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<p>Optimizing oxygen-enriched air conditions is critical for enhancing the performance and durability of proton exchange membrane fuel cells (PEMFCs) in hydrogen–oxygen coupled energy systems. This study systematically investigates the influence of oxygen-enriched air on PEMFC durability, with a focus on quantifying degradation mechanisms under 45% oxygen concentrations. The durability test results showed that at 1000&#xa0;mA/cm<sup>2</sup>, distinct voltage decay rates were revealed: 166.9&#xa0;μV&#xa0;h<sup>−1</sup> for air-fed PEMFCs versus 112.9&#xa0;μV&#xa0;h<sup>−1</sup> for those operated with 45% oxygen-enriched air. This demonstrates a superior durability of oxygen-enriched operation. It is proved that oxygen-enriched operation mitigated catalyst layer degradation, while inducing higher hydrogen crossover current and interfacial defects at the membrane–catalyst interface, likely caused by humidity-driven mechanical stress and potential oxygen radical-induced membrane degradation. This work aims to provide some basic work for the potential application of PEMFCs operated with oxygen-enriched air in electric-hydrogen coupled energy systems.</p>

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Experiment evaluation of proton exchange membrane fuel cell with cathode gradient oxygen enriched supply

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Ziheng Wang,
  • Yuan Gao,
  • Xinjian Wang,
  • Tong Zhang

摘要

Optimizing oxygen-enriched air conditions is critical for enhancing the performance and durability of proton exchange membrane fuel cells (PEMFCs) in hydrogen–oxygen coupled energy systems. This study systematically investigates the influence of oxygen-enriched air on PEMFC durability, with a focus on quantifying degradation mechanisms under 45% oxygen concentrations. The durability test results showed that at 1000 mA/cm2, distinct voltage decay rates were revealed: 166.9 μV h−1 for air-fed PEMFCs versus 112.9 μV h−1 for those operated with 45% oxygen-enriched air. This demonstrates a superior durability of oxygen-enriched operation. It is proved that oxygen-enriched operation mitigated catalyst layer degradation, while inducing higher hydrogen crossover current and interfacial defects at the membrane–catalyst interface, likely caused by humidity-driven mechanical stress and potential oxygen radical-induced membrane degradation. This work aims to provide some basic work for the potential application of PEMFCs operated with oxygen-enriched air in electric-hydrogen coupled energy systems.