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Theory and Simulations for the Electron Transfer/Ion Transfer Mode of SECM with Electroactive Species Present in Both Liquid Phases
Author(s) -
Oleinick Alexander,
Yu Yun,
Mirkin Michael V.,
Svir Irina,
Amatore Christian
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800793
Subject(s) - scanning electrochemical microscopy , electrochemistry , electron transfer , ion , microelectrode , analytical chemistry (journal) , substrate (aquarium) , electrode , materials science , chemistry , chemical physics , chromatography , oceanography , organic chemistry , geology
The electron transfer/ion transfer mode of scanning electrochemical microscopy (SECM), in which a nanopipette containing a solvent immiscible with the outer solution is used as a tip to approach a microelectrode substrate, is investigated by simulations in order to analyze the effect of the electroactive species being simultaneously present inside the nanopipette and in the external liquid phase. The simulations consider conventional transport modes of the species inside the nanopipette as well as in the bulk solution coupled with their transfer across the liquid‐liquid nanointerface supported at the nanopipette tip. The shapes of the simulated approach curves (tip current vs. tip‐substrate distance) are highly sensitive to the ratio of initial concentrations in the nanopipette and in the outer solution for a given partition coefficient value providing a direct method to determine its value. The effect of the 1 st and 2 nd order homogeneous reaction consuming the product electrogenerated at the microelectrode surface onto its collection by the nanopipette is also presented.