1. Electrochemistry Laboratory; Paul Scherrer Institut; CH-5232 Villigen-PSI Switzerland
2. Swiss Light Source; Paul Scherrer Institut; CH-5232 Villigen-PSI Switzerland
3. Institute for Biomedical Engineering; University and ETH Zurich; Gloriastrasse 35 CH-8092 Zurich Switzerland
4. Laboratory of Physical Chemistry; ETH Zurich; CH-8093 Zurich Switzerland