Dataset of the electrochemical potential windows for the Au(hkl)|ionic liquid interfaces defined by the cut-off current densities

Abstract

This data article describes the linear sweep voltammetry (LSV) profiles of five ionic liquids (ILs) at the low-index ( hkl ) ( hkl = 111, 100, and 110) planes of Au. The LSV profiles were recorded at 25 ± 1°C for the Au( hkl )|IL interfaces maintained in a hanging meniscus configuration in an inert Ar atmosphere (with H 2 O and O 2 concentrations being lower than 5 ppm). The width of the electrical double-layer regions ( E dl ) and the electrochemical potential windows ( E pw ) of the ILs were evaluated based on the cut-off current densities ( j cut-off ): ±5, ±10, and ±20 µA cm –2 for E dl and ±0.1, ±0.5, and ±1.0 mA cm –2 for E pw . The potential values were calibrated to the redox potential of ferrocene/ferrocenium in each IL. A detailed discussion on the electrochemical behaviors of the ILs on Au( hkl ) is provided in the related article “Voltammetric Investigation of Anodic and Cathodic Processes at Au( hkl )|Ionic Liquid Interfaces”, published in the Journal of Electroanalytical Chemistry (Ueda and Yoshimoto, 2021).

Oxidized Kinetic Normal Distribution Models for Sophisticated Electrochemical Windows

“…Experimental and practical EWs of electrolytes in batteries are determined by the actual kinetically stable voltage range during the cycling process. The measurement of a stable voltage range is often simplified by linear sweep voltammetry (LSV), which inherently implies the redox kinetics as explained by the Gerischer theory and is applied as the most common and reliable method for the electrochemical oxidation potential. − In addition, LSV experiments exclude the influence of products, while other methods like cyclic voltammetry check more about products than the reactants. Note that the definitions of the EW for different materials in experiments are different: for variable-valence transition metal coordination compounds, EWs are often defined as the equilibrium potentials under the zero net current, while for the electrolytes of batteries, the EW is often simulated as the intersection of two extrapolated lines before and after the initial redox potential.…”