1. Laboratory of Catalysis and Surface Chemistry, Institute of Physical Chemistry “Ilie Murgulescu”, Academia Romana, 202 Splaiul Independentei, 060021 Bucharest, Romania
2. Electrochemical Energy Storage Department, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
3. Laboratory of Oxide Materials Science, Institute of Physical Chemistry “Ilie Murgulescu”, Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania