Alternating-current measurements in scanning electrochemical microscopy, part 1: principle and theory
Dao Trinh1, Michel Keddam, Xosé R Novoa
1LISE-UPR du CNRS, Université Pierre et Marie Curie, Paris, France.
Abstract:
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.
Related Concept Videos
Interfacial Electrochemical Methods: Overview
Voltammetric Techniques: Linear-Scan (E vs Time)
Voltammetric Techniques: Cyclic Voltammetry
Amperometry: Overview
Voltammetry: Stripping Methods
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Controlled-Current Coulometry: Overview


