Surface Potential of Polycrystalline Hematite in Aqueous Medium

Figure 4

Electrode potential of the nonporous polycrystalline hematite electrode as a function of pH of the solution in the presence of NaClO₄ (𝑐=10⁻³ mol dm⁻³). Titrations were performed under the ultrasound, using the ultrasound probe (220 W). Titration of acidic solution with NaOH (◊) and back titration of basic solution with HClO₄ (∆). Temperature: 25.0°C.