Continuing my experiments with aluminum, NaOH and water for hydrogen production.
Observation: Tin foil works fine, one gets a rather volatile reaction, a lot of initial steam mixed with hydrogen, then pure hydrogen. However, it isn't long lasting and the foil is quickly used up, and the show's over.
Using thicker aluminum (such as from a soda or beer can) has presented a problem, using the same solution. It will break down but the process is very slow. I've watched people online use Gallium to form an aluminum-gallium alloy on thicker aluminum to remove aluminum's natural oxide layer. This works a treat from what I've seen, but eh...Gallium is sort of expensive. It's recoverable from the process but one must still go and buy it. It's a rare metal too, so not everyone could depend on it.
Fortunately, I was informed of another way to remove the oxide layer of aluminum so it will react with water. Heat. Used an open flame just a few moments on sections of a beer can I cut up, including the tab. To prevent the oxide layer from forming again I dumped what I had just heated into cold water. Yes, WATER....COLD WATER. The water prevents the newly de-oxided aluminum from reforming it's oxide layer. This should never be done with hot or warm water though, as a reaction is likely, if not initially, then over time. In general, other ways to prevent oxidation should be used to store it, such as cooling it quickly (like with cold water) then immersing it into oil. This also will prevent oxidation.
So did it work? Oh yes, it did. Using only a small amount of tin can plus the tab, I added it to NaOH solution. Production. Not only that, unlike foil...sustained production. It literally went for hours! I kept the reaction vessel open by an open window (hydrogen is safe if dispersed in small amounts into the atmosphere, it eventually combines with something else). To my surprise, when I woke this morning it was still going, and now the vessel was cool, but still producing hydrogen. Basically once the process started with the NaOH producing some heat, it cooled down eventually but the process wasn't going to be undone until the metal broken down.
In related news, my other reaction vessel, to which I connected a bung with a hole through it to the lid and sealed it with a compound (prevent gas escaping) and run a small plastic hose through the bung and into a bubbler....well...I found out today I have disturbed the seal on the bung/lid connection. That's sort of dangerous, because I would never know that hydrogen was leaking out somehow unless I tried to run the hose through a bubbler and got little to no bubbles. Welp...that's what happened. So I sprayed water around the bung, and sure enough, a ton of bubbles formed, indicating the seal has been compromised.