Impedance at a rotating disc electrode (part 1) I Mass Transport in EIS (E04)

Let's find out what the impedance spectrum of our redox couple looks like when we rotate the disk electrode. To understand this, let's first recall how and why cyclic voltammograms look when measured with rotating disk electrodes.

Timestamps
00:00 Intro
00:47 Recap: The Warburg impedance accounting for linear semi-infinite diffusion as an element in equivalent circuit diagrams and Nyquist plots
05:34 Lab experiment: Cyclic voltammetry of a redox couple with a rotating disc electrode (RDE)
07:19 Explanation of the shape of a cyclic voltammogram of a redox couple obtained with a RDE
16:27 Lab experiment: Electrochemical impedance spectroscopy of a redox couple with a RDE
18:48 Outro

This is the fourth video in our series 'Mass Transport in 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, Oliver Röth, and Julia Linnemann
filmed and edited by Christian Wunderle and Kathleen Schnaars

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). Sebastian Reinke 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.
Many thanks to Kathleen Schnaars for designing our Impe-DANCE T-shirts.