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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=windows-1251"> <meta name="Author" content="Genady Ragoisha"> <meta name="Description" content="Potentiodynamic electrochemical impedance spectroscopy - digital electrochemical technique for fast characterisation of electrochemical systems by multivariate response analysis."> <meta name="KeyWords" content="electrochemical impedance spectroscopy, potentiodynamic, PDEIS, frequency response, nonstationary interface, interfacial, virtual spectrometer, potential scan, potentiostat, ac probing, wavelets, multivariate data acquisition and analysis, digital, technique, monitoring, double electric layer, charge transfer, diffusion, adsorption"> <title>Potentiodynamic Electrochemical Impedance Spectroscopy</title> </head> <body> <h2 align="center"><font color="#000099">Potentiodynamic Electrochemical Impedance Spectroscopy</font></h2> <hr color="#0000CC"> <center> <b>PDEIS homepage </b> <a href="main_screen.htm">Spectra acquisition and analysis </a> <a href="vi.htm">Virtual instruments </a> <a href="articles.htm">Articles and preprints</a>  </center> <hr color="#0000cc"> <table> <tr> <td width="3"></td> <td width="300" valign="top"> <img src="diagram.GIF" alt="Potentiodynamic electrochemical impedance spectroscopy" width="305" height="396" usemap="#scheme" border="0"> <map name="scheme"> <area shape="rect" coords="99,9,296,84" href="main_screen.htm" alt="PDEIS spectrometer" title="Virtual spectrometer"> </map> </td> <td width="5"></td> <td valign="top"> <p>Potentiodynamic electrochemical impedance spectroscopy (PDEIS) is the technique for versatile characterisation of electrochemical responses of interfacial processes and structures. PDEIS acquires variable frequency responses in alternating current and a potentiodynamic dc voltammogram in the same potential scan, by probing the electrochemical interface with streams of mutually coordinated wavelets.</p> <p>PDEIS virtual spectrometer program acquires a potentiodynamic impedance spectrum by a common potentiostat connected to a computer with ADC/DAC interface. The object is placed in a common three-electrode electrochemical cell and the spectra are usually recorded in bidirectional potential scans, which give additional information on the extent of reversibility of different constituent processes that contribute to the frequency response of a nonstationary electrochemical interface.</p> <p> <a href="vi.htm">Virtual instruments</a> implement both the acquisition and analysis of the potential-dependent electrochemical response. In the potential scan, the multivariate data analysis gives a <a href="main_screen.htm">PDEIS spectrum and a voltammogram</a> in a 3D plot on a computer screen. After the scan, a built-in <a href="fit.htm">equivalent electric circuit analyser</a> decomposes the ac part of the interface response into constituents related to different interfacial processes and structures. Thus, potentiodynamic electrochemical impedance spectroscopy characterises, in a single potential scan, different interrelated processes (interfacial charge transfer, diffusion, adsorption, etc.) and interfacial structures (double electric layer, space charge layers, etc.) at non-stationary electrochemical interface. The separation of the constituent ac responses has enabled multiparametric monitoring of <a href="Te-Cu-Pb on Au.htm">atomic layer-by-layer deposition</a> in multilayer assembly, characterisation of nonstationary semiconductor systems by acquisition of <a href="Mott-Schottky.htm">variable Mott-Schottky plots</a>, monitoring of nonstationary stages of <a href="aniline_electropolymerisation.htm">electropolymerisation </a>and <a href="pdeis.htm"> mutually correlated adsorption </a>of cations and anions. </p> </td> <td width="5"></td> </tr> </table><br> <font size="-1">16.07.2013   <b>Freeware <a href="http://www.abc.chemistry.bsu.by/vi/analyser/">EIS Spectrum Analyser</a></b> update. Version 1.0 is available for download.<br><br> 29.08.2007   The Equivalent Circuit Analyser of the PDEIS spectrometer has been adapted to work with spectra of the common (stationary) impedance spectroscopy. The adapted part of the virtual spectrometer is available for download as a standalone program. For more information follow the link to <a href="http://www.abc.chemistry.bsu.by/vi/analyser/">EIS Spectrum Analyser</a>.</font><br><br> <hr color="#0000CC"> <table BORDER=0 WIDTH="100%"> <tr> <td width="15%"> <font size="-1"> </font></td> <td width="40%"><center><font size="-1"><b>Genady Ragoisha</b>, 2004-13<br>Research Institute for Physical-Chemical Problems<br>Belarusian State University<br> <img SRC="ragoisha_mail.gif" alt="e-mail"></font></center></td> <td width="15%" align="right">  <script type="text/javascript" language="javascript"> var sc_project=1714905; var sc_invisible=1; var sc_partition=16; var sc_security="64be920a"; </script> <script type="text/javascript" language="javascript" src="http://www.statcounter.com/counter/counter.js"></script><noscript><a href="http://www.statcounter.com/" target="_blank"><img src="http://c17.statcounter.com/counter.php?sc_project=1714905&java=0&security=64be920a&invisible=1" alt="free webpage counters" border="0"></a> </noscript>  </td> </tr> </table> </body> </html>