Welcome! Let’s grow the hydrogen economy together. Let’s grow the hydrogen community! Questions & Answers Is humidifying hydrogen necessary for all fuel cell stack?

  • Is humidifying hydrogen necessary for all fuel cell stack?

    Posted by rahul Das on December 18, 2023 at 11:15

    Humidification is typically carried out to ensure the membrane remains wet, facilitating the movement of protons from the anode to the cathode. Water vapor produced at the cathode contributes to membrane wetness. Additionally, humid air is sent to support this process.

    GOPALA VINJAMURI replied 3 months, 3 weeks ago 3 Members · 2 Replies
  • 2 Replies
  • Roger Penn

    Member
    January 4, 2024 at 16:17

    No, external humidification is not required for all fuel cell stacks. Normally, it is the cathode (air side) that is externally humidifier. The anode, hydrogen side, has recirculation and normally doesn’t require an external humidifier.

    Humidification is always required, but can be done internally instead of externally by recycling product water inside the stack and fuel cell system.

    The Toyota Mirai fuel cell vehicle has no external humidification and does this with specially design fuel cell components and stack operating conditions that keep the membrane sufficiently hydrated so that no external humidifier is required. Each design case is unique and can be assessed for internal or external humidification.

    Air cooled fuel cell stacks with open cathodes will also be typically designed without external humidification (although there are exceptions). Simulations for water balance in the membrane, stack, and fuel cell system are usually performed to determine movement of water and definition of operating conditions that allow no external humidifier.

  • GOPALA VINJAMURI

    Member
    January 29, 2024 at 15:54

    Thank you for sharing your expertise. Will 5MW fuel cells can decentralize H2 power?

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