1. Laboratory of Industrial Chemistry, Ruhr University Bochum, D-44780 Bochum, Germany, Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, D-14195 Berlin, Germany, Lehrstuhl für Physikalische Chemie I, Ruhr University Bochum, D-44780 Bochum, Germany, and Material Science and Testing, University of Applied Sciences Gelsenkirchen, D-45877 Gelsenkirchen, Germany