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Capacitive hysteresis at the 1-ethyl-3-methylimidazolium tris(pentafluoroethyl)-trifluorophosphate–polycrystalline gold interface

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Abstract

We report potential-dependent capacitance curves over a 2-V potential range for the 1-ethyl-3-methylimidazolium tris(pentafluoroethyl)-trifluorophosphate (Emim FAP)–polycrystalline gold interface, and examine the effect of potential scan direction on results. We find very small levels of capacitive hysteresis in the Emim FAP–polycrystalline Au electrochemical system, where capacitance curves show minor dependence on the potential scan direction employed. This is a considerably different response than that reported for the Emim FAP–Au(111) interface where significant hysteresis is observed based on the potential scan direction (Drüschler et al. in J Phys Chem C 115 (14):6802–6808, 2011). Hysteresis effects have previously been suggested to be a general feature of an ionic liquid (IL) at electrified interfaces due to slow interfacial processes and has been demonstrated for numerous electrochemical systems. We provide new evidence that the experimental procedure used to acquire capacitance data and data workup could also have implications on capacitance–potential relationships in ILs. This work serves to progress our understanding of the nature of capacitive hysteresis at the IL–electrode interface.

Subtle changes in experimental methods can lead to significantly different capacitance measurements in ionic liquids. Which is the best approach?

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Acknowledgements

A.J.L. gratefully acknowledges support from the University of Iowa, Department of Chemistry GAANN Fellowship. A.J.L. kindly thanks Dr. Tamás Pajkossy (Hungarian Academy of Sciences), Prof. Bernard Boukamp (University of Twente), Jens Wallauer (rhd Instruments), and Prof. Mark Orazem (University of Florida) for helpful discussions.

Funding

This work was financially supported by the ACS-PRF and Iowa Energy Center under awards 55279-DNI5 and OG-15-002, respectively.

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  1. Department of Chemistry, University of Iowa, Iowa City, IA, 52242, USA

    Anthony J. Lucio & Scott K. Shaw

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Published in the topical collection Ionic Liquids as Tunable Materials in (Bio)Analytical Chemistry with guest editors Jared L. Anderson and Kevin D. Clark.

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Lucio, A.J., Shaw, S.K. Capacitive hysteresis at the 1-ethyl-3-methylimidazolium tris(pentafluoroethyl)-trifluorophosphate–polycrystalline gold interface. Anal Bioanal Chem 410, 4575–4586 (2018). https://doi.org/10.1007/s00216-018-0962-5

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