1. Institute of Physical Chemistry, Splaiul Independentei 202, Bucharest 060021, Romania
2. Department of Inorganic Chemistry, University of Bucharest, Dumbrava Rosie 23, Bucharest 020464, Romania
3. Chemistry Department, University of California, Berkeley CA 94720, United States
4. SPIN Institute of Consiglio Nazionale delle Ricerche, L'Aquila 67100, Italy
5. Laboratory of Renewable Energies- Photovoltaics, R&D National Institute for Electrochemistry and Condensed Matter, Dr. A. Paunescu Podeanu Str. No. 144, RO- 300569 Timisoara, Romania