1. Department of Materials, Henry Royce Institute and National Graphene Institute, The University of Manchester, Oxford Road, Westminster M13 9PL, U.K.
2. Carbon Science Center of Excellence, Morgan Advanced Materials and Technology, Inc., 310 Innovation Boulevard, Technology Center, Suite 250, University Park, Pennsylvania 16803, United States.
3. Foundation for Research and Technology Hellas, Institute for Chemical Engineering Sciences, Stadiou Street, Platani, Patras GR26504, Greece
4. Department of Chemical Engineering, University of Patras, Patras 26504, Greece