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High Surface Proton Conduction in Nanostructured ZIF-8.

Daniel Muñoz-Gil1, Filipe M L Figueiredo2

  • 1Department of Materials Engineering and Ceramics, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal. danielmg@ua.pt.

Nanomaterials (Basel, Switzerland)
|September 27, 2019
PubMed
Summary

Nanostructuring zeolitic imidazolate framework-8 (ZIF-8) enhances protonic conductivity. This water-mediated surface transport mechanism in ZIF-8 materials boosts conductivity by reducing particle size.

Keywords:
ZIF-8nanostructureprotonic conductivitysurface

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Zeolitic imidazolate framework-8 (ZIF-8) possesses high microporosity and excellent stability.
  • Protonic conductivity in ZIF-8 is typically limited.
  • Understanding transport mechanisms is crucial for optimizing ZIF-8 applications.

Purpose of the Study:

  • To investigate the protonic conductivity of ZIF-8 as a function of particle size.
  • To elucidate the water-mediated surface transport mechanism in ZIF-8.
  • To demonstrate a general strategy for enhancing conductivity in metal-organic frameworks.

Main Methods:

  • Synthesis of ZIF-8 powders with varying particle sizes (80 nm to 2.8 µm).
  • Dynamic water vapor sorption analysis to study water adsorption.
  • X-ray photoelectron spectroscopy (XPS) to identify surface species (di-coordinated Zn ions).
  • Impedance spectroscopy to measure protonic conductivity under varying humidity and temperature.

Main Results:

  • Water adsorption shifts from micropore-dominated in microcrystals to external surface-dominated in nanocrystals.
  • Nanocrystalline ZIF-8 exhibits protonic conductivity two orders of magnitude higher than microcrystalline ZIF-8.
  • Protonic conductivity reached approximately 0.5 mS·cm⁻¹ at 94 °C and 98% relative humidity.
  • Di-coordinated Zn ions on the surface are linked to the water-mediated proton transport.

Conclusions:

  • Particle nanostructuring of ZIF-8 significantly enhances protonic conductivity via surface transport.
  • This approach leverages surface defects and water mediation, avoiding chemical functionalization.
  • The strategy is applicable to other metal-organic frameworks for improved conductivity under harsh conditions.