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Electrochemical reactivity and stability of platinum nanoparticles in imidazolium-based ionic liquids

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Abstract

The electrocatalytic activity of synthesized quasi-spherical Pt nanoparticles (NPs) has been studied, taking as a model the COads electrooxidation reaction in two imidazolium-based ionic liquids such as 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [C4mim+][NTf2 −] and 1-butyl-3-methylimidazolium tetrafluoroborate [C4mim+][BF4 −]. In particular, the effect of (i) water content, (ii) temperature, and (iii) nature of the room-temperature ionic liquid (RTIL) on the electrocatalytic behavior of these Pt NPs has been systematically evaluated. The obtained results show how important are those parameters, since the COads oxidation peak potential exhibits a great sensitivity depending on the water content, temperature, and nature of the RTIL used. Interestingly, the charge density associated with the COads electrooxidation peak strongly depends on the nature of the ionic liquid, which reflects the complexity of this electrocatalytic reaction in this media. Moreover, Pt NP electrocatalyst degradation in those RTILs, considered as a loss of electrochemically active area, has been evaluated and shows high stability despite the extreme potentials afforded in RTILs.

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Acknowledgments

This work has been financially supported by the MICINN (Spain) (project CTQ2013-48280-C3-3-R).

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Authors and Affiliations

  1. Instituto Universitario de Electroquímica, Universidad de Alicante, Ap. 99, 03080, Alicante, Spain

    Miguel A. Montiel & Jose Solla-Gullón

  2. Sorbonne Universités, UPMC Univ Paris 06, UMR 8235, Laboratoire Interfaces et Systèmes Electrochimiques, F-75005, Paris, France

    Carlos M. Sánchez-Sánchez

  3. CNRS, UMR 8235, LISE, F-75005, Paris, France

    Carlos M. Sánchez-Sánchez

Authors
  1. Miguel A. Montiel
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  2. Jose Solla-Gullón
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  3. Carlos M. Sánchez-Sánchez
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Correspondence to Carlos M. Sánchez-Sánchez.

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Montiel, M.A., Solla-Gullón, J. & Sánchez-Sánchez, C.M. Electrochemical reactivity and stability of platinum nanoparticles in imidazolium-based ionic liquids. J Solid State Electrochem 20, 1043–1052 (2016). https://doi.org/10.1007/s10008-015-3014-5

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  • DOI: https://doi.org/10.1007/s10008-015-3014-5

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