Dear researchers
I see clear redox peaks in CV, but i did not plateau in the charge-discharge curves. Does anyone know the reason?
Dear Aram Mahmoodi ,
yes, it is possible to see a redox peak, e.g. in a two-valued (or multivalued function), CV[1], while it is possible to observe not[2] any (quasi-) plateau(s) in (fast driving) charge-discharge curves[3], since, here, commonly, we use a Current source.
1. Driving CV(s), commonly, by a Voltage source.
2. A well known, similar, case, in semuiconductors, is the i-V of a Tunnel diode https://en.wikipedia.org/wiki/Tunnel_diode
3. We drive, commonly, charge-discharge curve(s) by a Current source.
Dear professor Yuri Mirgorod
Do you have any ideas to answer this type of question?
You should have got the plateau in GCD curves too. However, comparing GCD and CV with single scan rate and GCD with single specific current is difficult. Further, the GCD curve is odd, as it shows charge time is much lesser than the discharge time. Which electrolyte you are using? One more question, just for confirmation; both CV and GCD curves are obtained from 3-electrode measurements, right?
Dear Dr Edmund Samuel
Thank you for answering this question
Yes, the electrochemical system has 3-electrode and electrolyte was 6.0M KOH. I did repeat these measurements many times but i didn't see any plateau in GCD curves. However, the CVs have clear redox peaks. charging time is about 600 seconds and discharge time is about 700 seconds.
Dear Aram Mahmoodi ,
yes, it is possible to see a redox peak, e.g. in a two-valued (or multivalued function), CV[1], while it is possible to observe not[2] any (quasi-) plateau(s) in (fast driving) charge-discharge curves[3], since, here, commonly, we use a Current source.
1. Driving CV(s), commonly, by a Voltage source.
2. A well known, similar, case, in semuiconductors, is the i-V of a Tunnel diode https://en.wikipedia.org/wiki/Tunnel_diode
3. We drive, commonly, charge-discharge curve(s) by a Current source.
Dear professor Ioannis Samaras
I very appreciate your taking the time to respond to my question.
Dear professor Ioannis Samaras
I am responding to referees comments on my article's revision. I am so sorry, can you introduce me any references for your answer to this question? I need it.
Dear Aram (Aram Mahmoodi),
OK, "voilà", take five
references[1-5], substantially, supporting your side, for your responding to referees' comments.
Compare VCs versus:
1)slow driving charge-discharge curves, having (quasi-)plateau(s) and
2)fast driving charge-discharge curves, without any plateau(s).
Note: If you search, then you will find, many, more.
1. Fig.3a vs. Fig.4c: https://www.researchgate.net/publication/317193198_O_2_2-_O_-_Functionalized_Oxygen-deficient_Co_3_O_4_Nanorods_as_High_Performance_Supercapacitor_Electrodes_and_Electrocatalysts_towards_Water_Splitting
2. Fig.6 vs. Fig.7: https://ars.els-cdn.com/content/image/1-s2.0-S0022369719316439-gr7.sml , in Supercapacitor and OER activity of transition metal (Mo, Co, Cu) sulphides https://www.sciencedirect.com/science/article/abs/pii/S0022369719316439
3. Fig.4: https://ars.els-cdn.com/content/image/1-s2.0-S0013468617323630-gr4.sml , in Hierarchical CoMoO4 nanoneedle electrodes for advanced supercapacitors and electrocatalytic oxygen evolution https://www.sciencedirect.com/science/article/pii/S0013468617323630
4. Trifunctional of Phosphorus-Doped NiCo2O4 Nanowire Materials for Asymmetric Supercapacitor, Oxygen Evolution Reaction, and Hydrogen Evolution Reaction https://pubs.acs.org/doi/pdf/10.1021/acsami.9b13182
5. NiO-CNT composite for high performance supercapacitor electrode and oxygen evolution reaction https://www.sciencedirect.com/science/article/pii/S0013468618314427
Oh my GOD, thank you dear prof. Ioannis Samaras
It was kind of you. My problem has been solved. I'm really grateful to you.
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