The situation that the electrolysis current of A 𝑧 A (|𝑧 A | = 1) is much smaller in the absolute value that that of A 𝑧 A (|𝑧 A | = 3) in the absence of supporting electrolyte minimizes the electrophoretic effect of A 𝑧 A (|𝑧 A | = 1). This is the reason that CV of A + is very close to that of A - (Fig. ).