Amazing graphene super capacitor!

[Magluvin]

I see it was already posted . Hackaday

Mags

[Pirate88179]

I see it was already posted . Hackaday

Mags

Yes, I posted that as I check their site all of the time.  They have some great things on there, most of which i do not understand.  It is a good place to learn some new developments though, except, they are not as advanced as we are here on OU on the JT circuits, but other than that....

Bill

[gravityblock]

This patent discloses how to create a graphene or graphene oxide arerogel which may be reinforced with a polymer.  The polymer could be a polycarbonate layer on a dvd disc to act as a dielectric for the formation of a high stability graphene aerogel super capacitor.  Exposing the surface area of 1 gram of this graphene aerogel would cover the length of an entire football field.  This method allows the graphene super capacitor to easily be scaled up.  Below is a snippet of the patent above.  Interesting stuff!

A carbon-based aerogel is disclosed in which the carbon atoms are arranged in a sheet-like nanostructure. The aerogel may be either a graphene oxide aerogel or a graphene aerogel and may further be reinforced with a polymer. A method for making the aerogel is also disclosed and includes providing graphite oxide, creating a dispersion of the graphite oxide in a liquid, and drying the dispersion to form a graphene oxide aerogel. In one embodiment, the graphene oxide aerogel is thermally treated to convert the graphene oxide to graphene.

[gravityblock]

I believe that was in response to my question above about the tape method.  i asked how it worked and thought maybe the efficiency could be scaled up a bit.  In thinking about it, I think perhaps the tape removes from the surface some particles that have been oxidized by the exposure to air.  If this is correct, why could we not grind the graphite into powder form and place it in a vessel and pressurize the vessel with pure oxygen and maybe even agitate the contents a bit?  It would seem to me that this would speed up the oxidation process...perhaps not by enough to make it viable.  The method used in those videos was with acid, which would be problematic for me to do in my small apartment.  Maybe we can come up with something that does indeed work.

Bill

Bill,

Here's a video on "how to make Graphene at home by the bucket-load:  Part 2 - Simplified method".  This simplified method looks relatively safe if the necessary precautions are taken with there being no risk for explosion.  Let me know what you think, thumbs up or thumbs down?

Thanks,

Gravock

Video Description:

Published on Feb 1, 2013

"So, i was getting a lot of people telling me that the method I was using was pretty complicated and I agree. So, I have spent quite a bit of time looking for a much simpler way to do this and I think I have found it. Basically the method is to put

320ml Sulphuric Acid
80ml Phosphoric Acid
3.2g graphite Flake
18g Potassium Permanganate

into a jar and leave it sitting around for 3-4 days. At the end of that time add 100ml of Hydrogen Peroxide and you are done. What you should have is a bright yellow precipitate of graphene oxide. Then you need to wash this in 1 moar HCl and water until the pH is about 4 or 5. I don't think you could get simpler than this for a wet chemical method that seems to produce nearly 100% graphene oxide - well, I know I don't lead that interesting a life but I am pretty excited by this."

Edit: Corrected bad link.

[Pirate88179]

Bill,

Here's a video on "how to make Graphene at home by the bucket-load:  Part 2 - Simplified method".  This simplified method looks relatively safe if the necessary precautions are taken with there being no risk for explosion.  Let me know what you think, thumbs up or thumbs down?

Thanks,

Gravock

Video Description:

Published on Feb 1, 2013

"So, i was getting a lot of people telling me that the method I was using was pretty complicated and I agree. So, I have spent quite a bit of time looking for a much simpler way to do this and I think I have found it. Basically the method is to put

320ml Sulphuric Acid
80ml Phosphoric Acid
3.2g graphite Flake
18g Potassium Permanganate

into a jar and leave it sitting around for 3-4 days. At the end of that time add 100ml of Hydrogen Peroxide and you are done. What you should have is a bright yellow precipitate of graphene oxide. Then you need to wash this in 1 moar HCl and water until the pH is about 4 or 5. I don't think you could get simpler than this for a wet chemical method that seems to produce nearly 100% graphene oxide - well, I know I don't lead that interesting a life but I am pretty excited by this."

Thanks for posting this but, when I hit the video link, it opens another page and takes me to the OU home page for some reason.  I have heard of this happening to some folks here but I have no idea why.  This method does sound reasonably safe and simple even though I was a very poor chemistry student, I think I could do this ok.

Can any one else get the video link ok or is it just me this time?

Thanks, great research on all of this.

Bill