1. Department of Chemical Sciences, Università di Napoli “Federico II”, Compl. Univ. Monte Sant’Angelo, via Cintia 21, 80126, Napoli, Italy
2. National Reference Centre for Electrochemical Energy Storage (GISEL) - INSTM, Via Giusti 9, 50121 Florence, Italy
3. ENEA, R. C. Casaccia, TERIN-PSU-ABI, Via Anguillarese 301, 00123, Rome, Italy
4. Department of Physics “Ettore Pancini”, Università di Napoli “Federico II”, Compl. Univ. Monte Sant’Angelo, via Cintia 21, 80126, Napoli, Italy