The electrical power of the future just might be waiting in ashtrays across the world (gosh I hope not though). Researchers in South Korea discovered that, with a one-step conversion process, cigarette filters turn into great supercapacitors.
Supercapacitors are an electrical storage alternative to batteries. In batteries, energy is stored in chemical reactants, while in supercapacitors, it’s stored as an electrical field between materials. Batteries are slow to charge and heavy, but they’re also compact and store great amounts of energy, which means they’ve long held an advantage in consumer products. But supercapacitors work where space constraints matter less: Braking in a car generates a lot of electricity, and in some cars supercapacitors capture that energy and then release it to get the car going again. Unlike batteries, supercapacitors can release bursts of power more quickly, making them useful in electronics like defibrillators. Imagine static electricity from wearing wool socks on carpet – the charge builds up quickly and is then released all at once in a spark.
It turns out that the collections of fibers in cigarette filters have a lot to offer a supercapacitor. Here’s how the scientists described the process:
“Used cigarette filters are composed largely of cellulose acetate. They are disposable, non-biodegradable, toxic and are a threat to the environment after usage. However, it has been reported that cellulose acetate can be directly utilized in the production of carbon materials containing a meso-/micropore structure by only a carbonization process. That is, used cigarette filters could be used as a proper carbon source for supercapacitors. Importantly, carbonizing used cigarette filters in a nitrogen-containing atmosphere could provide the nitrogen doping on the carbon structure with the formation of such unique pore structures in a one-step process.”
That’s a mouthful, but in essence, the filters grow pores by being burned in a nitrogen rich environment which increased surface area. The process makes them able to store even more energy.