1. Electrochemistry Laboratory (LEC), Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI CH-5232, Switzerland
2. Laboratory of Biomolecular Research (LBR), Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI CH-5232, Switzerland
3. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm SE-106 91, Sweden
4. BASF SE, Ludwigshafen D-67056, Germany