1. Departament de Química-Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona (UB), C/Martí i Franquès 1, E-08028 Barcelona, Spain
2. SUNCAT Center for Interface
Science and Catalysis, SLAC, National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
3. Department of Chemical Engineering, Stanford University, Stanford, California 94305, United
States