In this work, nano-sized nickel particles were dispersed on multi-walled carbon nanotubes using
multi-step impregnation method, to use them as hydrogen storage media. The dispersion degree of
nickel particles on multi-walled carbon nanotubes is inversely proportional to the nickel
concentration of solution. It was observed that the low nickel concentration is efficient to decorate
nickel particles into the inner space. Multi-step impregnation method of MWNTs through several
times with low nickel concentration is more efficient to manufacture Ni-MWNTs having well
dispersed metallic nickel particles.
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