Carbon "onions" make for rapid-discharge capacitor

By John Timmer.

We tend to focus on charge storage in terms of the batteries that power our electronic devices and, increasingly, our cars. But charge storage devices now make an appearance on scales ranging from tiny implanted medical devices to on-grid electrical storage. No single technology performs well across that range of applications, so scientists have continued to experiment with different kinds of batteries and capacitors. A paper that was released by Nature Nanotechnology describes a new kind of capacitor, built from onion-like shells of graphene, that may give us another option for specific needs: discharge rates of up to 200V per second, "three orders of magnitude higher than conventional supercapacitors." … Read More>>

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