Regensburg 2016 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 13: Nano- and microstructured dielectrics/thin films (DF with KR)

DF 13.7: Vortrag

Donnerstag, 10. März 2016, 11:50–12:10, H26

Implanted Strontium Titanate Single Crystals for Energy Storage Applications — •Max Stöber¹, Charaf Cherkouk¹, Juliane Walter¹, Matthias Schelter², Jens Zosel², Ralph Strohmeyer¹, Slawomir Prucnal³, Tilmann Leisegang¹, and Dirk Carl Meyer¹ — ¹TU Bergakademie Freiberg — ²Kurt Schwabe Institute Meinsberg — ³Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf,

A rapid increase of the demand on efficient energy storage solutions requires new approaches beyond the Li-ion technology. In particular, metal-air batteries as well as solid-state fuel cells offer a great potential for high-energy-density storage devices. Since the efficiency of such devices is significantly limited by the activation of both the oxygen reduction reaction (ORR) and the ionic and electronic conductivities, an adequate porosity as well as a controlled doping are required. The ion implantation is a key technology to achieve this goal. In this work, p- and n-doped strontium titanate (SrTiO₃) single crystals were used as oxidic materials. The oxygen exchange kinetics as well as the structural changes of the SrTiO₃ crystal surface induced by the ion implantation were investigated. On one hand, the depth profile of dopant concentration and dopant valence state were determined using sputtered X-ray photoelectron spectroscopy (XPS). On the other hand, the overall oxygen exchange kinetic of the implanted SrTiO₃ crystal was quantitatively described by means of coulometric titration using Zirox system (ZIROX GmbH, Germany). Furthermore, the surface morphology of the samples was investigated using atomic force microscopy (AFM).