I want to calaculate the specific capacitance of PANI by Galvanostatic charging discharging method at current density, say, 0.5A/g-1. In three electrode setup, working electrode is PANI film, counter electrode is platinum sheet and Ag/AgCl is reference electrode.
The mass of the synthesized film is 16 mg. For Galvanostatic Charging-Discharging at constant density of 0.5 A/g-1, the value of the current (x) should be
x(A)/16×10-3 = 0.5Ag-1 or x= 0.5×16×10-3 or x = 0.008A
I open “cyclic charge discharge” in PWR800 Electrochemical Energy Software package. Software open the following windows. I am doing this first time, so please suggest me how fill the following values:
Cyclic Charge Discharge- Page 1 of 2
· Cell type = half cell
· Working connection = positive
· Capacity = ??
· First step = charge
· IR Measure = off
· Loop End 1 = Discharge Time
Dear,
To start galvanostatic charge discharge (GCD) you should first look at CV results. The current response at the lowest sweep rate, potential window can be evaluated from CV. To get maximum capacity from the system the selection of current values in GCD is always a crucial step. In three electrodes setup, your will click 'half cell', working connection depends on the electrode type (anode/cathode) particularly in battery electrodes. But for symmetrical supercapacitor you may either select positive or negative. Capacity tab can be left as default or you may insert the theoretical capacity of you electrode. You may click IR to compensate potential drop by applying positive feedback compensation mode. If you electrolyte conductivity is very high then no need for this. For more details please consult the application notes on Gamry website.
For 'Loop end' you may give enough time to get complete charge and discharge. This directly depends on the specific capacity of the system. So give extra time let's say 6hrs. If you want EIS after each charge and/or discharge then you may click either tab and insert logical parameters in the next window for EIS. Also get valuable guidancefrom Dr. Jacob. He is expert in this area. I just shared my personal experience.
Hi, and sorry but this site is really not the best place for this type of question. This is something best addressed by technical support, and Dan or myself would be happy to help, so please call or email us.
That said: many of those parameters/settings are things you need to know: are you measuring a half cell or a full cell? What is the capacity of your cell? What types of responses could you get that you would want the experiment terminated early (temperature too high, charge/discharge too short...)? Do you want EIS measured throughout the experiment?
The help within the software also has details/explanations about every parameter in the various setup windows.
Dear,
To start galvanostatic charge discharge (GCD) you should first look at CV results. The current response at the lowest sweep rate, potential window can be evaluated from CV. To get maximum capacity from the system the selection of current values in GCD is always a crucial step. In three electrodes setup, your will click 'half cell', working connection depends on the electrode type (anode/cathode) particularly in battery electrodes. But for symmetrical supercapacitor you may either select positive or negative. Capacity tab can be left as default or you may insert the theoretical capacity of you electrode. You may click IR to compensate potential drop by applying positive feedback compensation mode. If you electrolyte conductivity is very high then no need for this. For more details please consult the application notes on Gamry website.
For 'Loop end' you may give enough time to get complete charge and discharge. This directly depends on the specific capacity of the system. So give extra time let's say 6hrs. If you want EIS after each charge and/or discharge then you may click either tab and insert logical parameters in the next window for EIS. Also get valuable guidancefrom Dr. Jacob. He is expert in this area. I just shared my personal experience.
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