1. Department of Physics, Technical University of Denmark, Kgs. Lyngby, Denmark
2. SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA
3. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
4. Columbia Electrochemical Energy Center, Department of Chemical Engineering, Columbia University, New York, New York 10027, USA
5. Department of Energy Conversion and Storage, Technical University of Denmark, Kgs. Lyngby, Denmark