1. Electrochemical Energy Systems, IMTEK–Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
2. Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
3. University of Freiburg, Institute and FIT–Freiburg Center for Interactive Materials and Bioinspired Technologies, Georges-Köhler-Allee 105, 79110 Freiburg, Germany