Transcript 下載/瀏覽
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