1. Accumulator Materials Research (ECM) Zentrum für Sonnenenergie-und Wasserstoff-Forschung Baden-Württemberg (ZSW Helmholtzstraße 8 89081 Ulm Germany
2. Centre for Cooperative Research on Alternative Energies (CIC energiGUNE) Basque Research and Technology Alliance (BRTA) Alava Technology Park, Albert Einstein 48 01510 Vitoria-Gasteiz Spain