Happy holidays! Great short lecture. Thank you so much. As a next video idea as you asked in your video, I'd love to see a similar video for Square Wave Voltammetry and its applications on SPEs.
At 16:50 you mention that there is hardly any electrochemistry occuring at very high scan rate. But why there is such high current then? What is the source?
The source is that you keep on changing the voltage so you keep on causing a charging current, the charging is not telling you about your analyte it's telling you about the movement of ions in your solution - if you need more please reach out here - www.zimmerpeacocktech.com/contact-support/
Very nice presentations ZP on your channel and website. I'm not sure if my experiments are not going right because of enzymes or using electroanalytical methods wrongly. In the sensor I'm working on, I need to drive the reduction of Ferri to Ferro with a CA to measure the concentration of the substrate of some electroactive protein, in a process where FeCN should be the final electron donor. As I understand, the WE would be the source of electrons to drive this reduction. I'm able to get such a duck shape for my FeCN CV, am I correct to think that my CA should be set at a potential more negative than the potential of the reduction peak of FeCN? does it matter if I set it slightly positive (~50mV) of the reduction peak potential? Thanks in advance.
Thank you, sir, for your video. I have a request. I faced some problems in my experiment. when I connect the three electrodes and start to run the experiment, the scan direction becomes two lines, and it shows overflow even if it is at high sensitivity like 10-3. how can I solve this problem?
Once again, excellent video with strong and precious knowledge being transferred. I was wondering what happens to the shape of the CV when we increase the concentration of analyte? Can we add so much analyte that in similar scanning conditions we loose the diffusion limiting typical shape? Can we then say that this is a "kinetic" limited setup? Cheers.
The main difference is in the way you apply the potential. In short, in cyclic voltammetry , two linear potential scans in two different directions are applied, while in differential pulse voltammetry (DPV) a number of pulses are continuously applied to working electrode. Basically, DPV provides a higher degree of sensitivity and lower LOD. So, it’s commonly used in quantitative Analysis. On the other hand, CV is a very useful tool for studying electrochemical reactions, adsorption process and in general qualitative analysis. Square wave voltammetry is based on applying a staircase potential on which some square wave potentials are applied. The resulting current is twice sampled during each cycle, and the differential current is used to make the voltammogram. Since the nonfaradaic currents are considerably decreased , the sensitivity of SWV is much higher than other electrochemical methods. Besides, it provides very fast response times which makes it very suitable for chromatographic systems as a detector.
Please any one help me for solution this problem One gram of zinc metal dissolved in a solution of hydrochloric acid with a concentration of 6 molars, dilute it to 250 ml. Take 25 ml of it into a polarography cell, and the polarogram shows a voltage wave at -0.65 volts (assigned to Cd impurities), a diffusion current equal to 32 milliamps. If we add to the cell containing the zinc solution 5 ml of Cadmium chloride concentration is 0.0005 molar, and when taking a second crystalogram, the diffusion current was 77.5 milliamps. Calculate the weight percentage of cadmium impurities in zinc metal.
Thanks for the Video!! Helped me a lot with preparing for my experiment tomorrow!!
good luck with the science
I believe education must be such that it's short simple and to the point of clearest explanation, which is this video indeed!
Thank you, we will try to do more.
The greatest explanation I have ever seen…
Happy holidays! Great short lecture. Thank you so much.
As a next video idea as you asked in your video, I'd love to see a similar video for Square Wave Voltammetry and its applications on SPEs.
Hi thanks for this video, very informative and clear. Kindly make a video for Randler Sevick Eq. and Butler Volmer equation understanding.
At 16:50 you mention that there is hardly any electrochemistry occuring at very high scan rate. But why there is such high current then? What is the source?
The source is that you keep on changing the voltage so you keep on causing a charging current, the charging is not telling you about your analyte it's telling you about the movement of ions in your solution - if you need more please reach out here - www.zimmerpeacocktech.com/contact-support/
Thank you very much for this nice introduction! 😁
Thank you for the video, very informative!
Very nice presentations ZP on your channel and website. I'm not sure if my experiments are not going right because of enzymes or using electroanalytical methods wrongly.
In the sensor I'm working on, I need to drive the reduction of Ferri to Ferro with a CA to measure the concentration of the substrate of some electroactive protein, in a process where FeCN should be the final electron donor.
As I understand, the WE would be the source of electrons to drive this reduction. I'm able to get such a duck shape for my FeCN CV, am I correct to think that my CA should be set at a potential more negative than the potential of the reduction peak of FeCN? does it matter if I set it slightly positive (~50mV) of the reduction peak potential?
Thanks in advance.
please post in the link and we will answer in a webinar - www.zimmerpeacock.com/contact/
Thank you, sir, for your video. I have a request. I faced some problems in my experiment. when I connect the three electrodes and start to run the experiment, the scan direction becomes two lines, and it shows overflow even if it is at high sensitivity like 10-3. how can I solve this problem?
@@mulugashu3442 please post the problem here - www.zimmerpeacocktech.com/contact-support/
Not to be trite. But this entire video was gold.
Thank you
Thank you sir for this very well explained video. I would like to request for a similar Lecture video on "Electrochemical Impedance Spectroscopy".
We do have the material so we will do it
How does the shape of a cyclic voltammogram change when electrode kinetics are apparent?
post here - it's a good question - www.zimmerpeacocktech.com/contact-support/
Please more details on DPV and SPV when applied for biosensing
www.zimmerpeacocktech.com/contact-support/, post the request here and we wil include it in the next webinar on the 12 October
Can you make a video on cyclic Voltammetry plot using COMSOL Multiphysics Software...?
@SATYAPRAKASH-pr4vr please post your request here so Prof Peacock sees it - www.zimmerpeacocktech.com/contact-support/
thank you for this great lecture.
could you please teach us about impedance spectroscopy?
working on it at the moment - M
Once again, excellent video with strong and precious knowledge being transferred. I was wondering what happens to the shape of the CV when we increase the concentration of analyte? Can we add so much analyte that in similar scanning conditions we loose the diffusion limiting typical shape? Can we then say that this is a "kinetic" limited setup? Cheers.
We will answer here - ua-cam.com/users/live_UYhmnaMSfI?
@@zimmerpeacock9703 Sounds great, I'll be there!
Can we get some content on UME and steady state current/voltammetry.
Very nice. Thank you. 🙂
Thank you 😀
Nice. thanks.
Could you please explain the difference between differential pulse voltammetry and square wave voltammetry?
Of course, we will make that the next video
The main difference is in the way you apply the potential. In short, in cyclic voltammetry , two linear potential scans in two different directions are applied, while in differential pulse voltammetry (DPV) a number of pulses are continuously applied to working electrode. Basically, DPV provides a higher degree of sensitivity and lower LOD. So, it’s commonly used in quantitative Analysis. On the other hand, CV is a very useful tool for studying electrochemical reactions, adsorption process and in general qualitative analysis.
Square wave voltammetry is based on applying a staircase potential on which some square wave potentials are applied. The resulting current is twice sampled during each cycle, and the differential current is used to make the voltammogram. Since the nonfaradaic currents are considerably decreased , the sensitivity of SWV is much higher than other electrochemical methods. Besides, it provides very fast response times which makes it very suitable for chromatographic systems as a detector.
Hi can u explain FOWA analysis
Great idea- and something we will do
Please share the link of the paper of this lecture.
I wasn't referencing a paper, but I will write a book on this and then I can use this as the reference :)
Can you please share the link of the book.??
I am still writing it
Thank you sir
thank you
Please any one help me for solution this problem
One gram of zinc metal dissolved in a solution of hydrochloric acid with a concentration of 6 molars, dilute it to 250 ml. Take 25 ml of it into a polarography cell, and the polarogram shows a voltage wave at -0.65 volts (assigned to Cd impurities), a diffusion current equal to 32 milliamps. If we add to the cell containing the zinc solution 5 ml of Cadmium chloride concentration is 0.0005 molar, and when taking a second crystalogram, the diffusion current was 77.5 milliamps. Calculate the weight percentage of cadmium impurities in zinc metal.
Please paste the question here so the ZP team sees it - www.zimmerpeacock.com/contact/
@@zimmerpeacock9703
Thanks 🙏