You may have seen this recently on BoingBoing. It’s a fairly fluff-filled video showing the “Super-supercapacitor”, and yeah, it’s pretty cool. There’s a lot of repeating “this is the best thing since toilet paper” stuff on this story as well as a bunch of other stories that basically repeat the same thing, but not much on how to make one or how the thing works.
Now, a little more searching will take you to this video with a little more detail on the process:
But here’s the Mother Lode: Here’s the page at Science that gives you the link for the pdf that shows all about how to do it. …and the direct link to the pdf. Here’s another source:El-Kady-SOM. There’s another download of the article, too. laser-scribing-of-high-performance-and-flexible-graphene-based-electrochemical-capacitors. Please respect the restrictions stated on the documents. The, well, post (the meat of the information is on the pdfs) on Science goes like this:
Laser Scribing of High-Performance and Flexible Graphene-Based Electrochemical Capacitors
Although electrochemical capacitors (ECs), also known as supercapacitors or ultracapacitors, charge and discharge faster than batteries, they are still limited by low energy densities and slow rate capabilities. We used a standard LightScribe DVD optical drive to do the direct laser reduction of graphite oxide films to graphene. The produced films are mechanically robust, show high electrical conductivity (1738 siemens per meter) and specific surface area (1520 square meters per gram), and can thus be used directly as EC electrodes without the need for binders or current collectors, as is the case for conventional ECs. Devices made with these electrodes exhibit ultrahigh energy density values in different electrolytes while maintaining the high power density and excellent cycle stability of ECs. Moreover, these ECs maintain excellent electrochemical attributes under high mechanical stress and thus hold promise for high-power, flexible electronics.
There’s not much news or information on the technology coming out yet, but some interesting internet babble about possible products on the market by 2014. I’d say, definitely not vaporware, considering the creds of Science, but maybe a bit of a way off? I dunno, but I’m dusting off my old Lightscribe…