Technology Review: Print-on-Demand Power:
"The new capacitors are made by spraying carbon nanotubes onto two pieces of plastic, then sandwiching a gel electrolyte in between them. In the resulting device, one nanotube network acts as the positive electrode while the other functions as the negative electrode. When a voltage is applied to the electrolyte gel, charges collect on the surfaces of the nanotubes, storing energy. 'The performance of the device is comparable to other devices,' says Cui. 'The key is that everything is printable.'"
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