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Supercapacitor electrodes fabricated from single‐walled carbon nanotubes (SWNTs) are shown to be capable of durable operation at 4 V, exceeding the operating voltage limit of activated carbon electrodes (AC, 3 V), while delivering significantly higher energy and power (see figure). Dual exploitation of SWNTs as combined electrodes and current collectors is also explored.
An approach is presented to make a “surface‐only solid” with a surface area of 2 240 m2 g−1 (1 310 m2 cm−3), corresponding to 85% of the atoms constituting a surface, by opening single‐walled carbon nanotube forests and solids via controlled oxidation. The controllability of the approach is demonstrated by tailoring the hole size to match the guest molecule, for example, nitrogen, fullerene, or solvated...
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