        Matteo C. Romano a , Isabel Martínez b , Ramón Murillo b , Bjørnar Arstad c  Richard Blom c , Dursun Can Ozcan d , Hyungwoong Ahn d , Stefano Brandani d a Politecnico di Milano, Energy Department, via Lambruschini 4, 20156 Milano, Italy b Instituto de Carboquímica (ICB-CSIC), C/ Miguel Luesma Castán 4, 50018, Zaragoza, Spain c SINTEF Material and Chemistry, P.O. Box 124 Blindern, N-0314 Oslo, Norway d IMP-SEE, The University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JL, UK        