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Ferrocene-based metal-organic frameworks (MOFs) show enhanced stability and proton conductivity. These materials offer a promising pathway for advanced proton conduction applications due to their stability and ease of synthesis.

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Area of Science:

  • Materials Science
  • Chemistry

Background:

  • Crystalline metal-organic frameworks (MOFs) are of interest for proton conduction.
  • Low stability and proton conductivity (σ) limit current MOF applications.
  • Ferrocene-containing MOFs offer improved structural stability and unique properties.

Purpose of the Study:

  • To synthesize and characterize novel three-dimensional ferrocene-based MOFs.
  • To investigate the impact of ferrocene groups on MOF stability and proton conductivity.
  • To explore the proton transport mechanisms in these advanced materials.

Main Methods:

  • Preparation of three-dimensional ferrocene-based MOFs (MIL-53-FcDC-Al/Ga and CAU-43).
  • Characterization using powder X-ray diffraction (PXRD), infrared (IR), and scanning electron microscopy (SEM).
  • Proton conductivity measurements via AC impedance at various temperatures and relative humidity (RH).

Main Results:

  • Ferrocene incorporation enhanced thermal, water, and acid-base stability.
  • Achieved proton conductivities up to 5.20 × 10⁻³ S/cm at 100 °C/98% RH.
  • MIL-53-FcDC-Al/Ga exhibited ultrahigh σ (>10⁻⁴ S·cm⁻¹) at 30 °C/98% RH.

Conclusions:

  • Ferrocene-based MOFs demonstrate superior stability and proton conductivity.
  • These materials are easily assembled, inexpensive, non-toxic, and stable.
  • The findings suggest significant potential for practical proton conduction applications.