Episode #29: The difference between EIS, GCD, and CV in studying batteries

This is a Livestream Q&A/Ask Us Anything for answering YOUR questions on YouTube. In this Q&A session we will answer your electrochemistry research questions LIVE, as well as any other questions related personal topics like careers, academia, industry, or life in general.

Check out https://aftermathlive.com, Pine Research's online electrochemical simulation software! Perfect for the classroom or research lab, licenses are available for simulating CV and bulk electrolysis of a variety of chemical and electrochemical reactions. Accessible on both PC and Mac!

We have compiled a database of all questions asked in our Ask Us Anything About Electrochemistry Livestreams, tagged by the question subject and linked with time stamps to the place in that week's Livestream. If you are interested in obtaining a copy of this database (MS Excel file), please reach out via comments here or directly to us at pinewire@pineresearch.com.

Time stamps:
00:00 - Introduction
07:00 - Livestream starts
14:04 - Can you achieve laminar flow with the low volume RDE cell (8 mL)?
24:00 - Does CV provide a different perspective compared to GCD and EIS?
37:50 - In chronoamperometry (CA), how much of the current data is associated with diffusion of redox species and how much is the increasing size of the electrical double layer diffusion layer?
45:03 - How to obtain a reliable potential window on battery-type materials in CV, GCD, and EIS analysis?
51:58 - EIS already provides insightful information on SEI layer, charge transfer (intercalation/deintercalation), etc. What makes CV useful?
55:57 - How do you compare positive and negative potential scanning in CV? Some materials are scanned in positive potential and some in negative potential, what are you views about it?
1:01:49 - I made a porous SPE for heavy metal detection. The expert explained the EIS as RC couple, I added a Warburg short elements to the circuit fit, which decreased the chi2 by 100x. Is that enough to prove him wrong?
1:04:28 - I'm working on synthesis of thin films for electrochromic devices. I've observed that cathodic current density increases more than anodic current through CV. But the diffusion kinetics of intercalation/deintercalation remain almost the same for both films. How can you interpret these results?
1:08:49 - How to choose a particular pulse amplitude, frequency, and step voltage, scan rate for an Enzyme immobilized Ferrocene SAM on a gold SPE using square wave voltammetry? How much scan rate is too much?
1:19:05 - If the potential difference between oxidation peak and reduction peak is greater than 0.1 V, can we establish a diffusion phenomenon in our active material?
1:21:49 - How does the activation energy barrier increase or decrease when the transition state is similar to the reactant of product in the case of electrode processes?
1:29:59 - I am planning to perform EIS on a battery module. What should I interpret if I obtain a smooth output result? Since EIS data cannon be broken down from the module to a cell level.
1:35:20 - In a Nyquist plot, what does it mean when a linear capacitive line starts to deflect in the low-frequency range (100-10 mHz)? Which circuit element is the most suitable to describe this behavior?
1:42:41 - For the reduction of H+ to H2 using chronoamp, the slop is kinda odd, how can I determine the diffusion rates for the species?
1:45:08 - In an electrochemical cell, which is the negative electrode? Is it the anode because electrons are being transferred to it?
1:48:32 - If I get EIS data on a module, how could I breakdown that data from battery module level to cell level?
1:51:03 - In Butler-Volmer equation there's a term called the transfer coefficient which indicates whether transition state is similar to product or reactant. In the presence of EDL, Ea is affected?
1:56:52 - Is it possible to perform EIS on a zero gap MEA electrolyzer for CO2 reduction?
2:07:21 - If you did EIS on a module with 2 cells in series, would you expect to see 4 semi circles? 1 semi circle for each electrode? Or would the semi circles overlap with each other?
2:09:07 - Why is the three electrode system in EIS better than a two electrode system when we deal with battery systems in particular?

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