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Cyclic Voltammetry
Posted 3 mars 2016, 01:22 UTC−5 Battery Design, Results & Visualization Version 5.0, Version 5.1, Version 5.2 1 Reply
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Dear All,
I am working on cyclic voltammetry on a 3-d model based on the 2-D model in the model exchange forum(www.comsol.co.in/community/exchange/203/). at lower scan rates I get the graph shown below (100mV/s) which shows certain anomaly while the voltage is increasing and at higher scan rates I get a spike at the beginning of the graph.
Can anyone please explain it to me what may be the reason that this is happening and help me with it.
Thank You
I am working on cyclic voltammetry on a 3-d model based on the 2-D model in the model exchange forum(www.comsol.co.in/community/exchange/203/). at lower scan rates I get the graph shown below (100mV/s) which shows certain anomaly while the voltage is increasing and at higher scan rates I get a spike at the beginning of the graph.
Can anyone please explain it to me what may be the reason that this is happening and help me with it.
Thank You
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1 Reply Last Post 3 mars 2016, 04:25 UTC−5
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Posted:
9 years ago
Hi
You get the initial spike because the initial concentrations of the redox couple are
[Ox] = C_bulk*TH/(1 + TH)
[Red] = C_bulk/(1 + TH)
where TH = exp[nF/RT(E_i - E °')] and E_i = initial potential of the scan; C_bulk is the concentration of your electrolyte.
I got the same pattern before I changed the initial concentrations like that.
BR
Lasse
You get the initial spike because the initial concentrations of the redox couple are
[Ox] = C_bulk*TH/(1 + TH)
[Red] = C_bulk/(1 + TH)
where TH = exp[nF/RT(E_i - E °')] and E_i = initial potential of the scan; C_bulk is the concentration of your electrolyte.
I got the same pattern before I changed the initial concentrations like that.
BR
Lasse