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Recently, research has been conducted on the installation of polymer electrolyte fuel cells (PEFCs) in heavy-duty vehicles. The PEFC stacks become large, as well as the heat produced during operation; a higher operating temperature is necessary to increase the power generation density and to reduce the size/weight of radiators for cooling the PEFCs. To increase the operating temperature, the operating pressure in the PEFCs must be controlled to avoid dryout of the proton exchange membrane (PEM) and flooding in the PEFCs. Therefore, it is crucial to evaluate the water transport in PEFCs under these conditions. In this study, visualization of the water distribution in a PEFC at an operating temperature of 105 ℃ using neutron radiography was performed by changing the operating pressure. Two-dimensional water distribution was measured every 30 s during the operation. When the operating pressure was atmospheric pressure, the current density could not be increased more than 0.6 A/cm2 due to the PEM dryout. However, the operatable current density could be increased to 1.0 A/cm2 at 250 kPaG, and water accumulation was clearly confirmed in the flow channels. To analyze the time variation of area-average water thickness, it was confirmed that the lowering of the cell performance was caused by liquid plug formation.

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Visualization of Liquid Water Behavior in a Polymer Electrolyte Fuel Cell Under High-Temperature Operation Using a Neutron Radiography

  • 会议论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年

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  • Yuto Obayashi,
  • Hideki Murakawa,
  • Katsufumi Nakagawa,
  • Katsumi Sugimoto,
  • Hitoshi Asano,
  • Yuto Shirase,
  • Christopher Schreiber,
  • Solomon Wakolo,
  • Eric Dzramado,
  • Junji Inukai,
  • Daisuke Ito,
  • Naoya Odaira,
  • Yasushi Saito

摘要

Recently, research has been conducted on the installation of polymer electrolyte fuel cells (PEFCs) in heavy-duty vehicles. The PEFC stacks become large, as well as the heat produced during operation; a higher operating temperature is necessary to increase the power generation density and to reduce the size/weight of radiators for cooling the PEFCs. To increase the operating temperature, the operating pressure in the PEFCs must be controlled to avoid dryout of the proton exchange membrane (PEM) and flooding in the PEFCs. Therefore, it is crucial to evaluate the water transport in PEFCs under these conditions. In this study, visualization of the water distribution in a PEFC at an operating temperature of 105 ℃ using neutron radiography was performed by changing the operating pressure. Two-dimensional water distribution was measured every 30 s during the operation. When the operating pressure was atmospheric pressure, the current density could not be increased more than 0.6 A/cm2 due to the PEM dryout. However, the operatable current density could be increased to 1.0 A/cm2 at 250 kPaG, and water accumulation was clearly confirmed in the flow channels. To analyze the time variation of area-average water thickness, it was confirmed that the lowering of the cell performance was caused by liquid plug formation.