Explain the best methods of storing hydrogen Daisuke Ishikawa

Introduction Methods of storing hydrogen “Liquid hydrogen or Compressed hydrogen” “Chemical storage” Metal hydrides, Carbohydrates “Physical storage” Carbon nanotube, Cryo-compressed

Liquid hydrogen or Compressed hydrogen A method to liquefy like gasoline is ideal to store hydrogen most compactly. It is suitable for the mass transit. Advantages Disadvantage s Hydrogen has low liquefaction temperature with -253 degrees Celsius. It needs big energy to liquefy.

Liquid hydrogen or Compressed hydrogen

Chemical storage DenominationChemical composition Hydrogen storage capacity (wt.%) Characteristic Magnesium hydrideMgH 2 about 7stability Sodium aluminum hydrideNaAlH 4 until 5.5low cost Lithium amideLiNH 2 until 10.4Need high temperature and low pressure Lanthanum Nickel AlloyLaNi 5 about 1.4 Mischmetal Nickel AlloyMmNi 5 about 1.4

Chemical storage The hydrogen filling density is extremely higher than gas. It can prevent the outbreak of the accident by the sudden hydrogen leak. Advantages Disadvantage s These metals except Mg and V are very heavy. There are the heat with the reaction.

Physical storage Despite initial claims of greater than 50 wt% hydrogen storage, it has generally come to be accepted that less than 1 wt% is practical. Hydrogen carriers based on nanostructured carbon have been proposed. There is a capillary array same way of carbon nanotubes.

State of hydrogen storage system

Conclusion “Compressed hydrogen is mainstream now.” ‘More efficient’ Chemical storagePhysical storage Safety Low cost Light Big capacity

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