The electrochemical properties of Au(111) in four different batches of the same IL (see Table ) were studied by cyclic voltammetry. For each measurement, the first CV is shown in Figure , where the starting potential was always set to 0.5 V, scanning to negative potentials first, with a scan rate of 5 mV s -1 . The lower and upper potential limits (LPL and UPL) were set to -1.5 V and 1.7 V. All potentials in this work are referenced versus the Zn/Zn[TFSI] 2 redox-couple. Consecutive potential cycles lead to subtle changes in some of the peaks of the CVs, as illustrated in Figure , showing the first and fifth potential cycles. The key peaks described below can be resolved in all potential cycles. In addition, the cathodic current density decreases with increasing number of potential cycles.