Nov 01, 2020 · Planetary ball mill Retsch PM100 was operated at 300 rpm. Vessel for the ball milling was a stainless-steel jar of 50 mL volume. 4.00 g of graphite powder Gr (Alfa Aesar, 99%) was mixed with 6.04 g of potassium perchlorate KClO 4 (Fisher Scientific 99%) and 20.0 mL of deionized water (DI). Powder to balls ratio was 1:20