Electrochemical Impedance Spectroscopy

Influence of Chloride Ions on Electrochemical Corrosion Behavior of Dual-Phase Steel over Conventional Rebar in Pore Solution

“…Figure 6 shows the equivalent circuit, where Q is the constant phase element CPE, RS the solution resistance, W the Warburg impedance, and Rt the layer transition resistance. According to diffusion boundary conditions, there are three types of diffusion impedances for plane electrodes [39,40]. Warburg impedance, one of the common diffusion impedances, assumes the infinity diffusion layer thickness.…”

Caracterización electroquímica de recubrimientos Zn-Al sobre fundición nodular grado 2, obtenidos por proyección térmica por flama con alambre

“…F=σA ecu (1) [13] Donde: F: Fuerza de adherencia σ: Esfuerzo de adherencia A: Área desprendida Para evaluar el estado de corrosión y conocer la respuesta electroquímica del sistema, se aplican las técnicas de espectroscopia de impedancia electroquímica y ruido electroquímico [14]- [16], en una solución 0,1 moles de NaCl, con un tiempo de análisis de 300 h tanto para el sustrato como para el recubrimiento. Este ensayo se llevó a cabo en un potenciostato Gill AC, controlado por el software Sequencer.…”

Impurity Tolerance of Unsaturated Ni-N-C Active Sites for Practical Electrochemical CO2 Reduction

“…Electrochemical impedance spectroscopy measurements (Figure S24) were carried out with the electrodes. By fitting the equivalent circuit, we find that the resistance for charge transfer within the electrocatalysts is small and similar between each of the catalysts, indicating that the electrocatalysts are all highly conductive and hence display similar j . − Furthermore, double-layer capacitance values ( C dl ) of 0.95, 0.97, and 1.03 mF cm –2 were calculated for Ni-GS-800, Ni-GS-900, and Ni-GS-1000, respectively (Figure S25), indicating a similar electrochemical surface area of ∼50 cm 2 ECSA per cm 2 geometric for each catalyst. HER polarization testing (Figure S26a) confirms that the maximum HER activity for each catalyst at −1.0 V vs RHE follows the trend of Ni-GS-800 > Ni-GS-900 > Ni-GS-1000, in accordance with our results for FE H 2 (Figure b) for each catalyst.…”