UCell - UCL Fuel Cells

Hydrogen Storage

Anna's research involves studying methods of hydrogen storage. Storage is a vital factor in the commercialisation of fuel cells as a safe, efficient and energy dense way of storing hydrogen will greatly improve the viability of fuel cell technology, particularly for automotive applications. Hydrogen can be stored in any state; as a solid, a liquid or a gas.

State Storage Mechanism and supply mechanism Advantages Disadvantages
Gas  Pressurised carbon fibre composite gas tank up to 700 bar  Commercially available 

Energy required for compression

Energy from fossil fuels usually used to produce hydrogen

Tanks are bulky and must be cylindrical

Safety concerns

Costly tanks

Liquid  Cryogenic tank at -253°C

Commercially available

Excellent gravimetric and volumetric hydrogen capacity at low pressures 

30-40% energy loss to cool to cryogenic temperatures

1%/day losses from boil off

Safety concerns

Costly tanks

Solid  Chemical hydrides heated to <100°C to decompose and release hydrogen

Excellent gravimetric and volumetric hydrogen capacity

Safe, easy to handle

In the early development stages

Energy required for off-board regeneration

Harmful by-products must be removed from the impure hydrogen gas stream  


More information about hydrogen storage can be found in this document from the International Energy Agency.

Page last modified on 25 mar 14 14:17


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