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Hydrogen Storage and Pressure Increasing
Ma31w203
吳俊儀
Hydrogen Storage Methods
 High
Pressure Tanks
 Liquid Hydrogen
 Carbon Nanotube Surface Absorbtion
 MgH2
 NaAlH4
Comparison of Methods
Method
% of Weight Hydrogen
Volume 1kg Hydrogen
Hydrogen Gas 200bar
100%
0.06𝑚3
Hydrogen Liquid
100%
0.014𝑚3
Carbon Nanotube
~6-8%
0.2𝑚3
MgH2
7.6%
0.009𝑚3
NaAlH4
7.5%(5.6%)
0.01𝑚3
Where and How Hydrogen be Stored

Hydrogen storage will be required onboard
vehicles and at hydrogen production sites,
hydrogen refueling stations, and stationary power
sites. Possible approaches to storing hydrogen
include:
 Physical
storage of compressed hydrogen gas in high pressure
tanks (up to 700 bar);
 Physical storage of cryogenic hydrogen (cooled to -253°C, at
pressures of 6-350 bar) in insulated tanks; and
 Storage in advanced materials — within the structure or on
the surface of certain materials, as well as in the form of
chemical compounds that undergo a chemical reaction to
release hydrogen.
Storage Background

Compressed hydrogen dangerous; low energy density

Liquefied hydrogen expensive; cooling and compressing
results in loss of 30% of stored energy

Metal hydrides deliver hydrogen safely at constant
pressure; sensitive to impurities; store only up to 7 % of
its weight

Liquid carrier storage uses fossil fuels as source of
hydrogen; defeats purpose of using alternative energy
Carbon Nanotubes
 Stable,
lightweight, inexpensive
 Large
active surface area
 Large
internal volume if it can be accessed
Carbon Nanotubes
 Stores
hydrogen in pores of microscopic
tubes and within tube structures
 Similar
storage mechanism as metal
hydrides
 Capable
of storing 4.2% to 65% of their
own weight in hydrogen
Carbon Nanotubes
Carbon Nanotubes
Hydrogen storage in nanotubes