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conferenceseries
.com
Volume 7
Biosensors Journal
ISSN: 2090-4967
Electrochemistry 2018
June 11-12, 2018
June 11-12, 2018 | Rome, Italy
4
th
International Conference on
Electrochemistry
Python script in the processing of electrochemical impedance spectroscopy and current transient
measurements for the determination of the chemical capacitance
Daniel Andres Triana Camacho
Universidad Industrial de Santander, Colombia
B
ig data is defined in a variety of ways, including the search and retrieval of information to make decisions and;
the science behind the data when these are used to respond any question. On other hand, chemical capacitance (a
fundamental thermodynamic quantity related to charge accumulation at an electronic conductor/ionic conductor interface),
is conventionally obtained by electrochemical impedance spectroscopy (EIS). Herein, current transients (CT) are proposed
as an alternative measurement to determine the chemical capacitance. Thus, we describe a Python script to evaluate whether
chemical capacitance can be obtained by CT collected at multiple potentials. The experimental procedure was performed
with the redox pair Fe(CN)63-/ Fe(CN)64-, a model one electron outer sphere process, and applied to the derivation of the
chemical capacitance of the redox-active species on a Pt electrode. To validate the methodology here proposed is necessary
to organize, process, and matching between these two different types of measurements, like so display information in the
form of mathematical models, plots and files. Hence, we develop a protocol to analyze and compare a large amount of data
irrespective of time scale. Usually, the experimental data for CT and EIS are analyzed independently and in differents ways
by computational programs, for instance, repeating the sampling process for different times yields a family of curves named
“sampled current-voltammograms”, one for each time scale. In addition, EIS data may be presented in several types of plots
(e.g., Bode or Nyquist), which increase the volume of information obtainable from these measurements. Therefore, a getData
class was created to get and process the experimental data from CT and EIS measurements. To process the experimental data a
Python script was used to instantiate two objects: input and data objects. An input object is a javascript object notation (JSON)-
like object where the file name and the potential for experiment data are defined, thereby JSON object was implemented as a
Python dictionary. A data object is the instantiated getData object with the information contained in the data files referenced
in the input object. A Python script containing the input and data objects was created to process experimental data of FeIII/
FeII redox pair in solution. A total of 64 data files were obtained with NOVA 2.0 software for electrochemistry. Each CT data
file contains approximately 15000 experiment numbers, and EIS, 305. With instantiate getData object the capacitance curves
against potential from EIS and CT was constructed and compared in an easier way than process data with traditional tools
used in electrochemistry. It is concluded that at a specific condition of time scale, the integral of CT and EIS measurements
give similar results of capacitance.
dantrica@saber.uis.edu.coBiosens J 2018, Volume 7
DOI: 10.4172/2090-4967-C1-003