1. Department of Chemistry, The Electrochemical Catalysis, Energy and Materials Science Laboratory, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
2. Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
3. Department of Chemical and Biological Engineering and the Clean Energy Research Center, University of British Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z3, Canada
4. Zentraleinrichtung Elektronenmikroskopie (ZELMI), Technische Universität Berlin, 10623 Berlin, Germany