Graphene-Based Supercapacitors

Everyone plugs in their phone before sleeping without really thinking about it. The charger is a fixed coordinate of the day – a nightstand object, a travel item, a source of low-grade anxiety on long flights. Nobody questions the two hours because the two hours have always been there. There is no physical law that…

A driver pulls into a highway rest stop, connects a cable, and does not walk anywhere. Four minutes and forty seconds later, the cable disconnects. The car has 75 kilowatt-hours stored. The charging column is cool to the touch – not warm, cool – because the physics that makes this possible generates almost no heat…