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Alternating‐Current Measurements in Scanning Electrochemical Microscopy, Part 1: Principle and Theory
Author(s) -
Trinh Dao,
Keddam Michel,
Novoa Xosé R.,
Vivier Vincent
Publication year - 2011
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201001084
Subject(s) - scanning electrochemical microscopy , ferrocyanide , electrochemistry , substrate (aquarium) , scanning probe microscopy , diffusion , microscope , analytical chemistry (journal) , chemistry , microscopy , materials science , nanotechnology , optics , thermodynamics , electrode , physics , chromatography , oceanography , geology
The development of the scanning electrochemical microscope in ac mode is presented from both experimental and theoretical point of views. The experiments are performed with the ferri/ferrocyanide redox mediator as model system. Based on analysis of the frequency‐dependent collection efficiency, diffusion between the probe and the substrate is investigated, and analysis of time constants allows evaluation of the size of the sensing area under investigation. The experimental results are in good agreement with numerical simulations.