determine current density with DiLiCo

Characterization of materials, operating strategies and aging effects

Application

Measure and analyze current density and temperature distribution. Evaluate operating strategies, aging effects and stack components by determining the distribution of current density and temperature over the active cell area.

Technical data

Current density: Up to ± 6 A
Number of segments customized
Temperature Up to 175 °C
Communication: RS232 or CAN
Sensorlayer: Adaptable to your specifications
PDF Datasheet download
Sent request Delivery time: 8 weeks

Specifications

By measuring current density and temperature distribution, the activity of the membrane can be analyzed and the design of bipolar plates, gaskets and other components evaluated. DiLiCo current density offers a valuable insight into the interior of the fuel cell and electrolyzer. Use the information to optimize the operation and characterization of your system. Depending on the membrane surface, the sensor layer, number of segments and distribution of the segments can be individually adjusted to your requirements in order to obtain optimal observation of the current density and temperature distribution.

Delivery

  • Sensor layer
  • Evaluation electric
  • External power supply
  • Visualization software
  • Instructions

User

  • Manufacturer of fuel cells and electrolyzers
  • Manufacturer of stack components and bipolar plates
  • Test systems, systems in the field test and stationary energy supply
  • Research institutions

Why it makes sense to measure current densities in fuel cells?

  • Identification of partial undersupply over the membrane surface, which can not be recognized by the cell voltage.
  • Recognition of local aging breakthroughs in certain membrane areas.
  • To compare different material and design configurations.
  • Evaluation of the contact resistance of bipolar plate, gas diffusion layer, seal and membrane-electrode unit for different contact pressures of the stack.
  • Statements on the quality of the gas distribution of flow fields.
  • Optimization of operating parameters by evaluation and adaptation of cell components.
  • Identification of flooding and drying conditions.
  • Data usage for modeling and extension.

What additional insights can the measurement of the current density provide?

Example: Successive flooding of the fuel cell within 60 seconds at a constant current after reducing the speed of the H2 recirculation pump.


The current density of the membrane areas at the media inlet increase by the value that the current density in the direction of the media outlet drops along the flow channel during the flooding. The membrane in the entrance area now makes up to 600 mA / cm² (previously 470 mA / cm²) compared to about 380 mA / cm² at the output (previously 520 mA / cm²). A connection between the speed of the recirculation pump and the changed humidity conditions in the output areas of the flow fields could be deduced.