I am trying to run cyclic voltammetry experiments on a modified electrode. The literature shows distinct peaks for the analytes (pesticides, phenols) using glassy carbon electrode(GCE) as working electrode. I am able to get the peak signal on GCE but not on the modified electrode. What could be the possible reasons?
Hello Vikram,
try to use a supporting electrolyte or low the scan rate
according to my modest experience, I think that the strong probabilities are along two axes, be a problem of surface which is of the first deposition, probably an over saturation of your electrode during the filling, for a second probability can be a problem of concentration of electrolyte.
Thanks Salah Eddine Berrabah and Ahmed Malek Djaballah for your useful insights.
I am getting very high current levels of approximately 300 to 400 microA as against that reported in literature i.e. around 5 to 15 microA at 100 mV/s (see figure). I am using 0.1 M KCl as supporting electrolyte. There is a peak around +1 V that I am looking for, but not as distinct as in literature. What could be the possible reasons for such high current levels and lack of a distinct peak?
Dear Vikram Wanjari,
Try to select the potential window as per the literature. Since you want it at 1 V, try CV in the range of 0.5 to 1.2, run for at least 4-6 cycles, and see how the plot looks. You may get the result you intend to.
Since you are getting nearly 20 times more current that means you need to reduce the scan rate to either 5 mV/Sec or so.
hello Vikram,
there are multiple solutions to your problem
1/ try to perform a multiple cyclic voltammetry
2/ use KCL 1M
3/ reduce the scan rate and the potential window
Thanks Sai Prasad Nayak . Reducing the scan rate has worked, I am able to get the desired peak. Thanks Salah Eddine Berrabah , I am trying to optimize the signals with the steps you all suggested. Thanks Ahmed Malek Djaballah for your suggestions as well. Will look into all these aspects.
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