I see this all the time. A major issue seems to be that the science is simply beyond many people. Either because they have not bothered to familiarise themselves with Faraday's laws of electrolysis, have not researched the subject fully or simply fail to understand what the laws imply - it basically just goes straight over their heads...
So, it never fails to amaze me how so many people interested in - and indeed actively pursuing - this science, fail miserably to grasp Faraday's laws. How can people make head-or-tail of the results from electrolyser experiments without fully understanding Faraday's laws? The mind boggles!
See now, this is an immediate problem. This is impossible. Not just because I think so, or Michael Faraday says so, but because it really is not possible.Here are a few bullit points for nce from the creators
almost double gas production at the same current relative to koh
Any given current can only evolve a given amount of gas. Gas evolved is directly proportional to the current - this is irrelevant of the electrolyte employed. You know that the NCE plays no actual part in the final chemical reaction because you yourself state that it does not get used up, and rightly so. So the electrolyte itself cannot be evolving gas.
Anyone with a full grasp of Faraday's laws of electrolysis would see the problem immediately, but for those people who are confused, this is quite simply why it is not possible:
At the cathode, the hydrogen ion (a single proton) needs to pick up an electron to become a hydrogen atom before it can evolve as gas. Every hydrogen ion must collect an electron from the cathode to become an atom. The more current flowing through a cell, the more hydrogen ions there will be to collect electrons from the cathode. This is why the gas production is directly proportional to the current flowing.
1 hydrogen ion + 1 electron = 1 hydrogen atom
This is why it is impossible to achieve double the gas production in any given electrolyser for the same current. If people really can't see this then perhaps they should think about applying themselves to something they do understand.
What can happen, and something else that is rarely, if ever, considered is that along with the evolving oxygen and hydrogen you will get water vapour. So you will be collecting three gases, not just two. This will certainly make a difference to the volume of gas collected and measured, moreso with electrolysers that run hot.