1. Institute of Physical Chemistry, University of Innsbruck, Innrain 52c, A-6020 Innsbruck, Austria
2. Fritz-Haber Institute of the Max-Planck Society, Department of Inorganic Chemistry, Faradayweg 4–6, 14195 Berlin, Germany
3. Catalysis for Energy, Energy Materials In Situ Laboratory (EMIL), Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany