Electrochemical Energy Storage - EES -

The Electrochemical Energy Storage group studies batteries and electrolysers to integrate fluctuating renewable energies into the energy system. Building on projects regarding hydrogen storage and various fuel cell systems, they are currently concerned with PEM electrolysis systems and vanadium redox flow batteries. Individual components and systems are being optimised in close cooperation with academic chairs and industrial partners – always aiming to increase efficiency, maximise service life, and reduce costs.

The main work focuses are:

  • Investigation of electrochemical systems
  • PEM electrolysers
  • PEM electrolysers
  • Vanadium redox flow batteries
  • Analysis and further development of materials
  • Development of cell and stack designs for increased performance
  • Degradation measurement
  • Analysis of electrochemical systems in various applications

Head of Group:
Dr. Matthias Rzepka
Walther-Meißner-Str. 6
85748 Garching
Tel.: +49 89 329442-31
Fax: +49 89 329442-12

Deputy Head of Group:
Tobias Greese M.Sc.
Walther-Meißner-Str. 6
85748 Garching
Tel.: +49 89 329442-66
Fax: +49 89 329442-12

Services & Equipment


  • Analysis of PEM electrolysers and redox flow batteries
  • Further development of cell components (e.g. electrode materials)
  • Design and construction of individual cells and stacks
  • Production of membrane electrode assemblies (MEA)
  • Electrochemical characterisation of cell components
  • Analysis of loss mechanisms and performance measurements on individual cells and stacks (laboratory and industrial scale)
  • Catalyst screening
  • Investigation of catalyst degradation
  • Techno-economic modelling of storage systems in different applications
  • Modelling of charge and mass transport at cell level
  • Simulative analysis of ageing phenomena


  • PEM electrolysis testing systems
    • Laboratory cells and stacks for material testing
    • Stack testing rig for up to 10 cells, up to 600 A
    • Two individual cell testing rigs up to 30 A
    • Testing rig for water transport and catalyst degradation
    • Electrochemical impedance spectroscopy, current-voltage characterisation and cycle measurements in the entire DC range
  • Redox flow testing systems
    • Laboratory cells for material analyses
    • Measurement of stacks and prototypes up to 15 kW
    • Electrochemical impedance spectroscopy, current-voltage characteristics, and cycle measurements with state-of-charge and temperature control
  • Three-electrode measurement setup and rotating disk electrode (RDE) setup
  • Laboratory equipment for the analysis of electrolytes and pre-treatment of electrodes (plasma system, high-temperature furnaces)
  • Mass spectrometer for gas analysis
  • Redox flow models for system simulation (Matlab, Python)
  • COMSOL Multiphysics cell models for material and transport simulation as well as fluid simulation

ZAE Bayern

We conduct applied research at the interface between basic science and industrial application. Our methods and systems aim to achieve CO2 neutrality through the intelligent and efficient use of renewable energies.

Annual Report

Logo Klima-Allianz Bayern + Link zur Website
IHK Ausbildungsbetrieb