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Communication Dans Un Congrès Année : 2022

Advanced investigations on the solid-liquid interaction between rGO films and aqueous electrolytes

Résumé

Reduced graphene oxide (rGO) has been studied in the recent years in different fields due a combination of physicochemical properties which can be engineered to prepare films exhibiting large electroactive surface area and high electrical conductivity. In the field of healthcare applications, rGO films have been widely studied because of their biocompatibility and their chemical and biochemical sensing capabilities [1]. In this respect, a fundamental understanding of key aspects such as the evolution of the functional groups of rGO during the reduction process and the role of ionic diffusion remains extremely relevant because their impact on the properties and the ultimate performance of rGO-based devices. In this work, combining different electrochemical as well as other spectroscopy techniques, we investigate the solid-liquid interaction between rGO-based porous electrodes and aqueous electrolytes containing a variety of ionic species (Li+, K+, Na+ and Cs+) as well as to evaluate the impact of the reduction degree of the film on the ionic diffusion and kinetics. A combination of X-ray photoelectron spectroscopy (XPS), contact angle, and Raman spectroscopy was used to characterize the evolution of functional groups upon the reduction degree of rGO [2]. Using scanning electron microscope (SEM) and quartz crystal microbalance with dissipation monitoring (QCM-D) we investigate parameters such as roughness and distance between the stacked rGO flakes in the porous films. The electrochemical properties of rGO are evaluated by cyclic voltammetry (CV) coupled with electrochemical quartz crystal microbalance (EQCM) techniques. To study the dynamics of the ionic transfer (charge and solvation effects) across the electrode-electrolyte interfaces we use the ACEQCM technique. This technique combines electrochemical impedance spectroscopy (EIS) and fast quartz crystal microbalance (QCM) to separate the contribution of different ionic species, thus complementing the classical EQCM results [3]. This work aims at expanding the current understanding of the properties of rGO-based porous films for their potential use as electrode material in healthcare and energy storage applications.

Domaines

Chimie
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Dates et versions

hal-03954277 , version 1 (24-01-2023)

Identifiants

  • HAL Id : hal-03954277 , version 1

Citer

M. Pilar Bernicola Garcia, Elena del Corro Garcia, Jose A. Garrido, Catherine Debiemme-Chouvy, Hubert Perrot. Advanced investigations on the solid-liquid interaction between rGO films and aqueous electrolytes. Journées d' Electrochimie 2022 (JE2022), Société Chimique de France, Jul 2022, Mons, Belgium. ⟨hal-03954277⟩
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