Introduction to Electrochemical Impedance Spectroscopy (EIS: Maths and Theory)
Рет қаралды 51,746
Күн бұрынLecture deliver as part of a series from the Electrochemistry Network for graduates at Imperial College London (17/02/2021).
Dr Sam Cooper - www.imperial.ac.uk/people/sam...
If you enjoy this style of teaching, try my Mathematics for Machine Learning specialization on Coursera:
www.coursera.org/specializati...
Follow me on twitter:
/ camsooper
And the tldr group:
/ tldr_group
github.com/tldr-group
Slides: www.dropbox.com/s/2dxnssou0gz...
00:00 - Introduction
01:53 - Linearity
04:23 - The classic idealised components: L, R and C
07:49 - Hydraulic & mechanical analogies for circuits
16:59 - Scenario #1 : Just a resistor
19:12 - Scenario #2 : Just a capacitor (take 1)
21:28 - The big muddle and Fourier transform
27:00 - Scenario #2 : Just a capacitor (take 2)
30:21 - Scenario #2 : Just a capacitor (take 3)
33:09 - Scenario #3 : R and C in series
36:02 - Convenient representation
38:31 - Parallel circuits
41:59 - Scenario #4 : R and C in parallel
46:49 - Question on potentiostats
51:32 - Nyquist plots
54:14 - Nyquist plot of a resistor
55:48 - Nyquist plot of a capacitor
58:29 - Nyquist plot of an inductor
59:45 - Nyquist plot of series RC
1:04:12 - Nyquist plot of parallel RC
1:13:25 - The simplest complicated system
1:23:12 - The simplest complicated system animation!
1:24:41 - Constant Phase Elements (CPEs)
1:32:33 - Distribution of relaxation times (DRT)
1:33:57 - Warburg and DRT equivalence to infinite series
1:35:59 - Gerischer elements
1:36:50 - Simple equivalences of parallel RC to R or C
1:38:31 - My research #1 : Diffusion impedance
1:39:57 - My research #2 : The electrode tortuosity factor
1:40:38 - Copper or "copper"?
1:40:59 - Symmetrical cells are tricky!
1:41:43 - Goodbye :-)
@lvnar_ice4159 3 жыл бұрын
Sam! You are the boss! Next time your doorbell rings during class, it will be my flowers arriving! Thanks for the lecture
@anweshidewan3405 2 жыл бұрын
This is just amazing. Probably the best introductory lecture video I found on KZfaq on EIS.
@arinanadeina9629 2 жыл бұрын
I love the way Dr. Cooper delivers information, always greatly enjoy your talks
@alecjasper 3 жыл бұрын
This is great. I think I will distribute this at my Institute (Karlsruhe Institute of Technology, Institute of Applied Materials - Electrochemical Technologies). I got to know you from your talk on the ARTISTIC webinar series last year. I am currently working on electrode design for lithium ion batteries and this will help me a lot parametrizing my P2D model.
@muktiranjanmohapatra9785 Жыл бұрын
The best lecture for someone who wishes to brush up the EIS chapter. Thank you Sam🙏
@mohammadshahin9139 2 жыл бұрын
Priceless! Please make more courses available on KZfaq. Your teaching skills are too rare and valuable to not do more for the public. Thank you so much!
@mohammadshahin9139 2 жыл бұрын
I can't beleive how good the rope example was. I'm somebody who works with a potentiostat but never reached such a point of general understanding of what actually happens in those wires!
@mohammadshahin9139 2 жыл бұрын
Puff of air under the sheet! That got me both happy and laughing. Happy that I finally have a clear example in my mind about the situation, and laughing at how simple but close the example is.
@PMuXeA 3 жыл бұрын
This was amazing! Vrey clear and I really liked the analogies. Thank you very much!
@al_musofirmotors 3 жыл бұрын
Thank you. It was very informative. Concepts were explained very well. Hope to see more in this area from you
@forestgreen8949 3 жыл бұрын
Very inspiring and rich content, thank you, Sam 👍👍👍
@himanisaini6947 2 жыл бұрын
Thank you Dr. Cooper, Quite informative to understand the basics of EIS. 😊👍🏻
@dr.sreejithpbabu5116 3 жыл бұрын
Congratulations...! You have a new subscriber. :D Frankly, I had no idea that I was going to enjoy EIS so much, until this lecture...! And I am quite surprised to see that I actually sat through the whole lecture in one go. Thank you.
@sajoco 3 жыл бұрын
Thanks Sreejith - binge watching EIS is the best way! 😅
@jonathansonnenschirm8535 2 жыл бұрын
greeeeat video. helped me a lot! coincidentally, i will be going to imperial college in a few months and this video is part of my preparations. what a small world...
@md.akibhasan5633 2 жыл бұрын
this is really amazing . nicely explained.
@anwarhossain-xf4mi Жыл бұрын
Thank you for this excellent video. This is just amazing.
@raghavsarda9396 3 жыл бұрын
Thanks a lot! This was much needed
@ahuja56 2 жыл бұрын
Fantastic lecture. Really enjoyed it!
@danielrueda638 3 жыл бұрын
Amazing lecture, congratulations
@maedeharvani4124 3 жыл бұрын
I enjoyed every minute of your lecture. Thank you very much!
@sajoco 3 жыл бұрын
Very kind of you to say, thanks!
@prakashjoshi4386 2 жыл бұрын
Excellent lecture !!
@momoya1125 3 жыл бұрын
As a master's student, this is the easiest course I have ever seen!! Thanks You~! Hope it will be explained about Warburg Thanks!!
@solimanai 3 жыл бұрын
Thank you for the great lecture
@randb1235789 2 жыл бұрын
Thank you so much ! Really like the lecture.
@ashokesengupta2889 2 жыл бұрын
Outstanding presentation. I like it. Great!!!
@kianasabzehei4350 2 жыл бұрын
Very useful. thanks for the presentation 👌
@SohamChakraborty42069 2 жыл бұрын
Great video and great explanation. Really shows the amount of effort that went into this video. You have a new subscriber! :D Also, really liked the part when someone sent you flowers!
@jjjjjjjjjjj12345 3 жыл бұрын
Thank you so much for the excellent lecture!
@sajoco 3 жыл бұрын
My pleasure!
@alisajedi-moghaddam1783 Жыл бұрын
I enjoyed your presentation. Thank you
@syedasadmanzoorbukhari7585 3 жыл бұрын
Fantastic video. Would be great if you can make one on analyzing the data and correlating with systems being investigated
@whocares2462 3 жыл бұрын
Really love this video, thank you! Do you have any good starting points about reading more about the impedance behaviour in porous systems? Especially porous electrodes would be interesting. Wouldn't that be a typical case for a semi-infinite Warburg element?
@yangli3932 2 жыл бұрын
It is a very informative video. Thanks for your good explanation.
@francescocaddeo981 3 жыл бұрын
Really amazing lecture
@DineshKumar-wv1uq Жыл бұрын
Thanks much for the wonderful video👍
@yarikpro01 2 жыл бұрын
Just WOW ! ! ! Awesome ! ! !
@manuelvazquez2667 3 жыл бұрын
Great explanation
@wneo7499 3 жыл бұрын
Thanks a lot.
@Shontushontu 2 жыл бұрын
Absolute legend!
@mayanksingh1213 Жыл бұрын
Thank you
@DW-iq8lt 2 жыл бұрын
Thank you for the nice presentation! Will you consider to make a second video regarding how to model all process in a battery into the RC equivalent circuit?
@gilbalby 3 жыл бұрын
Amazing lecture, Dr. Cooper! Some authors showed either faradaic and non-faradaic proccess in the diffusion bulk solution or charge transfer effects. So how can we describe this two proccess (faradaic and non-faradaic) for the Nyquist plot and the circuit equivalent components?
@Jofferpg2009 2 жыл бұрын
T H A N K Y O U! It helps a lot. We can´t find out some of these information even in books.
@user-mb8ml2pe9w 3 жыл бұрын
와... 엄청난 강의다
@sajoco 3 жыл бұрын
Thank you! :-)
@drprince8766 26 күн бұрын
Why did you stopped uploading videos. Great video this.
@eyalpras2428 2 жыл бұрын
Excellent explanation on this topic! I have a question regarding EIS for large Li ion battery cells (over 50Ah, prismatic or pouch). the impedance of these kind of cells is significantly lower than the typical cylindrical cells so how can you "wake up" these cells?
@Marc-fg1mn 3 жыл бұрын
Sam, would some "funny shape" fillers/ pigments/ additives for organic coatings impact the shape of a Nyquist plot? And, could they change the spectrum in such a way that the analyst could think there is a reaction where, in fact, it would be just a response of the system?
@yogesh2707 3 жыл бұрын
how to do it for the samples of thin film on ito , fto
@NickWiele Жыл бұрын
Hi Dr. Cooper, thanks for the great Video. Could you please tell me which tool you used to simulate the circuit in your animation? 😊
@sajoco Жыл бұрын
Just a little matlab script
@emmanuelonyekaezeoba6346 3 жыл бұрын
This was an amazing lecture Dr. Cooper. I however have one question. I understand that we obtain the capacitance of the system from the value of tau-c. What is the physical significance of the tau-c? What information does it give us about the system being measured? :-)
@sajoco 3 жыл бұрын
Thank you Emmanuel! Perhaps one way to think about it is the following: let’s say you measure a system and extract an impedance spectrum. At each frequency you now have an impedance value. If you had a simple semi-circle shape only, you might assume a parallel RC circuit. You could then immediately determine the value of R from the more frequency intercept. However in order to work out C you could either use a circuit fitting package (like Z-view) to fit the semi-circle, or instead just read off the frequency at the top of the semi-circle (remembering that tau_c = RC). Once you know C, you have to hypothesis about what is physically causing this capacitance in your system. Think of it like a blocking spring somewhere, for example, liquid ions packing densely together (due to a voltage) near the surface of an electrode. When the voltage is relaxed, the ions will spring back to a lower energy configuration. If the capacitance is very high, it might suggest that your material has a very high microscopic surface area for example.
@joseRodriguez-zi9cy Жыл бұрын
Hello, Good morning, I appreciate the knowledge shared on this channel. Studying about the EIS technique I have a doubt that I have not yet been able to solve clearly, the question is What does it mean that a material has its phase angle at lower or higher frequencies than another material? In which of these cases would there be a higher resistance to corrosion?
@AJ-ii1ej 2 жыл бұрын
Great work. I have a question. Why imaginary part is negative and what is characteristic frequency?
@maadel-dalahmeh1583 3 жыл бұрын
This is so great, can you please recommend some references books in this topic Thanks
@sajoco 3 жыл бұрын
Thank you! I've never found an EIS textbook that I particularly like, but Matt Lacey's blog is lovely: lacey.se/science/eis/, the GAMRAY website is amazing www.gamry.com/application-notes/EIS/basics-of-electrochemical-impedance-spectroscopy/ and KIT puts out some excellent stuff.
@maadel-dalahmeh1583 3 жыл бұрын
@@sajoco Thank you so much !
@s.m.talhawadood5852 3 жыл бұрын
Can we get the presentation slides please? Loved it, helped me a lot
@sajoco 3 жыл бұрын
Link now in the description!
@vermashwetank 3 жыл бұрын
Are the other lectures in this series available publicly?
@sajoco 3 жыл бұрын
Not yet I don’t think.
@JuanRodriguez-fv3hp 2 жыл бұрын
How Can I reach the stable state with a coating electrode? What technique can I apply before the EIS study and how I know the stable state is reached?
@abdulkadirbiffo8937 3 жыл бұрын
Hi Sam! Do you have some recommendations for SYMMETRICAL CELLS? I'm working on this and need to understand the chemistry behind it. I'll appreciate your recommendation. Thanks for your time.
@sajoco 3 жыл бұрын
I'm afraid I don't have any specific recommendations. I vaguely remember watching a great talk on this by Bernard Boukamp, but don't think it was recorded.
@abdulkadirbiffo8937 3 жыл бұрын
Many thanks for your response, Sam. I really appreciate 🙏🏿.
@sajoco 3 жыл бұрын
I'm not sure i do really. Some tips - if you do impedance at either 0% and 100% state of charge, you're gunna have a bad time because you cant lithiate more than 100% or less than 0%...
@maedeharvani4124 3 жыл бұрын
Thanks for the great lecture. What is alfa, I mean alfa in the Z CLE Formula, in physics?
@sajoco 3 жыл бұрын
One way to think about it is the ratio of capacity to resistance in the component. alpha=0 means no capacity (it's a resistor), alpha=1 is no resistance (its a capacitor). So you might have a kind of faulty capacitor where the more capacitance you want to access, the more energy loss (resistance) you have to pay
@maedeharvani4124 3 жыл бұрын
@@sajoco Thank you very much! We are blessed having such a wonderful lecture.
@hafizmuhammadfahad3020 3 жыл бұрын
Could you provide me a book on this topic, please.
@shaw8234 2 жыл бұрын
1:20:43
@shaw8234 2 жыл бұрын
1:15:10
@shaw8234 2 жыл бұрын
1:20:43
@craghopp2 3 жыл бұрын
Were the flowers nice?
@sajoco 3 жыл бұрын
Beautiful!
@MizanurRahmanITA 3 жыл бұрын
1:01:25 that's funny
@BS-my2ky 2 жыл бұрын
As an EE student, I found this material is overly complicated. So the first hour is about phaser. The next part is about circuit components in series and parallel solving using phasers. Characteristic frequency is where half the current contribution is flowing from the resistor and half is on the capacitor. When you daisy-chain multiple parallel RC blocks you just have multiple taus. I watched the whole 2 hours and still didn't get the point of EIS. Do you want to sweep the frequency and look at the output response to characterize the system?
@zhezhang4828 Жыл бұрын
just too basic for electrical guys when he talks about basics of impedances in the first one hour unfortunately.
@lanqian3382 Жыл бұрын
the math lost me
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