Hello all!
I want to measure galvanostatic charge/discharge responce of my flow battery system with 2 or 3 electrode. I used organic compound as an electroactive material. I could not be sure about how much current I should apply to my system. Any suggestion will be appreciated.
What kind of rate do you want to use? 1C, 0.5C, 0.25C, etc...? What is the estimated capacity of your battery? What is the voltage range you expect to operate in? This is what I did when I wasn't sure.
Do a CV scan in the range you want to charge/discharge in at some rate which is equivalent to the expected C rate. What I mean is, lets say you want to charge/discharge at a 1C rate, so fully charge in an hour and fully discharge in an hour. If your voltage window is 1V, take 1V/3600s and make your CV rate 1/3600 V/s or 1/3.6 mV/s. Once your CV finishes integrate the charge from your starting potential to the upper voltage limit, and divide by the time it took to go from the starting voltage to the upper limit (in this case about 3600s). That should give you a rough idea of what rate to use for your galvanostatic measurement.
Thank you for your valuable comments Brian Kitchen and Netzahualcóyotl Arroyo Currás
I'm going to use cadmium or nickel in anode.The potential of them in sulfuric acid is approximately -0.2 V
and I'm going to use an organic compound in cathode.Its potential in sulfuric acid is approximately +0.5 V
the estimated capacity of my battery is approximately 300 mAh/g.
this compound is expensive then i use a dilute solution of about 2 to 3 mmol/litr.
I just tested the battery on lab scale.
Please advise with regard to the conditions listed
Thank you for your valuable comments Netzahualcóyotl Arroyo Currás.
I will try your instructions.
I will report the result to the next few days.
Thank you for your kindness.
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