When testing their newly designed green electrode, say the researchers, they found that their supercapacitor had very stable electrochemical properties. In particular, the specific capacitance - or the ability of the device to store an electrical charge - changed little, even after thousands of cycles of charging and discharging.
Also, for an optimal lignin-manganese dioxide ratio, the specific capacitance was observed to be up to 900 times more than what has been reported for other supercapacitors. These supercapacitors are also very light and flexible, say the researchers - properties that extend their use as structural energy storage elements in vehicles, for example.
"In this study, we have been able to make a plant-based supercapacitor with excellent electrochemical performance using a low-cost, sustainable method," says Liang. "In the near future, we’d like to make our supercapacitors 100% environmentally friendly by incorporating only green, sustainable ingredients."
Due to the superior electrochemical performance, say the researchers, the supercapacitor shows exceptional potential for future sustainable and green electronics. For more, see " Design and synthesis of high performance flexible and green supercapacitors made of manganese-dioxide-decorated alkali lignin ."
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