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• W2326020661 endingPage "3537" @default.
• W2326020661 startingPage "3531" @default.
• W2326020661 abstract "In scanning electrochemical microscopy (SECM), an approach curve performed in feedback mode involves the downward displacement of a microelectrode toward a substrate while applying a bias to detect dissolved electroactive species at a diffusion-limited rate. The resulting measured current is said to be at steady state. In order to reduce the required measurement time, the approach velocity can be increased. In this paper, we investigate experimentally and theoretically the combination of diffusion and convection processes related to a moving microdisk electrode during feedback approaches. Transient modeling and numerical simulations with moving boundaries are performed, and the results are compared to the experimental approach curves obtained in aqueous solution. The geometry and misalignment of the microelectrode influence the experimental approach curves recorded at high approach velocities. The effects are discussed through the decomposition of the current into transient diffusional, radial convectional, and axial convectional contributions. Finally a ready-to-use expression is provided to rapidly evaluate the maximal approach velocity for steady state measurements as a function of the microelectrode geometry and the physical properties of the media. This expression holds for the more restrictive case of negative feedback as well as other modes, such as SECM approach curves performed at substrates displaying first order kinetics." @default.
• W2326020661 created "2016-06-24" @default.
• W2326020661 creator A5008983918 @default.
• W2326020661 creator A5021540137 @default.
• W2326020661 creator A5070725375 @default.
• W2326020661 date "2012-03-28" @default.
• W2326020661 modified "2023-10-18" @default.
• W2326020661 title "Forced Convection during Feedback Approach Curve Measurements in Scanning Electrochemical Microscopy: Maximal Displacement Velocity with a Microdisk" @default.
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• W2326020661 doi "https://doi.org/10.1021/ac203047d" @default.
• W2326020661 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22385037" @default.
• W2326020661 hasPublicationYear "2012" @default.
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