My material mainly has V2O5 RGO ratio of about 85:15 electrode 8.1.1 material carbon black PTFE electrolyte with NACL CV scanning range -0.1~0.8 But as shown in my picture, I can't charge it.
You are using NaCl as the electrolyte? Try NaClO4.
What is the y-axis in the first picture?
Try EIS to find impedance first, if it is too high then there is something wrong with your cell setup.
thank you for your reply Mr. Zachary Neale. The y-axis in first picture is about -0.1 voltage, yes I try using NaCl as my electrolyte.
Han-Ching,
Judging from the oval shaped CV curve, I can tell that your device is highly resistive and does not behave as a capacitor at all. The plateau of the GCD curve indicates some redox reactions happened which contributed a lot of "false" capacity. It is impossible to tell what the side reaction(s) is/are, but considering the quality of the device is poor, I suggest you re-assembling more devices to repeat the tests. If the problem still persists, you may want to test a commercial device or other normally functional materials developed in your lab to exclude the possible problems of your electrochemical workstation.
As Zachary pointed out, EIS is able to reveal which resistance (combined-series, charge-transfer and ion-diffusion) dominates the internal resistance of your device. But again the best solution I believe is to re-make devices to repeat the tests.
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