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Proton-Encapsulated Metal-Organic Frameworks for High-Performance Proton Exchange Membranes Operating Across Broad

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Zwitterionic sulfamic acid encapsulated in MOF-808 enhances proton exchange membrane fuel cell (PEMFC) performance. The hybrid membrane shows improved proton conductivity, especially in low-humidity conditions, boosting fuel cell adaptability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Proton exchange membrane fuel cells (PEMFCs) are crucial for clean energy, but their performance is limited by traditional Nafion membranes' sharp drop in proton conductivity at low humidity.
  • Expanding the operating humidity range is key to enhancing PEMFC environmental adaptability.

Purpose of the Study:

  • To develop a high-performance proton exchange membrane (PEM) with improved conductivity under low-humidity conditions.
  • To enhance the environmental adaptability and operational range of PEMFCs.

Main Methods:

  • Encapsulating zwitterionic sulfamic acid (SA) within a metal-organic framework MOF-808 (SA@MOF-808) to create a functional filler.
  • Incorporating the SA@MOF-808 filler into a Nafion matrix to form a hybrid membrane.
  • Evaluating the water retention capacity and proton transport properties of the hybrid membrane.

Main Results:

  • The SA@MOF-808 filler exhibits excellent water retention due to hydrophilic groups and high porosity.
  • The zwitterionic sulfamic acid forms an efficient proton transport channel via hydrogen bonding.
  • The hybrid membrane shows significantly enhanced proton conductivity: 1.1x at 95% RH and 1.6x at 40% RH (80°C) compared to Nafion.
  • Maximum conductivity reached 299.60 mS·cm-1.

Conclusions:

  • The developed hybrid membrane offers a superior strategy for designing high-performance PEMs suitable for low-humidity environments.
  • This approach effectively addresses the limitations of traditional membranes, paving the way for more robust PEMFC applications.