Electrochemical Performance of Supercapacitor with Stacked Copper Foils Coated with Graphene Nanoplatelets

Abstract

The energy density of conventional supercapacitors is in the range of 6–10 Wh kg−1, which has restricted them from many applications that require devices with long durations. Herein, we report a method for enhancing the energy density of a device through the parallel stacking of five copper foils coated on each side with graphene nanoplatelets. Microporous papers immersed in 2 M aqueous sodium sulphate were used as separators. With a low contact resistance of 0.05 Ω, the supercapacitor yielded an optimum specific energy density and a specific power density of 24.64 Wh kg−1 and 402 W kg−1 at 0.8 V, respectively. The working potential was increased to 2.4 V when three of the supercapacitors were connected in series, forming a tandem device. Its potential for real applications was manifested by the ability to light up a light-emitting diode for 40 s after charging for 60 s.

Rapid Production of Mn3O4/rGO as an Efficient Electrode Material for Supercapacitor by Flame Plasma

“…Supercapacitors have attracted much attention owing to their robust lifetimes, rapid charging capabilities and high power energy storage for mobile phone, hybrid electrical vehicles, back-up power systems, cranes, and lift [ 1 , 2 , 3 , 4 , 5 ]. A promising supercapacitor stores much more energy compared with electrostatic and electrolytic capacitors and exhibits stronger power with longer cycle life than the available battery [ 6 , 7 ].…”

Flexible and Mechanically Durable Asymmetric Supercapacitor Based on NiCo‐Layered Double Hydroxide and Nitrogen‐Doped Graphene Using a Simple Fabrication Method

“…Each curve displays a quite small semicircle in the high‐frequency region and a straight line in the low‐frequency region. The first intercepting point of the semicircle on the real axis at the high‐frequency end indicates the ESR, which comprises the ionic resistance of the electrolyte, the intrinsic resistance of the active materials, and the contact resistance between the active materials and the current collector . The ESR value after the deposition of NG decreased from 2.04 to 1.71 Ω, revealing enhancement in the electrical conductivity of NG/CC compared with CC.…”

Electrochemical properties of TiOx/rGO composite as an electrode for supercapacitors

“…The area under CV curve indicates the amount of electroactive species contained in the electrode. 9 Hence, TiO x A contained less electroactive species than TiO x B and rGO. In other words, rutile phase-dominated TiO x exhibited a better electro-active species activity than Magnéli TiO x .…”

“…1,4,5 Graphene, a class of two-dimensional carbon nanostructure, attracts more attention to be applied as the SC electrode, recently, due to its large specic surface area (2630 m 2 g À1 ), excellent electrical conductivity ($2000 S cm À1 ) and fast electronic mobility ($2 Â 10 5 cm 2 V À1 s À1 ). 1,[6][7][8][9] Reduction of graphene oxide is one promising approach to produce graphene in a large scale. 10 As the number of oxygen species in the reduced graphene oxide (rGO) is insignicant, it is reported to have excellent electron conductivity and a large specic surface area.…”