First in an on-going series of Free Webinars - Basics of EIS presented live on March 26, 2020 hosted by Gamry Instruments and presented by Dr. Jacob Ketter.
Hi Meschac. The basics of our instruments, and how they function, can be found here: www.gamry.com/application-notes/instrumentation/potentiostat-fundamentals/ There are various models of instruments we offer to allow for measurements across a very wide impedance range. More information on each model can be found here: www.gamry.com/potentiostats/browse-all-potentiostats/ If you have any other questions, please feel free to email sales@gamry.com or techsupport@gamry.com, and one of our engineers would be happy to help!
If your KK transform doesn't fit your experimental data how can you change the conditions of your measurement (voltage amplitude....) to improve the fitting? And if it doesn't fit only at low frequencies, does it invalidate the rest of the spectra? In my case it fits the spectra in the high frequency range (which gives the most important information) and deviates later at low frequencies. Thank you in advance.
There can be many reasons why an overload may occur during an EIS test. You can send your data and cell setup information to techsupport@gamry.com, and one of our support engineers can provide feedback for your specific experiment.
[organic solar cells] Hey guys. Does anyone know how to extract diffusion coefficient, kinetic parameter and electrolyte resistance from EIS measurements in OSCs?
In many situations, EIS is run without DC polarization. Meaning, the DC polarization is set to 0V vs Eoc (Open Circuit Potential). This is so the spectra can be acquired at steady-state. There can be exceptions in cases of high impedance coatings, driving a fuel cell, etc, but these are less common. If you email techsupport@gamry.com, one of our engineers can discuss how to set a DC potential that is appropriate for your application.
There are no new webinars currently scheduled. Here is a link to the Registration Page: www.gamry.com/resources/webinars/ - keep checking as we will be scheduling new Webinars and Live Demos. There is a form on this page to register for the webinar you would be interested in. Thanks for your support of Gamry
There is no valuable information obtained from plotting Impedance vs AC Voltage. The amplitude of the signal is only important in ensuring that you remain in the linear response region for your cell. If you have more questions, please feel free to contact techsupport@gamry.com
It is possible the FEC, which is added to help prevent blocking SEI formation, actually does some sort of blocking itself. This could slow the reaction down. It is also possible SEI is favored, and so the other path that it is pushed to has slower kinetics (and higher ET resistance). This phenomenon is not fully understood. Going to Research Gate may yield responses from the most up-to-date research in this field.
Thank you for your interest. All videos we currently have available can be found on our web site : www.gamry.com/resources/gamry-product-videos/ There are also Quick Start Guides available for all of our instruments: www.gamry.com/support/documentation-downloads/ --
An AC signal is used so that both the real and imaginary components of the overall cell impedance can be measured. This allows for both the resistance and inductance/capacitance to be measured. With a DC signal, only the real impedance can be measured.
The EIS dummy cell (also known as the AC dummy cell) we provide with our instruments uses a 1μF capacitor. So it is a known value from the hardware used. If you have additional questions, please reach out to our Technical Support Engineers at techsupport@gamry.com
The PDF is available at this link: www.gamry.com/assets/Uploads/BasicsOfEIS.pdf Visit the Video Library on our web site to view videos of all of our "Live" webinars and download the available PDFs of each -- www.gamry.com/resources/gamry-product-videos/
Thank you for your interest. Here is a link to the PDF version of this webinar: www.gamry.com/assets/Uploads/BasicsOfEIS.pdf Visit the Video Library of our web site to view videos of all our Webinars and to download the available PDF versions: www.gamry.com/resources/gamry-product-videos/
