2019
DOI: 10.1002/open.201900211
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Potential Screening at Electrode/Ionic Liquid Interfaces from In Situ X‐ray Photoelectron Spectroscopy

Abstract: The Cover Feature displays a new method to investigate the potential screening at charged electrodes immersed in ionic liquids (ILs) by in situ X‐ray photoelectron spectroscopy. Using binding energy shifts under voltage bias with different ILs combined with Pt and Au electrodes, asymmetric potential screening effects could be attributed to specific attractive ion‐metal interactions and ion size effects. Our approach allows for unraveling interfacial properties of electrodes and ILs under clean ultra‐high vacuu… Show more

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Cited by 8 publications
(11 citation statements)
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“…Fig. 2a shows the PS results of neat [C 8 C 1 Im][Tf 2 N], neat [C 8 C 1 Im]Cl, and their mixtures on Au electrodes (note that the data of the neat ILs are reproduced from our previous study 45 ). Neat [C 8 C 1 Im][Tf 2 N] ( x = 1, red circles) shows within the applied cell voltage range a symmetric behavior, that is, the data for Δ φ cathodic closely follow the dashed line, which is a slope of 0.5.…”
Section: Resultsmentioning
confidence: 78%
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“…Fig. 2a shows the PS results of neat [C 8 C 1 Im][Tf 2 N], neat [C 8 C 1 Im]Cl, and their mixtures on Au electrodes (note that the data of the neat ILs are reproduced from our previous study 45 ). Neat [C 8 C 1 Im][Tf 2 N] ( x = 1, red circles) shows within the applied cell voltage range a symmetric behavior, that is, the data for Δ φ cathodic closely follow the dashed line, which is a slope of 0.5.…”
Section: Resultsmentioning
confidence: 78%
“…In our previous study, we have assigned this asymmetry for [C 8 C 1 Im]Cl mainly to the different sizes of the anion and cation. 45 Upon charging the anode more positively by increasing the applied voltage, the additional smaller Cl − counterions in the EDL reside within a smaller distance d at the anode compared to the situation at the cathode, where the larger [C 8 C 1 Im] + counterions compensate the increasing negative charge. Hence, considering the identical contact area A of both electrodes and assuming an identical DC permittivity ε , the corresponding capacitance ( C = ε 0 εA / d ) of the EDL at the anode ( C anodic ) is larger than that of the EDL at the cathode ( C cathodic ).…”
Section: Resultsmentioning
confidence: 99%
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