I have started with all together, water, sodium carbonate and glucose. The current was all the time at 4mA. At the start, the voltage between the electrodes was 16.2V and it raised constantly until, 30 min later it was somewhere around 19.5V. The both electrodes were almost clear and very easy to clean. I dont have an explanation.
On the other hand, when I started only with the distilled water and the sodium carbonate as electrolyte, at the same current, the starting voltage was the same16.2V but during the electrolysis, it’s dropped until 9.8V. When I have added the glucose, the conductivity dramatically decreased and color changed to amber. The only conclusion for me is that the glucose reduces the silver ions but in the same time, somehow “caps” the sodium carbonate also and stops him to act as electrolyte. The amber color means almost no conductivity at all.