LIG samples and the pH was adjusted by 1M HCl or 1M NaOH solutions. ZIR compensation was applied for all samples. We observed a significant change in pH 1.95 and pH 3.07 indicating the effect of high acidity conditions on CV plots. As shown in this plot, the pH has a two-fold effect, shifting the peak potential into a slightly positive potential range with the increase of electrolyte acidity and affecting Fe(CN)6 4-/3-redox kinetics. For bare LIG electrodes (Fig. ), a non-faradaic current increase is observable for acidic pH, which may suggest gradual graphene decomposition by electrolyte . Among the studied polysaccharide HMs the dominant effect of pH on the CS coating (Fig. ) persists in a wide range of tested pH.