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Precise Pore Engineering at Picometer Scale on Nanofluidic Membrane for Efficient Hydrogen Purification.

Huijie Wang1, Chong Wang1, Jiang Liu2

  • 1State Key Laboratory of Microbial Technology, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.

Angewandte Chemie (International Ed. in English)
|October 25, 2025
PubMed
Summary

Researchers developed new Hydrogen-bonded framework (HBF) membranes for efficient hydrogen purification. These membranes precisely tune pore sizes for superior H2/CO2 separation, advancing clean energy technologies.

Keywords:
Gas separationH2 purificationNanofluidic hydrogen‐bonded framework (HBF)Picometer scalePore regulation

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Hydrogen is a key carbon-free energy carrier, but its production via methane steam reforming generates CO2, necessitating efficient purification.
  • Nanofluidic Hydrogen-bonded framework (HBF) membranes show promise for gas separation, yet precise pore tailoring for enhanced performance is limited.

Purpose of the Study:

  • To fabricate and evaluate a series of HBF membranes for efficient hydrogen purification.
  • To investigate the effect of anion linkers on pore size and gas separation performance.
  • To demonstrate a strategy for ultra-precise pore engineering in membranes.

Main Methods:

  • Fabrication of HBF membranes (SIFHBF-Cu, GeFHBF-Cu, TIFHBF-Cu) with precisely tuned picometer-scale pores (< 1 Å) by altering anion linkers (SiF6^2-, GeF6^2-, TiF6^2-).
  • Evaluation of membrane performance for H2 purification and ternary gas separation (H2/CO2, H2/CH4).
  • Assessment of membrane stability under dry and wet conditions.

Main Results:

  • The SIFHBF-Cu membrane achieved excellent H2/CO2 selectivity (501) and ternary gas separation (H2/CO2: 477, H2/CH4: 557).
  • Performance is attributed to optimal size-exclusion and enhanced CO2 affinity due to F-site interactions.
  • Stable performance was observed under both dry and wet conditions.

Conclusions:

  • A strategy for ultra-precise pore engineering in HBF membranes was successfully demonstrated.
  • The developed membranes show significant potential for efficient hydrogen purification and other challenging separation applications.
  • Tailoring anion linkers offers a pathway to fine-tune pore characteristics for advanced gas separation.