Segmented fuel cells.
Using segmented cell technology, local power differences across the flow field of PEM fuel cells can be made visible. This allows for a detailed breakdown of the electrochemical activities over the active cell area.
Segmented fuel cells divide the flow field of the cell into a variable number of isolated segments. During cell operation, they allow monitoring of parameters at each individual segment, enabling precise mapping of current and voltage distribution within the flow field. Additionally, each segment can be considered and analyzed in isolation, facilitating the identification and understanding of degradation mechanisms.
Segmented fuel cells significantly contribute to the advancement of computer simulations by providing localized insights into flow field dynamics. Based on the acquired data, simulation models can be further refined or existing physical stacks can be improved.
Visualization of power distribution in a 10-segment segmented PEMFC at different average current densities.
Why segmented PEMFCs?
01
Characterization of individual flow fields
Segmentation can be implemented with any flow field. The number and thus the resolution of the electrochemical activities across the flow field is determined by the customer.
04
Manufacturing
Our segmented test cells are produced in various ways that are closely coordinated with the customer. We place great emphasis on high data quality and an accurate representation of inhomogeneities across the flow field. To ensure the highest data quality, a specially developed current, voltage, and temperature acquisition concept is used at each segment, which minimizes electrical interactions even in demanding measurement setups. Thus, the data obtained can also serve as a basis for computer simulations.
02
Gain understanding of the flow field
Segmented cells contribute significantly to gaining a deep understanding of distributor and flow field structures. Inhomogeneities in power output caused by the flow field can lead to massive cell degradation—such problems can be uncovered through cell segmentation.
05
Spatially resolved data analysis
Not only can power inhomogeneities be uncovered with segmented test cells, but using impedance spectroscopy techniques, the causes of inefficiencies can be linked to the prevailing operating conditions. This can lead to valuable insights for developing optimized operating strategies.
03
Power inhomogeneities across the active area
On a cell with a 100 cm² active area, the power output is not evenly distributed. While some areas deliver up to 4 W/cm², other sections of the MEA only produce 1 W/cm². These inhomogeneities lead to local cell degradation, insufficient temperature distribution, and rapid aging of the cell membrane. Segmented fuel cells can be used to make these inhomogeneities visible.
06
Future versions
The segmentation of fuel cells has the potential to dissect the electrochemical processes within PEM fuel cells in detail. Based on the data obtained, it can not only increase the efficiency of the actual fuel cell system but also provide the ideal real-physical template for the development of computer simulations. It is foreseeable that segmented fuel cells will play a significant role in the further development and commercialization of PEM technology.