During the electrolysis of water in the presence of KCl as electrolyte when I collect current and voltage data by oscilloscope, the current value decreases from 3A (at 100 ppm KCl concentration) to around 0.8A (at 1000 ppm KCl concentration). Voltage decreases from 2.3 kV (at 100ppm KCl) to 2kV at 250ppm KCl, but remains same at 2 at 500 & 1000 ppm KCl.
i wonder if something is wrong with my measurements ? or it can be justified ? I am from a chemistry background so its very hard for me to sort it out.
In general, if gas bubbles (from the electrolysis products) stick on the electrodes, the apparent solution resistance can dramatically increase with time.
The experimental conditions for water electrolysis seem to be very harsh... kilovolt voltages and amperes of current? Are the units correct?
applied voltage was 80 V only at all conditions ,,, the resultant voltage which i have mentioned are those measured by oscilloscope at different conc (at same time duration in all cases i.e., 5 minutes)..
I think it is resulting from change in KCl concentration. also it can be justified that if there are no electrochemical process, which is not the case here, the ohm rule should be obeyed. i believe that you can find your answer in related I-E curves of water splitting in presence of KCl as electrolyte. I'm not shore but the chloride ion plays an important role in high voltages.
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