Figure 6

Polarization curves for st-37 in 0.5 M H2SO4 (a) based on bulk, and (b) nano size of Dracocephalum, and in 1.0 M HCl (c) based on bulk, and (d) nano size of Dracocephalum, at 25 ± 1 °C.

Polarization curves for st-37 in 0.5 M H2SO4 (a) based on bulk, and (b) nano size of Dracocephalum, and in 1.0 M HCl (c) based on bulk, and (d) nano size of Dracocephalum, at 25 ± 1 °C.