Electrochemical performance of a superporous activated carbon in ionic liquid-based electrolytes

Leyva-García, S.; Lozano‐Castelló, Dolores; Morallón, Emilia; Vogl, Thomas; Schütter, Christoph; Passerini, Stefano; Balducci, Andrea; Cazorla‐Amorós, Diego

doi:10.1016/j.jpowsour.2016.11.010

Cited by 33 publications

(31 citation statements)

References 48 publications

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“…For example, Shen and Hu used carbon black in the positive electrode and activated carbon in the negative electrode and obtained a device operating at 3.0 V using conventional electrolyte (1 mol L −1 TEABF 4 in PC), however, the lower surface area of carbon black compared to activated carbon decreases the overall device specific capacitance. Moreover, Balducci and collaborators have employed different organic solvents or ILs as conductive salts in organic solvent to increase the electrolyte stability. A maximum operating voltage of 3.5 V was obtained when 1 mol L −1 of [Pyr 1,4 ][Tf 2 N] in PC or TEABF 4 in 3‐cyanopropionic acid methyl ester were used .…”

Section: Physicochemical Properties Of Pc‐based Electrolyte [Pyr14]mentioning

confidence: 99%

“…Moreover, Balducci and collaborators have employed different organic solvents or ILs as conductive salts in organic solvent to increase the electrolyte stability. A maximum operating voltage of 3.5 V was obtained when 1 mol L −1 of [Pyr 1,4 ][Tf 2 N] in PC or TEABF 4 in 3‐cyanopropionic acid methyl ester were used . The [B(CN) 4 ] ILs still show greater maximum operating voltage than these alternatives.…”

Section: Physicochemical Properties Of Pc‐based Electrolyte [Pyr14]mentioning

confidence: 99%

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Improved Performance of Ionic Liquid Supercapacitors by using Tetracyanoborate Anions

et al. 2018

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Supercapacitors are energy storage devices designed to operate at higher power densities than conventional batteries, but their energy density is still too low for many applications. Efforts are made to design new electrolytes with wider electrochemical windows than aqueous or conventional organic electrolytes in order to increase energy density. Ionic liquids (ILs) with wide electrochemical stability windows are excellent candidates to be employed as supercapacitor electrolytes. ILs containing tetracyanoborate anions [B(CN)4] offer wider electrochemical stability than conventional electrolytes and maintain a high ionic conductivity (6.9 mS cm−1). Herein, we report the use of ILs containing the [B(CN)4] anion for such an application. They presented a high maximum operating voltage of 3.7 V, and two‐electrode devices demonstrate high specific capacitances even when operating at relatively high rates (ca. 20 F g−1 @ 15 A g−1). This supercapacitor stored more energy and operated at a higher power at all rates studied when compared with cells using a commonly studied ILs.

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Section: Physicochemical Properties Of Pc‐based Electrolyte [Pyr14]mentioning

confidence: 99%

Section: Physicochemical Properties Of Pc‐based Electrolyte [Pyr14]mentioning

confidence: 99%

Improved Performance of Ionic Liquid Supercapacitors by using Tetracyanoborate Anions

et al. 2018

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“…The energy density of EDLCs is calculated by E=1/2CV 2 , in which C is the capacitance of EDLCs and V is the cell voltage. Thus, the energy stored in EDLCs increases as the square of V. Compared with the electrochemical window of aqueous electrolytes of~1 V [11][12][13][14] or organic electrolytes of~2.7 V [15], ILs exhibit wider electrochemical window, which can be up to 5 V [16]. 4 shows wider cell voltage (~3.5 V) with higher energy density [17].…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid electrolytes in electric double layer capacitors

et al. 2019

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Electric double layer capacitors (EDLCs), which store free charges on the electrode surface via non-Faradaic process, balanced by the electric double layer on the electrolyte side, exhibit excellent cycle stability and high power density. Though EDLCs are considered as promising energy storage devices, the charges stored on the electrode surface in EDLCs are much lower than those in batteries. Ionic liquids (ILs), as a new type of electrolytes in EDLCs, are capable to deliver high energy density, due to their excellent physicochemical properties and wide electrochemical window. In this review, we focus on the widely studied IL electrolytes for EDLCs, including pure ILs, IL/IL binary electrolytes, IL/organic solvent mixtures, as well as functionalized ILs, with attention on the relationship between the structures of different IL-based electrolytes and the energy storage properties in EDLCs. For imidazolium-and ammonium-based IL electrolytes which are most widely studied in EDLCs, the former generally have higher gravimetric specific capacitance, while the latter exhibit wider electrochemical window. The modifications of functional group substituted can be an effective strategy to enhance the gravimetric specific capacitance of the latter and thus improve the energy density of EDLCs.

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“…In the last decades, ionic liquids have been used as electrolytes of electrochemical devices showing quite promising results due to their good ionic conductivity, wide electrochemical window, and high thermal stability [11][12][13][14][15][16] . In particular, the tetrafluoroborate of 3-triethylammonium-propane sulfonic acid ionic liquid (TEA-PS.BF 4 ) was successfully applied in water electrolysis 1,[17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

Effect of different carbon supports for Ni particles for the HER in tetra‐alkylammonium‐sulfonic acid media

et al. 2019

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Summary Vitreous carbon (VC) and pyrolytic carbon (PC) were covered by nickel particles through sputter deposition, consisting in the Ni/VC and Ni/PC electrodes, respectively. These materials were tested as cathodes in an aqueous solution of tetrafluoroborate of the 3‐triethylammonium‐propane sulfonic acid ionic liquid (TEA‐PS.BF4) for hydrogen production and characterized by scanning electron microscopy (SEM), chronoamperometry (CA), linear and cyclic voltammetry (LV and CV), and electrochemical impedance spectroscopy (EIS). The mechanism of the hydrogen evolution reaction (HER) was that of Volmer‐Heyrovsky for all the cathodes tested, and the H2 desorption at the catalytic surface is the determining step. The results indicate that different carbon supports can affect the efficiency of the particulate electrocatalyst deposited on it. The low values of H+ adsorption and the H2 desorption resistances of the modified PC system (0.43 and 0.8 Ω cm2, respectively), in relation to the modified VC system (1.13 and 7.9 Ω cm2, respectively), attest that Ni particles presence on PC favored the adsorption of H+ and H2 nanobubble desorption. The Ni particles on PC increase exchange current density (80.5 μA cm2 for Ni/PC cathode about 38.3 Ω cm2 for Ni/VC cathode) and enhance catalytic activity. These results can be attributed to the faster liberation of the active sites due to the interaction between the Ni particles and the PC support. In addition, the TEA‐PS.BF4 solution can act as a stripper, avoiding the formation of passive oxides in the open circuit and preventing the deactivation of the electrocatalyst.

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Electrochemical performance of a superporous activated carbon in ionic liquid-based electrolytes

Cited by 33 publications

References 48 publications

Improved Performance of Ionic Liquid Supercapacitors by using Tetracyanoborate Anions

Improved Performance of Ionic Liquid Supercapacitors by using Tetracyanoborate Anions

Ionic liquid electrolytes in electric double layer capacitors

Effect of different carbon supports for Ni particles for the HER in tetra‐alkylammonium‐sulfonic acid media

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