“…Fig. 2a shows the PS results of neat [C 8 C 1 Im][Tf 2 N], neat [C 8 C 1 Im]Cl, and their mixtures on Au electrodes (note that the data of the neat ILs are reproduced from our previous study 45 ). Neat [C 8 C 1 Im][Tf 2 N] ( x = 1, red circles) shows within the applied cell voltage range a symmetric behavior, that is, the data for Δ φ cathodic closely follow the dashed line, which is a slope of 0.5.…”