The chronocoulometry(CC) mode in bio-logic is associated with Chronoamperometry(CA) mode. However, CA uses constant potential and CC uses sweep potential. How can I change the mode from CA to CC?
Dear Yan Jiang , chronocoulometry means that you measure the charge vs; time, so it is generally associated with chronoamperometry because there is a direct correlation between current and charge. Which experiment are you trying to perform ? A voltammetry with a limit in the charge ? Best regards, Nicolas
Nicolas Murer
Hi Nicolas, thanks for you informative guidance.
The experiment I am trying to do is Q vs t at the potential from -0.2 V to 0.5 V. However, the settings in the biologic is that I can only change current instead change Initial and Final potential.
I attached the similar experiment plot. Please check it.
Dear Jiang Yan, the experiment you show is just a potential step, during which you measure the current. As you know, Q = It, so if you have current and time you have the charge. In EC-Lab you can choose to plot the results as Ewe vs. time or I vs. time and also Q vs. time.
If you choose a sequence of two chronoamperometry, you can perform your experiment: one chronoamperometry at -0.2 V during a given time and another at 0.5 V during a different given time. I enclosed a settings file for your perusal. Best regards, Nicolas
You impose the range of current and select the periode of time of each experiment, then ypu will have the straights lines of charge quantity Q.
Nicolas Murer, Naima Ghemmit-Doulache
Thank your advice. I will try them. At the same time, I would like to highlight Chronocoulometry involves measurement of the charge vs. time response to an applied potential step waveform in a short. It sounds your recommendations can work!
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