1. Explain the best methods of storing hydrogen. 11720026 Daisuke Ishikawa

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

3. 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.

4. Liquid hydrogen or Compressed hydrogen

5. 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

6. 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.

7. 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.

8. State of hydrogen storage system

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

10. Thank you for your attention Thank you for your attention