We used graphite powder, sulfuric acid, potassium persulfate, phosphorus pentoxide, potassium permanganate, hydrogen peroxide, hydrogen chloride, and D$.$I waterf to mix impurities well through a centrifuge. After adding hydrazine, centrifugation was performed using pH paper until it reached $6$ or higher, and after centrifugation, rGO was dried in an environment of $40\backslash$deg C$.$ Then, we made a slurry, cast the slurry, and dried it afterwards. I made a coin cell with what I got here, and write a detailed consideration or review that I can get here

For example, ~~~Some books say how it is$,$ and I think this is why the result came out. Graphs measured by rgo: $15$ mv$,5$ mv$,10$ mv$,20$ mv