1. The Electrochemical CatalysisEnergy and Materials Science LaboratoryDepartment of ChemistryTechnical University Berlin 10623 Berlin Germany
2. Department of Materials Science and EngineeringCornell University Ithaca NY 14853 USA
3. Department of ChemistryUppsala UniversityÅngström LaboratoryUppsala University Box 538 75121 Uppsala Sweden
4. Ernst Ruska Center for Microscopy and Spectroscopy with ElectronsForschungszentrum Juelich GmbH 52425 Juelich Germany
5. Department of Interface ScienceFritz Haber Institute of the Max Planck Society 14195 Berlin Germany
6. Technische Universität BerlinCenter for Electron Microscopy (ZELMI) Straße des 17. Juni 135 10623 Berlin Germany