The variation of Faradaic current efficiency as a function of electrolysis time is shown in Fig. 7. The current efficiencies increased sharply during the early electrolysis Geneticin (0–2 h) and then dropped rapidly for all three types of utilized cathode when the electrolysis time increased beyond 2 h. This might be due to the accumulation of some product species or/and residual contaminants (ex. metal salts or MONG) on the electrode surface, resulting in a decreased amount of free surface sites available for reacting with glycerol molecules. This behavior has also been observed in the electrochemical treatment of wastewater in the presence of calcium or magnesium salts  and .
Fig. 7. Variation in current efficiency at an initial pH 1 and 0.14 A/m2 current density with a (◊) Pt grid, (?) Ti/RuO2, or (○) SS cathode.Figure optionsDownload full-size imageDownload as PowerPoint slide
Fig. 8. Product distribution during the electrochemical conversion of glycerol (initial pH 1) at 0.14 A/m2 current density with a (a) Pt grid, (b) Ti/RuO2, or (c) SS cathode.Figure optionsDownload full-size imageDownload as PowerPoint slide