditional parallel double plate capacitors, an interdigitated capacitor structure is employed. The active material, i.e., β-FeSi₂ nanoparticles are spin-coated onto the gold interdigitated structure, which is lithographically defined on SiO₂ substrate.

Compared to the bare electrodes without β-FeSi₂ nanoparticles, the β-FeSi₂ nanoparticles-coated capacitor exhibits an up to 3−4 orders of magnitude increased capacitance. Also, the capacitance of β-FeSi₂ capacitor that runs under dry air is negligible, compared with a capacitor that is operated in humid atmosphere. In this work, the charging and discharging mechanism is studied with cyclic voltammetry, X-ray photoelectron spectroscopy and capacitance-voltage measurement. Also, the possibility of working under other gaseous atmosphere, such as acetone, is explored.