Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Poster session II

MM 26.26: Poster

Dienstag, 8. März 2016, 18:30–20:30, Poster B3

Synthesis and electrochemical properties of orthorhombic α-MoO₃ and hexagonal h-MoO₃ nanostructures — •Christina Schmidt¹, Alexander Ottmann¹, Galina Zakharova², and Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, University of Heidelberg, Germany — ²Institute of Solid State Chemistry, Ural Division, Russian Academy of Sciences, Yekaterinburg, Russia

MoO₃ nanomaterials with either hexagonal or orthorhombic crystal structure have been synthesised by means of a microwave-assisted hydrothermal route. The different structures are obtained by varying the synthesis parameters, which also leads to different size and shape of the primary particles. Magnetisation studies by means of SQUID magnetometry allow assessing that less than 0.1 % of Mo⁵⁺-defects are present in the materials. The electrochemical properties of the different samples are studied by means of cyclic voltammetry and galvanostatic cycling, and are discussed with regard to the XRD, SEM and SQUID data. Cyclic voltammetry reveals reversible processes associated with the Mo⁶⁺/Mo⁵⁺ redox couple in the α-MoO₃ nanostructures. Galvanostatic cycling within the potential limits of 1.5- 3.5 V vs. Li/Li⁺ of α-MoO₃ nanorods shows an initial discharge capacity of 296 mA h g⁻¹ at 100 mA g⁻¹. In case of h-MoO₃ nanostructures, except for large irreversible initial effects, only low electrochemical activity is observed.