Raising the performance of a 4 V supercapacitor based on an EMIBF4–single walled carbon nanotube nanofluid electrolyte

Abstract

Addition of a single walled carbon nanotube in ionic liquids of EMIBF4 produced a nanofluid with increased ionic conductivity. It, as the electrolyte, allowed the increase of the capacitance, energy density and cycling stability of a supercapacitor operated at 4 V.

Engineering the Electrochemical Capacitive Properties of Graphene Sheets in Ionic‐Liquid Electrolytes by Correct Selection of Anions

“…For IL electrolytes, EW is the voltage range between the reduction (cathodic limit) and oxidation potentials (anodic limit). [48,49] In addition, as seen from the inset in Figure 11 a, GSs in these IL electrolytes can almost reach their corresponding maximum work voltages at a current density of 1 A g À1 , because of the high electrical conductivity of GSs. Figure 11 4 ] (which reaches 4.0 V).…”

Enhancing 5 V capacitor performance by adding single walled carbon nanotubes into an ionic liquid electrolyte

“…2a and b). 23 Note that, 5 V SCs using the thick electrode of double walled and multiwalled CNTs exhibit an energy density (>100 W h kg À1 ), which is far larger than that (35 W h kg À1 ) at 4 V and comparable to the best results of 4 V SCs using an electrode of graphene and SWNTs. S3a †).…”

“…[2][3][4][5][6][7][8][9][10][11][12][13][14] In detail, energy density of novel carbon electrodes such as carbon nanotubes (CNTs) or graphene can be increased from 50-60 W h kg À1 (in an organic electrolyte) at 3 V to 90-110 W h kg À1 (in an ionic liquid (IL) electrolyte) at 4 V. [3][4][5][6][7][8][9] Theoretically, elevating the voltage window of SCs to 5 V will further increase the energy density. [18][19][20][21][22] Recently, nano-uids have been applied to 4 V IL SCs, which allowed the increase of the performance of SCs operated at 4 V. 23 However, there is no report on a nanouid being used in 5 V SCs, in which the electrochemical environment is more complex and tougher. [15][16][17] These features are unfavorable for the transport of ions and electrons from the bulk phase of the electrolyte to the electrode/ electrolyte interface.…”

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.…”