I'm using Gamry instrument interface 1000 and it obviously only state current
I've tried to calculate the current density (A/g) by simply current divided by the mass of electrode (without includeing nickel foam)
when i looked at all of my GCD analysis trials for i have 3 trials at 0.005A
all of my trials do not have the same current density value
is my formula was wrong or my concept was not accurate?
might be each time your materials behave differently, then, definitely, your current density will be different.
When you have your GCD (Galvanostatic chrage-discharge), it means you have a fixed current on the sample, i.e. you apply a fixed current on it. To have this current normalized, people choose to divide the value of current on the area of electrode, or divide the the current by the ACTIVE mass of electrode. Then you will have the potential with time. Check if you are using galvanostatic mode (chronopotentiometry), if not, please check your instrument with a dummy cell which coming with the instrument or with a standrad experiment done by any author before running yours. I hope this help.
For current density calculation in GCD analysis, the reference value depends upon the charactristics of material. For current normalization, try to use average mass (excluding mass of nickle foam, mass of binder and mass of conductive agent). It may occur due to callibration issues, so you should check them too. Thank you.
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