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4hv.org :: Forums :: General Science and Electronics
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Making a supercapacitor...

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Inducktion
Sun Oct 23 2011, 02:11AM Print
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
I know this is probably tons easier said than done, but is it possible to make a supercapacitor out of activated carbon + insulators?

Link2

Going off of what it says here, that's basically the construction behind one.

Any thoughts?
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Weston
Sun Oct 23 2011, 05:06AM
Weston Registered Member #1316 Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
People have made them before. However, the max voltage is rather low. There was a discussion about this on 4hv a while ago: Link2
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Patrick
Sun Oct 23 2011, 05:29AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
In 1997 my sophmore year in HS, i made a 100 plus farad cap, pretty easy, with common electrolytes or acids you end up with 0.6 to 0.9 volts per cell, kinda low, the sulfuric acid i used (10 molar) was better that the potassium hydroxide, if i remember right.

keeping things liquid tight, while still conductive was always a problem though...
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Dr. Slack
Sun Oct 23 2011, 07:03AM
Dr. Slack Registered Member #72 Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Inducktion wrote ...

... that's basically the construction behind one.


The trouble with "basically the construction" is that there's usually a huge amount of technology (ie knowledge and experience, as well as cool machine tools and exotic chmeicals) between the basic idea and something that's saleable. I bet what you could cook up in your home lab is probably about as good as the first demo that some researcher in industry cooked up. The thing is, you will compare your effort against the commercial thing that has had 2 orders of magnitude improvement with subtle changes in composition, improvements in cleanliness, secret materials, reductions in spacings etc that have taken 20 years of experiment to produce, and probably be disappointed.
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Conundrum
Sun Oct 23 2011, 06:47PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
using Shapelock aka Polymorph to seal it might help here.

Possibly chemically dissolve it i.e. acetone then run it through a bubbler and allow the acetone to evaporate to obtain a fine powder.
Then mix this with your activated charcoal and other incredients to form the active plates.

Apparently another method is to take the prepared plate and electrolyse it in a dilute solution of sulphuric acid.
This forces the acid deeper into the plate and increases the effective capacitance...

Using PVDF as the salt bridge also helps from what I can find out.

Kind regards, -A
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