What is it about?
This paper focuses on diagnostic and characterization techniques—specifically utilizing multi-segment fuel cell hardware—to measure spatially resolved voltage, current density, and Electrochemical Impedance Spectroscopy (EIS) across the active area of Polymer Electrolyte Membrane Fuel Cells (PEMFCs). It investigates how internal gradients in temperature, relative humidity, pressure, and reactant concentration trigger localized degradation during transient operations, such as start-up and shut-down (SU/SD) cycles.
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Why is it important?
Standard single-cell testing only measures overall voltage and current, which masks local hot spots, localized reactant starvation, and non-uniform water accumulation. These hidden spatial heterogeneities cause premature degradation, including platinum catalyst dissolution, electrochemically active surface area (ECSA) loss, and carbon support corrosion. Identifying these local failure modes is critical for optimizing flow-field designs and developing operational protocols that prolong fuel cell durability in automotive and stationary applications.
Perspectives
The authors emphasize that macroscopic cell performance is strongly governed by microscopic spatial variations across the membrane electrode assembly (MEA). By combining segmented cell diagnostic hardware with targeted accelerated stress testing (AST), researchers can establish standardized benchmark protocols. This multi-channel diagnostic approach transitions fuel cell testing from trial-and-error observation to precise, spatially resolved failure analysis.
Dr. Shankar Raman Dhanushkodi
University of British Columbia
Read the Original
This page is a summary of: Polymer Electrolyte Membrane Fuel Cells: Characterization and Diagnostics, ECS Meeting Abstracts, August 2014, The Electrochemical Society,
DOI: 10.1149/ma2014-02/21/1100.
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