Absurdly high currents in CV
I am trying to get my Rodeostat to work as I would like it to. Results are however very different from what I expect them to be.
First of all, running tests seem to damage the electrode (starts bubbling + silver reference on screen printed electrode starts to become grey). I read that this might result from a high current in the beginning and I might be able to fix that using shift to 0, but I wonder why this is not happening on other potentiostats and if that really explains what I am observing (considering that there should not be any significant current on the reference electrode),
Also, the currents that I get do not make any sense when I compare them with the results I get from running a test on an Autolab PGstat204.
I would be happy to hear if someone has encountered similiar issues and can tell me what to do about it!
Thanks a lot!
Dropsens C110 electrodes
I'm wondering if it is possible that the CE and RE are being swapped? This could happen if the card orientation is not correct. Could you upload an image or two of your setup including an image card inserted into the electrode adapter?
Thank you so much,
that did the trick. I feel incredibly stupid now.
What I realized now is that my CVs are kinda "shaky", like in the one at a sample rate of 10 that you can see here. I figured that i might have to reduce the rate, but that didn't really make it better. Any ideas on how to make the signal less noisy?
You should get the best current measurement by selecting the smallest current range which will encompass your data.
In this case the sample rate just determines the rate at which samples are collected and sent to the host PC i.e. the time step between samples. So the scan rate (V/s) is independent from the sample rate. The scan rate is set via the 'amplitude' and the 'period' parameters as follows scan rate = 4 x amplitude/period.
You might be able to reduce the noise by taking advantage of signal averaging. You could do this by sampling at a higher rate (while maintaining the same scan rate) and then lowpass filtering the data. For example you could collect data sampling at 100 - 200Hz. And then after collecting the data lowpass filter the data to reduce the noise - maybe using a zero-phase forward-backward such as filtfilt