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How to measure the diffusion coefficient using a rotating disk electrode
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- Опубликовано: 10 авг 2024
- A common parameter electrochemists are interested in is the diffusion coefficient. In this video, Pine Research Instrumentation will go over how to calculate the diffusion coefficient using a rotating disk electrode. We have already collected rotating disk electrode data at different rotation rates. We will then use limiting current and the Levich equation to solve for the diffusion coefficient. We will also be going over some of the pitfalls and common errors we see people run into when trying to calculate the diffusion coefficient.
Video on determining the limiting current
• How to determine the m...
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#electrochemistry #RDE
Thank you for presentation
Glad you liked it!
Thank you for your very clear explanation about rotating disc diffusion coefficient calculation.
It would be great if you could put video on how to prepare a cell and perform the experiment.
Thank you once again 😊
I agree! When we've got some time, this will be another video we try to put out. Thank you for your suggestion
Thanks for your presentation 👍
My pleasure
Nice, thank you.
Your welcome
Nice...Thanks!.
Thank you too!
Hi! Great Video!
One question: do you have any Video on how to Measure and calculate the ECSA Loss of a Catalyst with a RDE?
Unfortunately, we do not. We would need access to some catalysts and perform some experiments in order to make that video. But this is a good idea for future videos, thank you.
A great informative video!!! When to use chronoamperometry and voltammetry??
It depends on what you are trying to do. Voltammetry is great when you are trying to determine at what potential you electrochemical events occur. Chronoamperometry is more quantitative when you already know the potential where electrolysis is occurring. Chronoamperometry has the added benefit where it's less dependent on the electrochemical double-layer, while voltammetry can generate a large background current depending on the scan rate.
great!!!
Hope this is helpful! Thanks for watching :)
Great video. Thx! One thing to point out. At 7:47, the concentration C should be 1 E-6 mol/cm3 instead of E6 cuz the initial concentration is 1 mM if I am not mistaken.
Yes, you are right. I forgot the minus sign. It should be 1x10^-6.
Do you have a “how-to” video on how to operate and collect data from your rotating disk electrode systems? Thank you for your time.
Unfortunately, I don't have a video like that. But in short, if you've done cyclic voltammetry, an RDE experiment is basically a cyclic voltammetry experiment performed at a slow scan rate (5-20 mV/s) while rotating the working electrode. So the data collection will be the same as a cyclic voltammogram. I'm thinking about making a setup and perform RDE experiment video in the future.
Hello
How come your slope units have (rad/s)^1/2 if your X axis is still RPM^1/2?
Thanks!
I will need to check in with one of our software engineers about that. I think we choose to automatically make it (rads/s)^1/2 because we knew that this was what people were going to be calculating so we made the jump to give users the number that's easiest to use for diffusion coefficient calculations even though instrumentally you work with RPM.
OMG... This video is a really helpful and easy explanation of whatever I did ^_^b I just know my research error such as rpm--> rad/s through the electrochemical book, but your explanation is very useful and clear for me.
But I am just curious about the viscosity(v) value, is it the measearment value or the paper value of the solution?
Anyway, I'd like to say again "Thank U" ^_________________^
I'm glad you enjoyed the video! Definitely stay tuned for more videos from us. The kinematic viscosity value is a literature value, we don't have the tools to calculate the kinematic viscosity separately.
Hii so im thinking the value you have given in your table for your concentration is off, you guys put (1x10^6) while 1 mM would be (1x10^ -6) i think you just missed the negative sign, but in replicating and trying to practice finding diffusion coefficient and doing lots of algebra we realized the mistake haha. Thanks for all of your videos love you guys at pine research!!!
Yes, great catch! You are correct, in the table I should have put a minus sign on the concentration. It should be 1x10^-6 M. I'm glad you enjoy the videos. More to come! :)
Sir how can we directly measure diffusion coefficient from eis data
Hey have several webinars that go over the topic, but you'll get a better understanding of calculating the diffusion coefficient using EIS from our infinite vs finite warburg diffusion video. ruclips.net/video/iK6HmAnD7GQ/видео.html
7:44 at this time, when you calculate the diffusion coefficient, slope's unit consists of A, s, rads. there is a rads unit! but your parameters (n, F, A, C, v, D) don't contain the rads unit. So I'm curious about how to remove the rads unit in your calculation???
Great question. Radians are unitless, so I simply removed it from the equation. a radian is the length of an arc of a unit circle divided by the radius. Both quantities are dimensions of length and hence they cancel each other out. I hope this helps.
Why do you not include the point 0|0 in the diagram? Then i get a bit higher slope (0,0000202593) and a higher diffusion coefficient D=1,86x10^-5 cm2/s . Thx for the help
Sorry for not responding to you earlier. Your comment got caught in the "held for review" section. You could use 0|0 when calculating the slope. I would say that you'll always have some level of noise and possibly get a current that's not equal to zero at zero RPM. The calculated diffusion coefficient you got isn't all that bad when compared to literature.
Thanks for this! what software do You use? Also, I would love to Be friends xo
I'm using AfterMath Software. You can download is for free on our website. pineresearch.com/shop/kb/knowledge-category/software/
"5 hours later" 😂😂
Yup! :D