Scorched hair makes supercapacitors greener. Researchers in China have used human hair to make a vital component of energy-storage devices. The discovery could lead to more efficient and environmentally-friendly replacements for traditional batteries. Waste human hair can be turned into carbon flakes that suitable for use in supercapacitor electrodes Many batteries currently in use, such as the lead–acid batteries in cars, are heavy and bulky and rely on hazardous chemicals to store electrical charge. With increasing worldwide sales of mobile electronics, the environmental impact of batteries is receiving more attention and motivating research into supercapacitors, which can be made from sustainable carbon-based materials. Unfortunately, these carbon materials are usually either difficult to manufacture or derived from fossil fuels.
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