2011
DOI: 10.1021/jp200395j
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On Capacitive Processes at the Interface between 1-Ethyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate and Au(111)

Abstract: Electrochemical impedance spectroscopy was used for characterizing the interface between the ultrapure room-temperature ionic liquid, 1-ethyl-3-methylimidazolium tris(pentafluoroethyl)-trifluorophosphate, [EMIm]FAP, and a Au(111) working electrode (WE). Plots of the potentialdependent spectroscopic data in the complex capacitance plane (CCP) reveal the existence of three distinct processes taking place on different time scales. At all WE potentials ranging from -0.5 to þ1.0 V versus a Pt pseudo-reference elect… Show more

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Cited by 92 publications
(149 citation statements)
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References 58 publications
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“…The same index n indicates that the respective cathodic and anodic current density peaks are based on the same redox process. A discussion of the origin of these current density peaks is beyond the scope of the present [25,26,30].…”
Section: Resultsmentioning
confidence: 91%
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“…The same index n indicates that the respective cathodic and anodic current density peaks are based on the same redox process. A discussion of the origin of these current density peaks is beyond the scope of the present [25,26,30].…”
Section: Resultsmentioning
confidence: 91%
“…Thus, it is important to carry out studies on the interface between well-defined electrodes and very pure ionic liquids and to establish suitable methods for the extraction of capacitance data from broadband EIS spectra. Potential-dependent differential capacitance data were extracted from broadband impedance spectra in the following way [25,26]: (i) conversion of complex impedance data into complex capacitance data; (ii) fit of the complex capacitance data with an empirical Cole-Cole equation. The obtained capacitance curves are critically compared with theoretical predictions of mean-field models [17,19,20].…”
Section: Introductionmentioning
confidence: 99%
“…For the present system, Au(100) | BMITf 2 N, both circuits were applicable. Alternatively, the equivalent circuit of Figure 2.a was found to be appropriate for Au(100) | BMIPF 6 and Au(100) | BMITf 2 N; the circuit of Figure 2.b was definitely inappropriate for Au(100)|BMIPF 6 , but appropriate for Au(100)|BMITf 2 N, Au(111)|BMIPF 6 [16], Au(100)|guanidinium-based ILs [20], and also for the Au(111)| [EMI][FAP] 4 system [38]. The connection of the models and systems, just as the physical meaning of the W-and/or CPE-elements still remains an open issue.…”
Section: Discussionmentioning
confidence: 99%
“…71 While Mo simulations, [72][73][74] modified MSA theory, 75 and DF have revealed that the DC can have both negative a temperature dependence for the restricted primitiv negative temperature dependence is expected for t and temperature of our simulations. that the use of single-frequency measurements could lead to misleading results [98][99][100] . Although some of the experimental problems do not arise in computer simulations, where, for example, it is much easier to study a perfect monocrystalline surface than a polycrystalline one, they also have their drawbacks.…”
Section: B Capacitancementioning
confidence: 99%