All projects of the Otto Hahn Group Portable Energy Systems (PoES) deal with the analysis, the optimal design and the operation of portable electrical energy systems like fuel cells and batteries. The Portable Energy Systems group focuses on generating in-depth knowledge on the processes occurring and interacting with each other in energy systems and on limitations and stability issues of the systems by combining rigorous model-based analysis and experimental validation. The gained knowledge might be subsequently used to develop improved energy system concepts or operating modes. Although the processes within the contemplated energy systems differ, all are open systems with matter and heat being exchanged with the environment. As such they show a certain dependence on environmental conditions which may lead to malfunctions and even instability during operation; such limitations are a central research topic of the group.
The group's current research projects are Small Fuel Cell Systems, Alkaline Electrochemical Cells, and Analysis and Diagnosis of Fuel Cell State.
In the Small Fuel Cell Systems project, the media management of fuel cell systems is investigated at various hierarchical levels. Studies of complete systems are complemented by detailed
investigations on key system components and their stabilizing effect in the system. Joint research with the MPI's research groups has been conducted on energy harvesting
(ESB group: Dr.
Grammel) as a part of the institute's Vision 2015+ initiative and on hybrid control for energy systems
Direct Methanol Fuel Cell Systems
Alkaline Direct Methanol Fuel Cells
Diagnosis of Fuel Cell States