A group of South Korean researchers has transformed used cigarette buds into a high-performing energy storing material which could be integrated into computers, handheld devices, electrical vehicles and wind turbines.
Interestingly enough, the new material significantly outperformed commercially available carbon, graphene and carbon nanotubes. When you consider the 5.6 trillion used-cigarettes, or 766,571 metric tons that are deposited into the environment worldwide every year, the advantages of such a material become even more evident. Basically, you take a pollution problem and turn it into an advantage.
Co-author of the study Professor Jongheop Yi, from Seoul National University, said:
“Our study has shown that used-cigarette filters can be transformed into a high-performing carbon-based material using a simple one step process, which simultaneously offers a green solution to meeting the energy demands of society. Numerous countries are developing strict regulations to avoid the trillions of toxic and non-biodegradable used-cigarette filters that are disposed of into the environment each year — our method is just one way of achieving this.”
Carbon is the most used element in supercapacitors, due to its relatively low cost, high surface area, high electrical conductivity and long term stability. Now, scientists are focused on improving the capacities of carbon supercapacitors, while also reducing production costs. In this study, they have shown that cellulose acetate fibres (the main component in cigarette filters) could be transformed into a carbon-based material using pyrolysis – a simple burning technique. Following the burning process, the resulting material has with many tiny pores which increase performance as a supercapacitive material.
“A high-performing supercapacitor material should have a large surface area, which can be achieved by incorporating a large number of small pores into the material,” continued Professor Yi. A combination of different pore sizes ensures that the material has high power densities, which is an essential property in a supercapacitor for the fast charging and discharging.”
After composing their theory and creating the material, they set out to test iti n a three-electrode system to see how well it stores energy. The results were remarkable – the material stored a higher amount of electrical energy than commercially available carbon and even had a higher amount of storage compared to graphene and carbon nanotubes, as reported in previous studies. So not only did it outperform commercially available products, it also outperformed other prototypes with much fancier materials.
Scientific Reference: Minzae Lee, Gil-Pyo Kim, Hyeon Don Song, Soomin Park, Jongheop Yi. Preparation of energy storage material derived from a used cigarette filter for a supercapacitor electrode. Nanotechnology, 2014; 25 (34): 345601 DOI: 10.1088/0957-4484/25/34/345601
