Alternating-current measurements in scanning electrochemical microscopy, part 1: principle and theory

Dao Trinh; Michel Keddam; Xosé R Novoa; Vincent Vivier

doi:10.1002/cphc.201001084

Alternating-current measurements in scanning electrochemical microscopy, part 1: principle and theory

Chemphyschem. 2011 Aug 1;12(11):2169-76. doi: 10.1002/cphc.201001084. Epub 2011 Jun 1.

Authors

Dao Trinh¹, Michel Keddam, Xosé R Novoa, Vincent Vivier

Affiliation

¹ LISE-UPR du CNRS, Université Pierre et Marie Curie, Paris, France.

PMID: 21633998
DOI: 10.1002/cphc.201001084

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.