Figure 2

SEM micrographs for both (a) pristine S–Fe and (b) S–Ti; (c) and (d) correspond to after 100 cycles for (c) S–Fe and (d) S–Ti respectively.
SEM micrographs for both (a) pristine S–Fe and (b) S–Ti; (c) and (d) correspond to after 100 cycles for (c) S–Fe and (d) S–Ti respectively.