1. Department of Applied Physics, Eindhoven University of Technology, Eindhoven 5600 MB, The Netherlands
2. Department of Physical, Chemical and Natural Systems, University Pablo de Olavide, Ctra. Utrera km. 1, 41013 Seville, Spain
3. HyET Hydrogen B.V., Arnhem 6827 AV, The Netherlands
4. Stichting New Energy Coalition, Nijenborgh 6, 9747 AG Groningen, The Netherlands