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Enhancing Volumetric Hydrogen Storage Capacity through Bimodal Packing of MOF Particles.

Wan-Tae Kim1, Dae Won Kim2, Dong Yun Shin3

  • 1Extreme Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, South Korea.

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Bimodal particle packing in metal-organic frameworks (MOFs) significantly boosts hydrogen storage. This strategy reduces void space, enhancing volumetric capacity for practical applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Packing density is crucial for metal-organic framework (MOF) hydrogen storage capacity but often ignored in volumetric evaluations.
  • Interparticle voids in MOFs limit practical hydrogen uptake, impacting system-level performance.

Purpose of the Study:

  • To investigate bimodal particle packing as a strategy to enhance volumetric hydrogen storage in MOFs.
  • To optimize MOF particle size distribution for maximum packing density and hydrogen uptake.

Main Methods:

  • Synthesis of V3(PET) MOF in two sizes (∼9 μm and ∼300 nm) for bimodal packing.
  • Discrete Element Method (DEM) simulations to determine optimal particle mixing and packing rules.
  • Experimental validation using tapping density measurements and high-pressure H2 adsorption isotherms.

Main Results:

  • Bimodal packing achieved a packing fraction of 0.56, significantly higher than unimodal packing (0.42).
  • Volumetric excess hydrogen uptake increased by 33-38% at 77 K with bimodal packing.
  • Enhanced working capacity of 37.7 g/L under pressure-temperature swing adsorption (PTSA) conditions.

Conclusions:

  • Bimodal particle packing effectively reduces interparticle voids, enhancing system-level volumetric hydrogen storage in MOFs.
  • Particle-level packing engineering is a viable strategy to improve MOF-based hydrogen storage performance.
  • This approach bridges intrinsic MOF properties with practical, system-level storage requirements.