Figure 2. N-methyl viologen CV at different scan rates (50, 100, 300 mV/s) on Pt electrodes. The arrow shows the direction of scan rate increase. The bold curve shows the CV measured at 50 mV/s but only between -0.5 V and -1.0 V

From

Electrochromism of Methylviologen (Paraquat)

N. Aristov, A. Habekost

World Journal of Chemical Education. 2015, 3(4), 82-86 doi:10.12691/wjce-3-4-1