1. Helmholtz Institute Ulm (HIU); Electrochemistry I; Helmholtzstr. 11 89081 Ulm Germany
2. Karlsruhe Institute of Technology (KIT); P.O. Box 3640 76021 Karlsruhe Germany
3. Present address: Energy Storage and Distributed Resources Division; Lawrence Berkeley National Laboratory; 1 Cyclotron Road Berkeley CA 94720 USA
4. CIC energiGUNE Parque Tecnológico de Álava; Albert Einstein 48 01510 Miñano Álava Spain