What is a time constant? | Basics of EIS (E04) | Electrochemical Impedance Spectroscopy

We begin to combine resistors and capacitors in circuits and focus on the term "time constant". We get a first look at how electrochemical systems are characterized by time constants. Timestamps 00:00 Intro 00:03 Recap: Mathematical origin of impedance 03:08 Lab experiment: Current responses of series RC circuits to voltage steps 06:27 Lab experiment: Current response of a (capacitive) electrochemical interface to a potential step 08:12 What is a time constant? 19:22 Outro 19:34 Summary panel (Endcard) This is the fourth video in our series 'Basics of EIS', which we created to support the Electrochemical Impedance Spectroscopy lectures of the Master's program in Chemistry and our research student interns at the Ruhr-University Bochum (RUB) in Germany. Since getting started with EIS can be challenging, our goal is to make it accessible regardless of prior knowledge. We provide detailed explanations of the key terms and experimental examples to help viewers understand the concepts, fill in gaps, and promote connections within their knowledge maps. In this way, we hope to prepare our students and interested electrochemistry enthusiasts for more advanced topics in EIS, such as those covered in the Electrochemistry I and II courses at RUB. #EIS #impedance #electrochemistry #education written and presented by Sebastian Reinke, Ravindra Shashindra, and Julia Linnemann filmed and edited by Christian Wunderle Website: https://shape-ec.ruhr-uni-bochum.de/ Acknowledgements: We are grateful for financial support from the Stiftung Mercator (project [e-Speicher]3, project ID 18023) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under CRC 247 project-ID 388390466 (project A09). S.R. thanks the Deutsche Bundesstiftung Umwelt (DBU) for a doctoral scholarship. The videos were recorded at the “Center for Solvation Science ZEMOS” funded by the German Federal Ministry of Education and Research BMBF and by the Ministry of Culture and Research of North Rhine-Westphalia. We would like to thank Kathleen Schnaars for designing our Impe-DANCE T-shirts.