Why does the potential window in Galvanostatic Charge Discharge (GCD) become shorter when compared to Cycling Voltammetry (CV)?
The voltage window for CV in my research problem is 0-0.6 V, however, for GCD it is 0-0.4 V.
Dear Shruti Deshpande ,
it might be some kinetic issue(s), due to low conductivity of your WE-material (class) electrode.
Try, please, some lower value(s) of current in your next GCD(s), also.
Dear Shruti Deshpande, I just wanted to ask, how many CV and GCD cycles you have run for the optimization of the potential window.
Hello, Arun Kumar
I need to run CV at various scan rates ranging from 5mV to 100mV for 2-3 cycles. and GCD for about 2-3 cycles at various current densities ranging from 1 Ag-1 to 10 Ag-1.
Before performing CV and GCD, I have to run 50 cycles of CV at a 50mV scan rate to activate the working electrode. I used material-deposited nickel foam for the working electrode.
Dear Shruti Deshpande, A scan rate of 50 mV/sec is very high for activating the working electrode (WE). I recommend starting with cyclic voltammetry (CV) to fine-tune the potential window. Try adjusting the potential range at lower scan rates, such as 1 or 5 mV/sec, for around 30-40 cycles. Subsequently, for your galvanostatic charge-discharge (GCD) experiment, employ the same potential ranges but at lower current densities, such as 0.5 A/g. I anticipate that this approach will yield improved outcomes. Best of luck with your experimentation!
@ Arun Kumar Thank you sir for your answer, however, Could you maybe elaborate on why we need to run a low scan rate of CV for GCD potential reach? Is it required to reach the GCD potential window as well as the CV potential window? Also, the amount of material deposited on the working electrode influences the current density. We give a value in current density as the basis for the weight of the deposited material on the working electrode. Then how does low current density show accurate charging-discharging capacity?
- Badges
- Science topic
- Similar topics
- Engineering
- Electrical Engineering
- Electrodes