In confirmation of the superviscosity hypothesis and in agreement with kinetic estimates , the EC-AFM measurements demonstrated a drastic, 10 5 -10 8 times, increase of the near-electrode viscosity η S of solutions (electrolyte NaF, the specifically non-adsorbed ions, the sample was a polished gold electrode). The influence of electrode potential was accurately measured (Fig. ); the displacement of the electrode potential vs. the potential of zero charge E pzc = -0.05 V SCE, is accompanied by a regular growth of the η S -values, as well as by a significant expansion of the viscous near-electrode zone. In accordance with the EDL theory, increasing the electrolyte concentration leads to its narrowing (ca. 6 nm and 4 nm, 0.001 M and 0.1 M NaF) and the growth of η S .