Single-wall carbon nanotubes (SWNTs) were examined as catalysts for
improving the hydrogen absorption and desorption properties of Ti/Zr-doped
NaAlH4
hydride, proposed as a reversible hydrogen storage material. We studied the hydrogen
charge and discharge characteristics and stability of sodium aluminium composites ball
milled with carbon additives such as SWNTs, graphite or activated carbon (AX-21). The
SWNT–NaAlH4 system
was tested at 160 °C
for up to 200 cycles, and the sorption kinetics were enhanced by a factor of four. Also, the catalyzed
NaAlH4
hydride with graphite and activated carbon additives shows fast absorption and desorption
kinetics. Our results indicate that by creating new hydrogen transition sites, the structure
of carbon in the composites plays an important role in enhancing the hydrogen absorption
and release rates.
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