I promise not to be a lurking pest, so I will impart a few more caveats before moving back into the shadows.
I'm sure you all know that the current increase is not a linear function, it increases in steps, you will add voltage and see very little difference and then bam! up a few or 10's of mA. I must say that when you do not see gas being evolved that you are working closer to strickly ohmic conduction versus ionic. Also you will not be able to stop gas once you exceed as Robin stated ~ 1.2V. Although some in the field have evolved gas below this level with the proper supply (pulsed DC). The Teflon pan may not be the best of containers to try your test in, I might suggest a liter beaker or some HDPE container. What I have observed is that a passive metal container is part of the circuit, if connected or not. Over the years many a SS container has suffered microscopic pin holes when being used in this way. I'll keep watching and if I think I have anything of value I'll drop a line. Good Luck..
