Transient-CV simulations were carried out in the solution without supporting electrolyte. The smaller the absolute value of the reactant valence, the greater the migration effect. The simulations suggest that in the one-electron reduction reaction of reactant at 𝑧 A = +1 without supporting electrolyte, the migration potential Δ𝜙 is sufficient to counteract the driving force potential 𝐸 -𝐸°r ds