Dr Christoph Hartnig works at Chemetall GmbH and formerly headed research departments at both BASF Fuel Cell GmbH and the Center for Solar Energy and Hydrogen Research (ZSW), Germany. Dr Christina Roth is Professor for Renewable Energies at Technische Universität Darmstadt and Head of a Research Group at the Institute for Applied Materials - Energy Storage Systems, Karlsruhe Institute of Technology (KIT), Germany. The editors are well known for their research and work in the fields of low temperature fuel cell technology and materials characterisation.