2019
DOI: 10.1021/acsnano.8b09768
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Graphene Meets Ionic Liquids: Fermi Level Engineering via Electrostatic Forces

Abstract: Graphene-based two-dimensional (2D) materials are promising candidates for a number of different energy applications. A particularly interesting one is in next generation supercapacitors where graphene is being explored as an electrode material in combination with room temperature ionic liquids (ILs) as electrolytes. Since the amount of energy that can be stored in such supercapacitors critically depends on the electrode-electrolyte interface, there is considerable interest in understanding the structure and p… Show more

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Cited by 30 publications
(32 citation statements)
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“…[5] From pzc to negative potentials, the electron doping in SLG results in a change of the sign of the slope in the Mott-Schottky analysis. [9c, 25] In this potential range, n-doping of SLG might be favored by the strong interaction of EMIm + and SLG, such as reported by Velpula et al [14] In addition, the evolution of C int À2 respective to the potential seems sensitive to the electrolyte. As shown in Figure 2 and Table S2, the evolution of the slope of C int À2 ÀE curves evidence that the addition of ACN impacts the charge carrier density at the SLG/ionic liquid interface.…”
Section: Resultsmentioning
confidence: 91%
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“…[5] From pzc to negative potentials, the electron doping in SLG results in a change of the sign of the slope in the Mott-Schottky analysis. [9c, 25] In this potential range, n-doping of SLG might be favored by the strong interaction of EMIm + and SLG, such as reported by Velpula et al [14] In addition, the evolution of C int À2 respective to the potential seems sensitive to the electrolyte. As shown in Figure 2 and Table S2, the evolution of the slope of C int À2 ÀE curves evidence that the addition of ACN impacts the charge carrier density at the SLG/ionic liquid interface.…”
Section: Resultsmentioning
confidence: 91%
“…As shown in Figure 2 and Table S2, the evolution of the slope of C int À2 ÀE curves evidence that the addition of ACN impacts the charge carrier density at the SLG/ionic liquid interface. [14] Based on the slope and Equation (2), the charge carrier density (N D ) was calculated in the level of 10 23 cm À3 for the SLG electrode immersed in neat ionic liquid, from both pzc to positive and negative polarizations. Considering a Debye length of about 1 nm in neat ionic liquid, [13] this translates into a charge carrier density N D % 10 14 cm À2 , that is similar to the charge doping density previously reported for SLG electrode (10 12 -10 14 cm À2 ).…”
Section: Resultsmentioning
confidence: 99%
“…[9c, 25] In this potential range,n -doping of SLG might be favored by the strong interaction of EMIm + and SLG,such as reported by Velpula et al [14] In addition, the evolution of C int À2 respective to the potential seems sensitive to the electrolyte.A ss hown in Figure 2a nd Table S2, the evolution of the slope of C int À2 ÀE curves evidence that the addition of ACNimpacts the charge carrier density at the SLG/ionic liquid interface. [14] Based on the slope and Equation (2), the charge carrier density (N D ) was calculated in the level of 10 23 cm À3 for the SLG electrode immersed in neat ionic liquid, from both pzc to positive and negative polarizations.C onsidering aD ebye length of about 1nminneat ionic liquid, [13] this translates into acharge carrier density N D % 10 14 cm À2 ,t hat is similar to the charge doping density previously reported for SLG electrode (10 12 -10 14 cm À2 ). [26] Forp ositive potentials,t he slopes with (À17.7 F À2 m 4 V À1 )o rw ithout (À25.9 F À2 m 4 V À1 )s olvent indicate as lightly higher N D in solvated electrolyte but essentially very similar N D level.…”
Section: Resultsmentioning
confidence: 97%
“…It was shown, for instance,t hat the adsorption of alkyl imidazolium cations causes n-type doping of graphene and the magnitude of doping increases with cation alkyl chain length. [14] Thei nterfacial capacitance,e specially in concentrated electrolytes,i sv ery sensitive not only to the electronic structure of the electrode,b ut also to the nature of the electrolytes at the polarized interface. [13,15] Unfortunately,the experimental approaches aiming at understanding the correlation between the nature of the electrolytes and the charge of EDL at SLG electrode are relatively scarce.I no ur previous work, SLG was transferred onto an Au quartz and used as at wo-dimensional platform to study the ion fluxes at the interface between SLG and neat ionic liquid electrolyte, [11] using EQCM and electrochemical impedance spectroscopy (EIS).…”
Section: Introductionmentioning
confidence: 99%
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