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Solar-Driven Reversible Hydrogen Storage Over LiNH2-2LiH.

Zibo Cheng1,2, Yeqin Guan1,3, Le Xie1

  • 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.

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PubMed
Summary

This study shows that UV light can break down lithium amide-lithium hydride composites for hydrogen storage. This photo-induced method enables efficient hydrogen release under mild conditions, overcoming previous limitations.

Keywords:
hydrogen storagelithium amidelithium hydridephoto‐decompositionphoto‐thermal conversion

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Area of Science:

  • Materials Science
  • Chemistry
  • Energy Storage

Background:

  • Lithium amide-lithium hydride composite (LiNH2-2LiH) is a promising material for hydrogen storage due to its high capacity (10.29 wt.%).
  • Its practical application is limited by thermodynamic stability and slow reaction kinetics for N-H and Li-H bond cleavage and formation during hydrogen release and uptake.
  • Current methods rely on high temperatures, hindering efficient hydrogen storage.

Purpose of the Study:

  • To investigate the photo-induced destabilization of LiNH2-2LiH for efficient hydrogen storage.
  • To explore the mechanism of UV-induced N-H bond cleavage and hydrogen evolution.
  • To demonstrate the feasibility of hydrogen release and uptake under mild conditions using light.

Main Methods:

  • Photoexcitation of LiNH2 using UV illumination (0.8 W·cm-2) to induce N-H bond cleavage.
  • Coupling LiNH2 with LiH to suppress gaseous byproducts during UV-driven hydrogen release.
  • Utilizing high-intensity full-spectrum illumination (2.9 W·cm-2) to leverage combined non-thermal and photothermal effects.
  • Testing hydrogen release and uptake reversibility over multiple cycles.

Main Results:

  • UV illumination of LiNH2 induced homolytic N-H bond cleavage, leading to H2, N2, and NH3 evolution.
  • Coupling LiNH2 with LiH effectively suppressed gaseous byproducts during UV-driven hydrogen release.
  • Complete dehydrogenation (>10.0 wt.%) of LiNH2-2LiH was achieved under high-intensity illumination.
  • Near-full reversibility (ca. 99% capacity retention) was observed over 6 cycles.
  • Direct hydrogen release from LiNH2-2LiH was demonstrated under natural sunlight.

Conclusions:

  • Photo-induced destabilization is a viable strategy for activating strong bonds in amide-hydride composites.
  • This approach offers a promising pathway for solid-state hydrogen storage under mild conditions.
  • The developed method overcomes the kinetic and thermodynamic limitations of traditional thermal dehydrogenation.