Carbon Nanotube–Nanocup Hybrid Structures for High Power Supercapacitor Applications

Abstract

Here, we design and develop high-power electric double-layer capacitors (EDLCs) using carbon-based three dimensional (3-D) hybrid nanostructured electrodes. 3-D hybrid nanostructured electrodes consisting of vertically aligned carbon nanotubes (CNTs) on highly porous carbon nanocups (CNCs) were synthesized by a combination of anodization and chemical vapor deposition techniques. A 3-D electrode-based supercapacitor showed enhanced areal capacitance by accommodating more charges in a given footprint area than that of a conventional CNC-based device.

Hierarchical Nanocomposites of Polyaniline Nanowire Arrays on Reduced Graphene Oxide Sheets for Supercapacitors

“…According to the charge storage mechanism, supercapacitors can be classified into two categories: electric double layer capacitors and pseudocapacitors1. The former is usually made of carbon-based materials234, and the capacitance generates from charge separation at the electrode/electrolyte interface. The latter is mainly made of transitional metal oxide56 or conductive polymer78, and the capacitance generates from fast faradic reaction.…”

From Nanotechnology to Nanoengineering

“…In addition, their wide range of power capability makes it possible to hybridize them with other energy-storage devices, such as batteries and fuel cells. The performance of supercapacitors have been further improved by using nanostructures (Frackowiak et al 2006;Cheng et al 2011;Kong et al 2013;Hahm et al 2012;Kim et al 2012). It is worth mentioning here that carbon nanostructures compared to the other types of nanostructures have been preferred to be used in the electrode materials.…”

Three-Dimensional Porous Architectures of Carbon Nanotubes and Graphene Sheets for Energy Applications

“…In addition, they permit high loading of electrochemically active nanomaterials to gain high electrochemical pseudocapacitance. The 3D carbon nanocup-CNT structures have been synthesized on anodized aluminum oxide for EDLC based supercapacitors (Hahm et al, 2012). The CNT modification gives carbon nanocup an extremely high-specific surface area (1340 m 2 g −1 ) and enhances its capacitance to 45 F g −1 in 1 M LiPF 6 .…”