Immersion measurements of potential of zero total charge (pztc) of Au(100) in an ionic liquid

In order to determine the potential of zero total charge (pztc) we measured charging current transients upon immersing Au(100) into an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate (BMIPF6). In the current–time transients two sections could be identified, one attributed to double-layer charging, the other to spurious Faradaic or adsorption processes. The pztc, as determined from the short-time section, was found to be 0.4 V vs. Ag/AgCl.