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Establishing ZIF-8 as a reference material for hydrogen cryoadsorption: An interlaboratory study.

Jose A Villajos1,2, Rafael Balderas-Xicohténcatl3,4, Ali N Al Shakhs5

  • 1Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|January 2, 2024
PubMed
Summary
This summary is machine-generated.

This study proposes ZIF-8 pellets as a reference material for hydrogen storage. Measurements across nine labs showed highly reproducible cryoadsorption data, highlighting ZIF-8

Keywords:
hydrogen storageinterlaboratory analysismetal-organic frameworksreference materialreproducibility and standardization

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Storage

Background:

  • Hydrogen storage via cryoadsorption offers advantages like safety and fast kinetics.
  • Lack of standardized reference materials leads to discrepancies in hydrogen uptake data for adsorbents.
  • Metal-organic frameworks (MOFs) like ZIF-8 show promise due to their stability.

Purpose of the Study:

  • To evaluate the suitability of ZIF-8 pellets as a reference material for hydrogen cryoadsorption.
  • To assess the reproducibility of hydrogen uptake measurements across different laboratories and experimental setups.
  • To identify sources of deviation in cryoadsorption measurements.

Main Methods:

  • ZIF-8 pellets were synthesized and distributed to nine laboratories.
  • Hydrogen (H2) uptake was measured using gravimetric and volumetric analyzers at 77 K and up to 100 bar.
  • The influence of operational variables such as sample amount and temperature was investigated.

Main Results:

  • Gravimetric hydrogen uptake measurements at 77 K and 10-100 bar showed high reproducibility with a relative standard deviation of 3-4%.
  • Device calibration and correction procedures were identified as significant sources of measurement deviation.
  • ZIF-8 pellets demonstrated robustness and stability across various experimental conditions.

Conclusions:

  • ZIF-8 pellets exhibit excellent reproducibility for hydrogen cryoadsorption measurements.
  • The developed ZIF-8 pellets are proposed as a reliable reference material for the field.
  • Standardization of measurement protocols is crucial for accurate hydrogen storage data.