Hi, I'm doing electrochemical reaction for the intercalation but i just found out that at some high voltages, solvent turns into black , especially for the solvent around the electrode. It looks like some black power gets dissolved into the solution. I used TPAB mixed with NMP solution. I guess it's not a melt rubber from electrode clipper... Is there anyone who know where this black color comes from?
At high voltage, the energy input is substantial and the N-Methyl-2-pyrrolidone (NMP) is clearly being either de-oxygenated or de-carbonised, thereby generating a deposit of black free carbon molecules.
Please look at the following below links which may help you in your analysis:
https://learning-center.homesciencetools.com/article/color-change-chemistry/
Thanks
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