Episode

Описание: 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.

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 [email protected].

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Time stamps:
00:00 - Introduction
06:00 - Livestream starts
08:20 - When you do a 2 electrode CV and one electrode is an alloy (2 metals) and another electrode is pure metal, how does the potentiostat know whether to measure potential of metal 1 or 2 in the alloy vs pure metal?
17:13 - Does it matter if in the equivalent circuit the Rs is connected in series to Wo+Rct which are in parallel to CPE or if it's connected in series to CPE and Wo+Rct in parallel? Does it make a change?
33:00 - Can you explain what is included in the Warburg region? Is it only ion diffusion? Or even the electron? Is Warburg diffusion the diffusion of ions from the bulk to electrode surface? Or does it include the diffusion through the electrode pores like solid state diffusion?
37:06 - What would be the reason for having two semicircles? Does it only happen if I have two different materials so it's two different interphases where each has its own charge transfer resistance?
39:13 - For ions, what is the difference between migration of ions and the diffusion of ions? I thought that they were the same.
44:45 - Since solid state diffusion and bulk diffusion are taking place with different kinetics, can we deconvolute Warburg through some function like Fourier transform?
49:48 - Can you tell me about how to study the diffusion coefficient through the EIS Warburg tail? How fast is the bulk diffusion and the diffusion through the pores, can we know how fast is one compared to another?
57:19 - ​​Why is the CV of an electrode in a 2 electrode symmetric device so different from the 3 electrode system with a reference and counter electrode?
1:00:40 - ​​For a symmetric supercapacitor, the cations and anions are of different size and may be of different valency, so they are moving with different solvent spheres, hence their diffusion also will/should be different, right? But in symmetric devices they both appear in a single Warburg right? How can we deconvolute these?
1:05:30 - What does the polarization effect mean? I read it in many CV interpretations and they ascribed the CV curve behavior to it and the good reversibility by shifting the peaks at different scan rates.
1:09:15 - How can diffusion be the random motion of molecules in the Randles-Sevcik equation?
1:16:35 - If I want to insert the values of the CPE and Wo, both have 2-3 parameters, which one of these parameters actually expresses the element value? And the other parameter value, should it be included too?
1:22:05 - In Li-ion cells, can the SEI be the rate-limiting step via Li⁺ diffusion? Is it similar to the double layer capacitance?
1:31:50 - If I synthesize a material with very low porosity and one with extreme high porosity, how will the diffusion change? Can you plot the possible EIS spectra?
1:40:05 - In trying to recover metal using electrochemical methods, is CV the only method to recover metal or are there other electrochemical methods to recover or plate out metals?
1:42:33 - ​​In LIBs, do diffusion and migration typically oppose each other or contribute to flux in same direction?
1:45:49 - I have a test of electrochemistry but I have trouble in faraday's law. I know the formula but the concept is not clear.
1:54:03 - I guess the diffusion in battery is random? I think it's a kind of forced diffusion since there is potential associated with it, it's a forced diffusion with proper direction ​​the diffusion is random in diffusion NMR since there is no applied field, or anything but it's not the case in electrophoretic NMR
1:54:46 - Is Rct an intrinsic property of the material? And the electrolyte is in equilibrium? Or can we manipulate the Rct by making it more conductive? Or it will alter just the Rs value?