How to calculate the charge from a cyclic voltammogram

Are you trying to determine the number of molecules converted in an electrolysis experiment? This video will go over how to calculate the charge in a cyclic voltammetry (CV) experiment using the area tool in AfterMath.
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[@ranaarslanafzal4452]

Do you have some video on calculating active electrochemical surface area?

[@Pineresearch]

We don't have a video on that, but that is a very good idea. We get a lot of questions about calculating the electrochemical surface area.

[@shatrudhanpalsaniya9953]

Thank you for the video sir. May you please tell about how to determine number of electrons from the CV, Amprometric or any method. Actually that "n" I want to use in Cottrell equation. Thank you

[@Pineresearch]

There are several techniques that can be used to determine the number of electrons transferred. Generally speaking, using something like the Cottrell equation to determine N, requires knowing the values of all the other variables and then solving for N.

[@milandey4121]

Nice video. How to calculate amount of charge stored during charging of a capacitor and released during the discharge from Cyclic Voltammogram using after math?

[@Pineresearch]

Hello Milan, great question. When using cyclic voltammetry it would be the same process. Look at the current vs time plot, and use the area tool to calculate the charge. For a capacitor, the current response would look like a rectangle (so you wouldn't find peaks like you would with a diffusion controlled redox couple). I would start the calculation from 0 current on the Y-axis. I hope this was helpful!

[@milandey4121]

@@Pineresearch Thanks, Agreed , calculation from 0 on the Y axis is justified when the CV is more or less parallel with the x axis. but when polarization resistance or charge transfer resistance is there in parallel with the capacitance, CV gets tilted, although, maintaing quasi rectangular shape, can we still start the calculation from O current on Y axis or some other way needs to be applied to get those values?

[@Pineresearch]

@@milandey4121 That's a good point. I think you could still extrapolate the charge from the capacitor. I would try to look at the tilt in the rectangle and make a baseline correction. This will require moving the dots around until you get a baseline that is parallel with the tilt you are observing. I might give that a try.

[@amani6433]

Please how can i calculate how many molecules passed using farady ‘s constant and the charge . Can you give me the equation please

[@Pineresearch]

Hello Amani. Once you determine the number of coulombs of charge from the area under the curve, you need to divide that number by Faraday's constant (96500 C/mol). You will then be left with the number of moles. Multiply the number of moles by Avogadro's constant (6.02x10^23) to get the number of molecules. I hope this was helpful. Please let me know if you have any further questions.

[@trialshade9612]

Sir..how you draw this current Vs time graph....I am using origin lab..unable to draw this

[@Pineresearch]

What kind of data are you working with? If you only have current vs potential data you would need additional information about how often a data point is collected to get the current vs time data.

[@trialshade9612]

@@Pineresearch okk thank you soo much sir

[@DERIDJZINEB]

please; what software do you use?

[@Pineresearch]

In this video we use AfterMath software, which you can download for free on our website. pineresearch.com/shop/kb/knowledge-category/software/
You only need to create a free account to download the software.

[@DERIDJZINEB]

thank you so much @@Pineresearch

[@DERIDJZINEB]

please; could you help how how to interpret the results of cyclic voltammogram@@Pineresearch

[@Pineresearch]

@@DERIDJZINEB We host an "Ask Us Anything about Electrochemistry" Livestream on Fridays at 1 pm EST, you can join us there and we can talk about it. If you join our UA-cam channel as a member you can join us on the livestream to share your data and we can talk about interpreting your voltammogram.

[@zinebderidj2876]

Okay it's very interesting . Thank you so much

[@vantuannguyen7341]

Hi, how I can export my excel data to aftermath ? I am using cyclic voltammetry. Thank you so much.

[@Pineresearch]

Hello. Sorry for the late response. Were you able to get this issue resolved? If not please email use at [e-mail]

[@maglumura6222]

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[@Pineresearch]

We are working on it my friend.