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12 votes
Accepted

Cyclic Voltammetry - HOMO and LUMO levels

Yes, you can "convert" this way, but you're correct to be skeptical. Let's start with interpreting the cyclic voltammetry curves themselves. (figure from Wikipedia) Note that the "peak" actually ...
Geoff Hutchison's user avatar
4 votes

Decreasing magnitude of peaks in cyclic voltammogram?

Perhaps your observation is an indication of irreversible reaction conditions. More specifically, a tight deposit on the electrodes hampering the advancement of the electrochemical reactions. This ...
Buttonwood's user avatar
  • 30.1k
3 votes

onset of oxidation for cyclic voltammetry

Please don't apply the reversible CV diagram on something which is clearly a non-classical cyclic voltammogram. When you experimentally don't get the shape as predicted by the theory, it means it that ...
AChem's user avatar
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2 votes

Voltammetry on homemade supercapacitor

Testing capacitors is almost always done with a two electrode setup. There are some details here about interpreting the data, but the experimental setup is that you just connect the counter and ...
Michael DM Dryden's user avatar
2 votes

What does onset of oxidation mean in Cyclic volammetry

The concept is explained very nicely here Cyclic voltammetry. I would say the term onset of oxidation is slightly vague but one should talk about $E_{onset}$ as shown in the figure. Qualitatively, the ...
AChem's user avatar
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2 votes
Accepted

Different solutions in cyclic voltammetry

Recording a CV assess both so-called half cell reactions. If balanced individually, some of them only need only the transfer of an electron, e.g. for $$\ce{Fe^{2+} -> Fe^{3+} + e-}$$ Other half-...
Buttonwood's user avatar
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2 votes

Why doesn't fast-scan cyclic voltammetry work with metal electrodes?

It actually does work. Carbon fiber electrodes are just more useful for the neuro work that fast scans are popular for these days. Here is an example from the literature of a metal electrode used up ...
Burak Ulgut's user avatar
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1 vote

How to run electrochemical tests on Microorganism (bacteria in a medium)?

Your reference electrode contains chlorine and silver, the ions from these elements can kill bacteria, you should avoid liberating gases too: oxygen is killing anaerobic bacteria. To avoid using ...
jpflab's user avatar
  • 11
1 vote
Accepted

How to run electrochemical tests on Microorganism (bacteria in a medium)?

From what I understand, your main issue is connecting a solution in an electrical circuit without changing the composition of the solution due to electrochemical redox reactions. So, there are two ...
Raghavendra Singh's user avatar
1 vote

clarification on background limits in electrochemistry

the background limits ‘are the potentials where the cathodic and anodic currents start to flow at a working electrode when it is immersed in a solution containing only an electrolyte added to decrease ...
AChem's user avatar
  • 40.9k
1 vote

Why is the peak-to-peak separation of cyclic voltammetry is 57 mV?

The derivation of equation for cyclic voltammetry requires a lot of advanced calculus and differential equations based on the Fick's law of diffusion. This is not to discourage you but to show that ...
AChem's user avatar
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1 vote

Some materials emit more photoelectrons than others - why?

Based on photoelectric effect, the amount of photons emitted is dependent on the intensity of the incident radiation. All factors that would emit for photoelectrons include; Energy of light and ...
ClearlyConfused's user avatar
1 vote

Why the current of double layer charging is independent of potential?

Wow thats a really old question but here is the answer: for electrochemical systems, C is a constant and I=C*(dV/dt) and dV/dt is the scan rate which scales the potential linearly (so is also constant)...
Mäßige's user avatar
  • 217

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