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Differential ionic interaction in graphene electrodes quantified by in situ Raman spectroscopy

AuthorsDel Corro, Elena; Cruz, Jose Manuel de la; Delgà-Fernández, M.; Garrido, Jose A.
Issue Date2019
Citation9th edition of the Graphene and 2D Materials International Conference and Exhibition (2019)
AbstractUnderstanding the chargepotential landscape at the graphene-liquid interface is crucial when working with graphene electrodes, extensively used nowadays for biosensing or energy storage applications, among others. In this work we investigate the influence of ionic aqueous solutions on single layer graphene. Differently supported graphene electrodes were immersed in ionic solutions of increasing KCl concentration (at a constant pH). Impedance spectroscopy was used to calibrate the shift of the charge neutrality point of graphene with [KCl]. In parallel, chronoamperometric experiments and in situ Raman spectroscopy were performed to monitor the influence of the [KCl]. The change of the Fermi level in graphene was obtained from the shift of the energy of the G Raman band. This study reveals an intriguing behaviour. Our data show that there is a shift of the Fermi level in graphene with [KCl], when the the graphene layer is supported on an insulating substrate. Such a shift, however, is not observed when graphene is on a conductive substrate. By combining Raman and capacitance measurements on graphene electrodes we discuss the ion interaction and related charge induction mechanisms, which play a key role in the phenomena at the graphene-liquid interface, crucial for many applications such as sensors, energy storage, etc.
DescriptionResumen del póster presentado a la 9th edition of the Graphene and 2D Materials International Conference and Exhibition, celebrada en Roma (Italia) del 25 al 28 de junio de 2019.
Appears in Collections:(CIN2) Comunicaciones congresos
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