Old Cigarette Butts Could Be Used To Make Supercapacitors


In case you haven't been following the supercapacitor hype, they're devices that store energy in electrical charges rather than chemical reactions, as batteries do. That means supercapacitors can charge and discharge much faster than batteries. The reason you don't have a lightning fast supercapacitor in your laptop, though, is because they're huge. They've largely been relegated to industrial uses so far, like storing the energy from wind turbines, but scientists are always looking for new ways to make better supercapacitors.

One unexpected source for new supercapacitor material is used cigarette filters, which currently do little but litter our sidewalks and parks. In a study published in Nanotechnology, scientists in South Korea report how to treat filters to help make supercapacitors.

The material inside cigarette filters is a synthetic fiber called cellulose acetate that, when heated in the presence of nitrogen, turns into a carbon-based material full of pores. The pores contribute to its high surface area, making it good for supercapacitors. When the team tested it for how well it charged and discharged electrons, they found it worked better than commercially available materials—as well as graphene and carbon nanotubes, as reported in previous studies.

Maybe someday soon, the cigarette butts littering your street could be put to much better use. [Nanotechnology via Institute of Physics]

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