Hi,
What is the reason for decreasing the capacitance retention with respect to the number of cycles increased in the electrochemical super-capacitor studies?
I have performed the cycling stability performance of the metal oxide based electrode (3000 cycles) and I got around 85 % of capacitance retention. Some cases the capacitance retention is decreasing or increasing but here my doubt is when the cycle number is increasing (after 3000 cycles) the capacitance retention or stability was decreasing..... Why..?
Thank you in advance...!
When you perform cyclic test of super capacitor...actually you are performing forced redox reactions.....ideally if reactions are fully reversing then there should not be any drop....but there are factors affecting on reactions and surface stability of electrods ...hence with cycle, the device is not coming back to initial stage ....that will lead to decrease in performance.
Aside of redox reactions that would bring about composition destruction resulting from irreversible chemical reaction, the intercalation/deintercalation of electrolyte ions upon charge-discharge cycles to counterbalance the overall charge, will also introduce mechanical stress to physical structure of electrode material. A repeated charge-discharge process will definitely lead to mechanical and electrical faults that diminishing the initial performance attributed to the loss of mass of active material.
Dear Lim Pei Teng,
Thanks for your valuable answer on my question.
Thank you.
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