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Questions tagged [cyclic-voltammetry]

Cyclic voltammetry or CV is a type of potentiodynamic electrochemical measurement. In a cyclic voltammetry experiment, the working electrode potential is ramped linearly versus time.

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what should be the onset potential using cyclic voltammetry?

I am working for PEM fuel cell cathode material. I am confused regarding the onset potential determination for my catalyst (CV attached, fig 1 is complete CV while fig 2 is its zoom image for clear ...
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How does cyclic voltammetry in a electrolytic cell measure the precise oxidation potential?

From what I understand, the potential necessary to induce a current to flow in an electrolytic cell depends on both reduction potentials of the anode and cathode reactions, where E(cell) is comprised ...
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Electron transfer rate equation for Electrodeposition

$$k=\cfrac{mnFv}{RT}$$ where $n$ is the electron transfer number (in my case, 1), $F$ is Faraday's constant, $v$ is my scan rate ($0.1 ~ \mathrm{V/s}$), $R$ is my gas constant, and finally ... $m$! ...
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What are the factors that affect the redox reactions?

In my work, I used $\ce{Co(OH)2}$ and $\ce{Ni(OH)2}$ as an active materials to fabricate as symmetric supercapacitors in which I used 1-butyl-1-methylpyrrolidinium dicyanamide as an electrolyte. From ...
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capacitive contribution voltammetry

I am working with a sheet of zinc metal where there is an oxide film on it (ZnO) in passivation conditions (pH=10). I have done voltammetry measurements for different scan rates with a 3 electrodes ...
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Some materials emit more photoelectrons than others - why?

Again, I'm a physicist turning to chemists (so bear with me). So I've been measuring some materials by changing the wavelength of the incident light on the material and I have a detecting tip like in ...
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Why doesn't fast-scan cyclic voltammetry work with metal electrodes?

Every paper I've seen discussing it uses it with carbon nanofiber or some other carbon material like a diamond. If the physical principles by which it works are based on sweeping through voltages, I ...
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Decreasing magnitude of peaks in cyclic voltammogram?

I'm in an instrumentation course and we covered cyclic voltammetry earlier in the semester and will be doing an experiment in CV next week. My question is this: If you have a reaction and sweep the ...
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Cyclic Voltammetry - HOMO and LUMO levels

I'm a physicist, so I apologize if these are obvious questions. I've carried out CV measurements on a few different types of material (with a ferrocene reference). I am interested in determining the ...
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Why the current of double layer charging is independent of potential?

i-V curve of double layer charging has a rectangular shape. Why when increasing or decreasing the voltage, the current remains constant? Or I can ask, how the double layer structure is changing by ...
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How could you distinguish between an irreversible electron transfer couple and a chemically irreversible couple using cyclic voltammetry?

What is the difference between an irreversible electron transfer couple and a chemically irreversible couple? How could you distinguish between these two processes using cyclic voltammetry?
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Voltammetry on homemade supercapacitor

I would like to get some voltammetry curves with my homemade supercapacitor in order to be sure that I have only capacitive effects (capacitive current) in my cell and no redox reactions (faradic ...
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The potential range of the cyclic voltammetry of CoCat in KPi made of D2O

I have a phosphate buffer adjusted to pH 7, and another phosphate buffer made of deuterium oxide (D2O) adjusted to pH 6.6 (pD 7). I want to conduct cyclic voltammetry of cobalt oxide catalyst in these ...
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Selecting a good test solution for Cyclic Voltammetry

So I have a textbook headed my way for this but need to get a head start. I have a 3-electrode voltammetry setup but I want to test it for some standard values (for educational purposes) before I ...
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Role of the counter/auxiliary electrode in cyclic voltammetry

I am doing a school project on cyclic voltammetry and am currently studying the topic. I have learnt that the reaction mostly takes place around the working electrode where the current is measured ...
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Why is the cyclic voltammetry of my ferrocene compound not showing a standard shape?

I am trying to set-up a new cyclic voltammetry measurement station in my lab but the results are very poor. I am using the following parameters: ...
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Will oxidation/reduction of copper still occur in an electrochemical cell if it is not in an aqueous environment?

Notation of the reduction and oxidation of copper typically includes the aqueous state. Illustrated below: $$\ce{Cu(s) -> Cu^2+(aq) + 2e-}$$ This event usually occurs at 0.34 V. What if the copper ...
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How do I write many cyclic voltammetry curves in Nova?

We are making an electrochemical research on supercapacitors that involves checking stability of our material. That requires repeated writing of cyclic voltammetry curves. Our goal is to write at ...
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Why is current non-zero when applied potential is still below E$^0$ in cyclic voltammetry?

In this diagram (Evans et al., J. Chem. Edu.) the current is non-zero, but the potential is still below the normal potential. How can the compound become oxidized at the working electrode, when the ...
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How to find the band gap for a compound?

I have processed a si/polymer hybrid using a silane coupling agent which I need to determine the energy gap / band gap. Would you please let me know the procedure to go about determining the band gap?...