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You may want to discuss the effect of depassivating the surface of the aluminum immediately before putting the battery together. Either by dipping it briefly in hydrochloric acid or sanding it with 1000 grit sandpaper. Both methods would increase the surface area of the aluminum on a microscopic level. I would expect that both the voltage and current would increase. Probably current more so than voltage. It might be fun to experiment with depassivating the aluminum to demonstrate one of the many things that affect battery performance. I really enjoy your videos.
@m.k.8158 the aluminum air battery uses KOH with activated charcoal and paper towel to make about 1.2-1.3V. Keeping fresh electrolyte going to it keeps it going until aluminum dissolves but if it dries out or loses potency it's toast.
Your video is more than interesting, Ludic. It is a most valuable and spot on demonstration of Electrical Engineering knowledge. May God bless you and elongate your presence for us, your students, for what you do. Aafareen!
This really was a good educational video. Btw.. i would love to see more of this battery related video. And how about using a joule thief and light a LED with just a single cell of this battery..
I'd like to have seen more on the full capabilities of the cell. How long can you charge it and still get reasonable performance? How quickly does it degrade as you cycle it again and again? Etc.
Using salt (NaCl) gasses chlorine gas out when charging. Ventilate well!! Best results with carbon(+) and aluminium(-) electrodes. Try limit the amps when using a lab power source and play with the voltage. Aluminium is eroded by NaCl.
How long would they last. when you do make another video about it. Maybe a step by step how to make one with regular household items to use in emergencies.
Though aluminum dissolves in salt to create power, repeatedly charging it seems to "form" the intercalation not of aluminum but of sodium? Is this essentially a sodium ion battery?
I made a series if batteries using 16mm magnesium rod inside of 19mm copper tube, it had high amperage, but the electrolyte got hot after a few minutes and the current was hard to control
Interesting. So when you recharge the battery the copper and aluminum are restored back to pure metals? But that can't be possible because electrodeposition of aluminium can only happen at 1000 degrees C. Does it mean that only coper electrode is restored and aluminium is unchanged?
What if instead of the electrolyte solution, we dip the electrodes into the sea.. will the battery still work or will the electrons have trouble travelling that long distance?
@@ludicscience how about using carbon/graphite paint put on a paper or thin plastic and rolled with aluminum foil? C paint has large surface area. thanks for your nice videos.
not quite:an electrolytic capacitor would not self-produce power, nor would it keep producing much power after discharging-however, there are similarities between batteries and electrolytic capacitors. If he used 2 aluminum electrodes and sodium bicarbonate(sold as baking soda), this would be a form of an electrolytic capacitor. Note:borax will work instead of baking soda. The resulting capacitor would have to be formed by passing a limited dc current through it so that one of the plates forms an oxide layer. It will then work as a electrolytic capacitor.
When I charged this battery my electrolyte water turned into green colour later like after 5 minutes turned completely black in colour and my power supply exploded and damaged.
