Application of Spent Li-Ion Batteries Cathode in Methylene Blue Dye Discoloration

Figure 1

Potential versus pH for O₂ and H₂O₂ reduction in water [Haynes]. The dotted line (1.02 V) represents the limit potential for LiCoO₂ oxidation (delitiation) in water. It was considered that  atm, [H₂O₂] = 0.10 mol L⁻¹ (blue line), and [H₂O₂] = 0.01 mol L⁻¹ (red line).