Carbon nanofiber supercapacitors with large areal capacitances

McDonough, James R.; Jang Wook Choi; Yuan Yang; La Mantia, Fabio; Yuegang Zhang; Yi Cui
December 2009
Applied Physics Letters;12/14/2009, Vol. 95 Issue 24, p243109
Academic Journal
We develop supercapacitor (SC) devices with large per-area capacitances by utilizing three-dimensional (3D) porous substrates. Carbon nanofibers (CNFs) functioning as active SC electrodes are grown on 3D nickel foam. The 3D porous substrates facilitate a mass loading of active electrodes and per-area capacitance as large as 60 mg/cm2 and 1.2 F/cm2, respectively. We optimize SC performance by developing an annealing-free CNF growth process that minimizes undesirable nickel carbide formation. Superior per-area capacitances described here suggest that 3D porous substrates are useful in various energy storage devices in which per-area performance is critical.


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