Title: Electrochemical impedance spectroscopy
– terminology, nomenclature and data exchange formats
Chairman: Z. Stoynov
C. Brett, M.
Orazem, and J.
The aim of this project is to summarize, standardize and disseminate
the nomenclature of fast developing new fields of application of electrochemical
impedance spectroscopy. It is also targeted to standardizing conventions
of formats for experimental data exchange and analysis.
The IUPAC recommendations "Impedances of electrochemical systems:
terminology, nomenclature and representation. Part I. Cells with metal
electrodes and liquid solutions" M. Sluyters-Rehbach (Pure Appl.
Chem., 66 (1994) 1831-1891) covered the basic knowledge
of the field. Since that time electrochemical impedance (often now
known as Electrochemical Impedance Spectroscopy (EIS)) has been developed
very actively and now a large variety of systems are investigated
by this method. In addition, new types of impedance analysis are being
developed - multiple transfer function analysis, local impedance measurements,
differential impedance analysis etc.
Many scientists from many different fields - chemistry,
, physics, biology, materials science, corrosion - are now using EIS
as a research tool owing to the ready availability of instrumentation.
This is made clear through the success of the triennial series of
symposia on Electrochemical Impedance Spectroscopy (the 5th held 17-22
June 2001 in Italy with 200 participants). It is important that conventions
and a common data format are implemented in order to facilitate application
and understanding of electrochemical impedance data by scientists
with different backgrounds and training, including for dissemination
through Internet and Virtual Laboratories. These conventions should
include: programming of the experiments and obtained data, recommended
algorithms for data pre-processing and analysis, and representation
of final numerical and graphical results. Such guidelines are important
for the chemistry community as a whole.
It is expected to incorporate these recommendations
in future ISO standards. A working group has already been formed for
this purpose regarding the application of impedance to measurement
of the effectiveness of organic coatings (ISO DC35 SC9 WG29, chairman
June 2005 - The work is complete and the paper written for
two of the three items, namely the aspects of nomenclature and data
exchange formats. The first draft of the paper for terminology or
definitions aspect resulted in 70 pages, which is currently being
reduced to about 20 pages.
Last update: 13 September 2005