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  4. Performance Analysis of a Segmented Along the Channel PEM Water Electrolysis Cell
 
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2025
Presentation
Title

Performance Analysis of a Segmented Along the Channel PEM Water Electrolysis Cell

Title Supplement
Presentation held at European Fuel Cell Forum (EFCF) 2025, Lucerne, Switzerland, July 2, 2025
Abstract
In laboratory-scaled PEM water electrolysis cells with an active area of only a few square centimeters a homogenous distribution of structural and operational parameters can be assumed. In industrial-scaled cells with several 1000 cm² active area and channel lengths > 30 cm this assumption is not valid. Water as the reactant is consumed and gas produced which accumulates along the supply channels of the cell leading to significant gradients in the water to gas ratio. To analyze such effects, we developed a segmented Along the Channel test cell with 30x2 cm active area (length x width) for current density, temperature and impedance measurements. The cell facilitates high current densities of 10 A∙cm-² and 10 bar balanced and differential pressure[1]. We investigate the cell performance along the channel with a special focus on mass transport related polarization phenomena when operating close to the stoichiometric level. A decreasing current density and less increasing temperature towards the cell outlet is detected when decreasing the water stoichiometry, see Figure 1 (left). Locally resolved impedance analysis reveals that the decreasing current density can be explained by increasing high frequency resistance (HFR) and low-frequency impedance along the channel which we refer to membrane dry-out and increase of mass transport resistances, see Figure 1 (right). With further analysis using Distribution of Relaxation time (DRT) we present a comprehensive analysis of performance-related phenomena occurring along the channel.
Author(s)
Hensle, Niklas
Fraunhofer-Institut für Solare Energiesysteme ISE  
Weber, André
Karlsruher Institut fürTechnologie (KIT), Institut für Angewandte Materialien (IAM)
Smolinka, Tom  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Conference
European Fuel Cell Forum 2025  
File(s)
Download (1.88 MB)
Rights
Use according to copyright law
DOI
10.24406/publica-5018
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • along the channel

  • electrochemical impedance spectroscopy

  • PEM water electrolysis

  • Segmentation

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