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O: Fachverband Oberflächenphysik
O 40: Solid-Liquid Interfaces
O 40.5: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster A
Model Studies on the Electrochemical Decomposition of [BMP][TFSA] on Au electrodes — •Dorothea Alwast1,2, Johannes Schnaidt1,2, Yeuk Ting Law1, and R. Jürgen Behm1,2 — 1Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany — 2Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, D-89069 Ulm, Germany
Metal-air batteries like Li-air or Mg-air batteries offer high specific energies and are therefore studied intensively at present. Due to their special physical and chemical properties, the use of ionic liquids (IL) as electrolyte is of great interest. Therefore, the electrochemical stability of these ILs plays a key role for the use in batteries. To gain a better understanding of the stability of the IL n-buthyl-n-methylpyrrolidinium-bis(trifluoromethylsulfonyl) imide ([BMP][TFSA]), its decomposition on Au electrodes is studied using a novel differential electrochemical mass spectrometry (DEMS) set-up. Using cyclic voltammetry, decomposition products of the TFSA anion (m/z = 69, CF3+; m/z = 64, SO2+) are detected at positive (oxidative) potentials. In contrast, the decomposition products of the cation occur when applying negative (reductive) potentials. The implications of these findings on the mechanism of the IL’s electrochemical decomposition as well as the influence of adding Li[TFSA], Mg[TFSA]2 and O2 to the system as model system for Li-air and Mg-air batteries, will be discussed.