Current Density Distribution in Polymer Electrolyte Fuel Cells
Summary
Polymer electrolyte fuel cells (PEFCs) rely on uniform delivery and reaction of hydrogen and oxygen at electrode surfaces to achieve high performance and longevity. The spatial variation of current density across the membrane electrode assembly reflects local differences in reactant concentration, water content, temperature and material properties. Heterogeneous current distribution can induce localised dry-out, flooding, catalyst degradation and membrane stress, ultimately limiting efficiency and lifespan. Advances in measurement techniques—such as segmented cells, multilayer sensor arrays and electrochemical impedance mapping—coupled with computational fluid dynamics (CFD) and physics-based models have elucidated the interplay of mass transport, electrochemical kinetics and thermal management. Optimising channel geometry, gas diffusion layer characteristics and operating conditions mitigates inhomogeneities and enhances overall power density. A holistic understanding of current density distribution underpins the design of robust fuel cell systems for transport and stationary applications, supporting global decarbonisation efforts.
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Current Density Distribution in Polymer Electrolyte Fuel Cells publication trend
The graph below shows the total number of articles in current density distribution in polymer electrolyte fuel cells across all publications each year (not limited to Nature Index journals).
Technical terms
Current density distribution: Variation of electrical current per unit electrode area across the fuel cell active region.
Polymer electrolyte membrane: Ion-conductive polymer layer separating anode and cathode and facilitating proton transport.
Gas diffusion layer: Porous substrate that conveys reactants to and removes products from the catalyst layer.
Flow field: Network of channels in bipolar plates designed for uniform reactant supply and thermal regulation.
Electrochemical impedance spectroscopy: Frequency-domain technique probing resistive and capacitive processes within the cell.
Computational fluid dynamics (CFD): Numerical simulation method for modelling fluid flow, species transport and heat transfer.
References
- Nonuniform compensation of current density distribution in polymer electrolyte fuel cells by local heating. Energy Conversion and Management (2023).
- Computational Fluid Dynamic Investigation of Local Flow-Field Conditions in Lab Polymer Electrolyte Membrane Fuel Cells to Identify Degradation Stressors and Performance Enhancers. Energies (2024).
- Spatially Resolved Electrochemical Impedance Spectroscopy of Automotive PEM Fuel Cells. ChemElectroChem (2022).
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