What's the best electrolyte for water electrolysis?
I'm electrolyzing H2O to produce H2 + O, but I'm not sure what the ideal electrolyte would be. NaCl works, but I am somewhat concerned about the Cl coming off the cathode. How would I find out what quantity of Cl would likely be produced? I am experimenting with the intention of building a hydrogen torch, so process will be happening on a relatively large scale.
Also, I'd like to find out how to determine what factor is limiting the hydrogen production -- is it the conductivity of the solution, the surface area of the electrodes, voltage applied, or the chemical relations between the electrolyte and the electrodes?
If anyone can answer these questions or direct me to suitable resources online that would be great.