Abstract
Single-wall carbon nanotubes (SWNTs) were examined as catalysts forimproving the hydrogen absorption and desorption properties of Ti/Zr-dopedNaAlH4 hydride, proposed as a reversible hydrogen storage material. We studied the hydrogencharge and discharge characteristics and stability of sodium aluminium composites ballmilled with carbon additives such as SWNTs, graphite or activated carbon (AX-21). TheSWNT–NaAlH4 systemwas tested at 160 °C for up to 200 cycles, and the sorption kinetics were enhanced by a factor of four. Also, the catalyzedNaAlH4 hydride with graphite and activated carbon additives shows fast absorption and desorptionkinetics. Our results indicate that by creating new hydrogen transition sites, the structureof carbon in the composites plays an important role in enhancing the hydrogen absorptionand release rates.
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