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Intermetallic Compounds for Hydrogen Storage: Current Status and Future Perspectives.

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Area of Science:

  • Materials Science
  • Chemistry
  • Engineering

Background:

  • Intermetallic compounds are explored for hydrogen activation and storage, crucial for low-temperature applications and metal hydride batteries.
  • Current intermetallic compounds do not meet the 5.5 wt.% gravimetric hydrogen storage capacity target.
  • Existing materials present trade-offs between storage capacity and operating temperature (e.g., Mg2Ni vs. ZrV2, LaNi5).

Purpose of the Study:

  • To provide a comprehensive review of intermetallic compounds for hydrogen storage.
  • To examine synthesis methods, metallurgical, and structural properties.
  • To analyze the relationship between structural parameters and hydrogen storage performance.

Main Methods:

  • Review of existing literature on intermetallic compounds and hydrogen storage.
  • Analysis of synthesis approaches including solidification-based and solid-state diffusion-based methods.
  • Examination of metallurgical and structural properties and their correlation with hydrogen storage.

Main Results:

  • Identified a non-linear correlation between void volume and gravimetric hydrogen storage capacity.
  • Highlighted critical parameters governing performance: lattice structure, its evolution upon hydrogen absorption, hydride formation enthalpy, and hydrogen activation reactivity.
  • Discussed limitations of current materials regarding capacity and operating conditions.

Conclusions:

  • Intermetallic compounds require further research to meet hydrogen storage demands.
  • Void volume, lattice structure, and thermodynamic properties are key targets for optimizing hydrogen storage materials.
  • Understanding structure-property relationships is essential for designing next-generation hydrogen storage solutions.