Extracting Hydrogen from Water

http://cr4.globalspec.com/search/sitesearch?do=show&sort=textmatchrank&srch=hho&order=asc

Sigh.

A graphite electrode that was chromed would have a layer of chrome and not copper. Now the copper may have been layered onto your graphite rod with a hot dipping process, but copper melts at 1083°. Carbon auto-ignites at 800°C. Hot dipping will therefore require an inert atmosphere. Most likely your electrodes were electroplated with copper. So by using copper plated electrodes you are just reversing the process used to put the copper onto the electrode. Now if you do a careful review of the well known process of the electrolysis of water you should find that graphite electrodes are used in the water cell to limit any secondary redox reactions.

yes sir you are right it was electroplated with copper, ok sir thanks to your informative suggestion.

Why would you use titanium? You need to review reduction-oxidation reactions. titanium is reactive and fairly unstable as a metal in the natural environment, much like magnesium, and will readily oxidize. The use of Carbon, Platinum, gold has to do with the reduction-oxidation potential and the reactivity of the metal. It has nothing to do with lightness to strength ratio.

Titinium is available at the moment, platinum is very rare to find. I opend a catalytic converter hoping that it has a pure platinum inside but when I check the material it is impossible to connect it in a circuit, some says inconel is a good substitute as electrodes, question is that can it be use as positive electrode or better to use it in both electrode?

Use Inconel welding rod

I've noticed in my experiment that the negative electrode is intact whereas the positive electrode deteriorate gradually, is it possible to use the negative electrode and use Inconel as my positive electrode? Or should I use inconel in both electrode?

Try it vary the elctrodes and keep notes, That why its caled Experimenting

Yes, congratulations!

You have rediscovered the fundamentals of electroplating. This process moves ionized metals through a solution from the positive electrode to the negative electrode. If you use the alloy of inconel for both electrodes you will just be the metals that make inconel from one electrode onto another. This will be difficult to notice at first because inconel plated on inconel will look like inconel. So until enough material has transferred from the positive electrode to be visibly diminished (pitted) the increase in mass of the negative electrode cannot be easily noticed. If instead you use another metal with a different color for the positive electrode (copper) then when a one or two atom thick layer of other colored metal plates onto the negative electrode a visible change will occur.