Study of the interface Pt(111)/ [Emmim][NTf2] using laser-induced temperature jump experiments

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Title: Study of the interface Pt(111)/ [Emmim][NTf2] using laser-induced temperature jump experiments
Authors: Sebastián, Paula | Sandoval, Andrea P. | Climent, Victor | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Ionic liquid | Platinum single crystal | Potential of zero charge | Potential of maximum entropy | Laser-induced temperature jump | Imidazolium
Knowledge Area: Química Física
Issue Date: Jun-2015
Publisher: Elsevier
Citation: Electrochemistry Communications. 2015, 55: 39-42. doi:10.1016/j.elecom.2015.03.012
Abstract: The interface between a Pt(111) electrode and a room temperature ionic liquid, 1-ethyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide, was investigated with the laser-induced temperature jump method. In this technique, the temperature of the interface is suddenly increased by applying short laser pulses. The change of the electrode potential caused by the thermal perturbation is measured under coulostatic conditions during the subsequent temperature relaxation. This change is mainly related to the reorganization of the solvent components near the electrode surface. The sign of the potential transient depends on the potential of the experiment. At high potential values, positive transients indicate a higher density of anions than cations close the surface, contributing negatively to the potential of the electrode. Decreasing the applied potential to sufficiently low values, the transient becomes negative, meaning that the density of cations becomes then higher at the surface of the electrode. The potential dependence of the interfacial response shows a marked hysteresis depending on the direction in which the applied potential is changed.
Sponsor: Support from MINECO (Spain) through project CTQ2013-44083-P is greatly acknowledged. Paula Sebastian acknowledges to the Generalitat valenciana for the award of vali + d gran.
ISSN: 1388-2481 (Print) | 1873-1902 (Online)
DOI: 10.1016/j.elecom.2015.03.012
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 Elsevier B.V.
Peer Review: si
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Appears in Collections:INV - EQSUP - Artículos de Revistas

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