Fig. 4 provides the
SEM images showing the change in surface morphology of the
5 vol. % CNTs/Al composite according to the hydrogen generation
rate of the hydrolysis reaction in 10 wt. % NaOH solutions.
Pores and pits rapidly formed in the 30 s e hydrolysis
process. As can be seen in Fig. 4b), pores with diameters of
about 3e5 mm, emerged at after the 3 min hydrolysis process.