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Hydrogen storage methods.

Andreas Züttel1

  • 1Physics Department, University of Fribourg, Pérolles, 1700 Fribourg, Switzerland. Andreas.Zuettel@unifr.ch

Die Naturwissenschaften
|April 16, 2004
PubMed
Summary

Hydrogen is an efficient, clean fuel but faces storage challenges due to its low critical temperature. This review explores six hydrogen storage methods, including high-pressure gas, liquid hydrogen, and metal hydrides, highlighting their limitations and potential.

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Area of Science:

  • Energy Storage
  • Materials Science
  • Chemical Engineering

Background:

  • Hydrogen offers high energy density per mass and is environmentally friendly.
  • Current energy consumption relies heavily on fossil fuels, creating an economic dilemma for hydrogen production.
  • Hydrogen's low critical temperature (33 K) poses significant storage challenges.

Purpose of the Study:

  • To review various hydrogen storage methods.
  • To analyze the potential for improvement in hydrogen storage technologies.
  • To identify the physical limitations of different hydrogen storage approaches.

Main Methods:

  • High-pressure gas cylinders (up to 800 bar).
  • Liquid hydrogen in cryogenic tanks (21 K).
  • Adsorption, absorption in metal hydrides, and chemical bonding.
  • Indirect storage via reactive metals and water.

Main Results:

  • High-pressure gas cylinders can achieve volumetric densities of 36 kg/m³.
  • Liquid hydrogen offers a volumetric density of 70.8 kg/m³ but requires cryogenic temperatures.
  • Metal hydrides exhibit the highest volumetric hydrogen densities.
  • Reactive metals offer a recyclable storage method using water.

Conclusions:

  • Hydrogen storage remains a critical bottleneck for its widespread adoption as a fuel.
  • Each storage method presents unique advantages and limitations regarding density, temperature, and pressure.
  • Further research into advanced materials and storage systems is crucial for unlocking hydrogen's potential.

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