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The energy density of the flexible nanotube supercapacitors compares well with existing supercapacitors, made using other technologies - even higher. The energy density is of about 70kW/kg, higher than that of commercial devices. The prototype, though, doesn't have enough capacity to do anything useful, but the researchers are now studying methods to increase the energy density, so that one day supercapacitors could replace old lithium-based batteries for good, and spare important environmental resources now ruined by mining for lithium.

Printable electronics have taken off in recent years, and there are now industrial-scale printing machines that can efficiently deposit a variety of flexible electronic components onto flexible substrates to create wearable sensors, displays, smart packaging labels, and other printable products. However, developing printable, flexible energy-storage devices, such as supercapacitors and batteries has lagged behind.