Selective Ultrathin Carbon Sheath on Porous Silicon Nanowires: Materials for Extremely High Energy Density Planar Micro-Supercapacitors
Nano Letters2014Vol. 14(4), pp. 1843–1847
Citations Over TimeTop 10% of 2014 papers
John P. Alper, Shuang Wang, Francesca Rossi, G. Salviati, Nicholas Yiu, Carlo Carraro, Roya Maboudian
Abstract
Microsupercapacitors are attractive energy storage devices for integration with autonomous microsensor networks due to their high-power capabilities and robust cycle lifetimes. Here, we demonstrate porous silicon nanowires synthesized via a lithography compatible low-temperature wet etch and encapsulated in an ultrathin graphitic carbon sheath, as electrochemical double layer capacitor electrodes. Specific capacitance values reaching 325 mF cm(-2) are achieved, representing the highest specific ECDL capacitance for planar microsupercapacitor electrode materials to date.
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