SKM 2023 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 29: Interfaces and Thin Films

CPP 29.11: Vortrag

Mittwoch, 29. März 2023, 12:30–12:45, MER 02

Investigation of Mg(0001) and Mg(1010) surfaces in Grignard electrolytes by reflection anisotropy spectroscopy — •Mario Löw1, Holger Euchner2, and Matthias M. May1,21Universität Ulm, Institute of Theoretical Chemistry, 89081 Ulm, Germany — 2Universität Tübingen, Institute of Physical and Theoretical Chemistry, 72076 Tübingen, Germany

The high abundance and large volumetric capacity of the metal anode make rechargeable magnesium batteries potential candidates for future battery technologies. While understanding and controlling the electrode-electrolyte interface is essential for battery performance, there is often little known about the underlying atomistic interface structure under operating conditions [1].

To address this issue for the case of Mg, we study single crystalline magnesium surfaces in contact with standard Grignard electrolytes and under applied potential [2]. We employ reflection anisotropy spectroscopy (RAS) as an optical, high-resolution technique for the operando investigation of the interfacial structure as a function of the applied electrode potential. The Mg-crystal surface is studied in various solvents and Grignard electrolytes during voltammetric cycling. Finally, we seek comparison to theoretical spectra obtained within the random phase approximation.

[1] Popovic, Jelena. Nature Communications 12.1 (2021): 1-5.

[2] Lu, Z., et al. Journal of Electroanalytical Chemistry 466.2 (1999): 203-217.

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