Figure shows the evolution of the CV for Au(111) in the IL with a water content of 450 ppm (higher content than in the previous experiment), recorded after different times of storage of the IL in the glove box (from 12 h to five days). With Karl-Fischer titration we found that the water content was constant over the investigated period of time. First, by comparing the CVs measured here (having 450 ppm water) with those containing 270 ppm water (Figure ), we did not observe a significant increase of peak C1. On the contrary, the peak is smaller than in the measurement with 270 ppm water. This could already show a first effect of storage time since the measurement in Figure was recorded directly after adding the water to the IL. The most notable observation is that peak C1 decreases with increasing storage time, while peak C3 increases. After five days the CV looks almost identical to the CV recorded in the as-received IL with a water content of <75 ppm.