In situ SECM mapping of pitting corrosion in stainless steel using submicron Pt ultramicroelectrode and quantitative spatial resolution analysis

Nanoscale Electrochemical Mapping

“…74 Pt has also been grown at the end of a nanopipet and at nanopores using FIB to make bipolar nanoscale electrodes, and such an approach may be valuable in the future for making SECM tips. 76,77 SECM with tips on the submicrometer to 100s of nm scale have been deployed for electrochemical mapping of a wide spectrum of processes, ranging from studies of the corrosion of steel, 78 electrochemical characterization of complex electrocatalytic materials, 79 assessment of basal surface and step-edge redox activity in MoS 2 devices, 80 ion intercalation into graphene, 81 and investigation of charge storage capacity on redox active colloids. 82 The latter study is particularly noteworthy as it involved the use of SECM on a Raman microscopy platform.…”

Fitting Kinetics from Scanning Electrochemical Microscopy Images of Finite Circular Features

“…The examples here all assumed that the sample was perfectly smooth and that the RF was circular, but this method does not need to be limited by these assumptions. If the surface topography is known from a technique such as atomic force microscopy or profilometry, it can be explicitly simulated . Primitives other than circles that may be closer to the actual RF (such as a polygon or an ellipse) could be used, but they will increase the number of parameters that need to be fit.…”

“…If the surface topography is known from a technique such as atomic force microscopy or profilometry, it can be explicitly simulated. 25 Primitives other than circles that may be closer to the actual RF (such as a polygon or an ellipse) could be used, but they will increase the number of parameters that need to be fit. This would dramatically increase the already expensive computational cost of this method.…”

Electrochemical Study of a Hybrid Polymethyl Methacrylate Coating using SiO2 Nanoparticles toward the Mitigation of the Corrosion in Marine Environments

“…The evaluation of the performance of the PMMA and PMMA + SiO 2 coatings created, the scanning electrochemical microscopy (SECM, Biologic USECM470, Seyssinet-Pariset, France) technique was used. SECM is a powerful tool for obtaining localized information regarding corrosion on metal surfaces because it permits in situ characterization of topography and localized corrosion activity at microscale [25]. Measurements are performed recording electrochemical signals related to the interaction with the surface of a redox species in the solution phase [26], using a Biologic scanning system instrument model ac-SECM/SECM470, employing a four-electrode cell consisting of a platinum ultramicroelectrode (UME) of 25 µm diameter, a reference electrode of Ag/AgCl 3M KCl saturated, a graphite rod as an auxiliary electrode, and an ultra-microelectrode tip-to-sample distance of 19 µm was adjusted, which was obtained via the approach of curve recording in a 1 mM ferrocenemethanol (FcMeOH).…”

“…Measurements are performed recording electrochemical signals related to the interaction with the surface of a redox species in the solution phase [26], using a Biologic scanning system instrument model ac-SECM/SECM470, employing a four-electrode cell consisting of a platinum ultramicroelectrode (UME) of 25 µm diameter, a reference electrode of Ag/AgCl 3M KCl saturated, a graphite rod as an auxiliary electrode, and an ultra-microelectrode tip-to-sample distance of 19 µm was adjusted, which was obtained via the approach of curve recording in a 1 mM ferrocenemethanol (FcMeOH). A feedback model was used for SECM experiment, using a tip potential of 0.5 eV in order to detect the iron (II) species and obtain complete diffusion-limited electrochemical oxidation of FcMeOH to FcMeOH + [25,26]. In addition, 1 mM FcMeOH was used as a mediator in a simulated seawater solution (composition) as electrolyte.…”