Influence of the Potential on the Charge-Transfer Rate Constant of Photooxidation of Water over <em>&alpha;</em>-Fe₂O₃ and Ti-Doped <em>&alpha;</em>-Fe₂O₃

Quantitative Determination the Role of the Intrabandgap States in Water Photooxidation over Hematite Electrodes

“…As for the determination of k ct , it can be obtained from the angular frequency of the maximum imaginary component (ω max 1 ) of the second arc of Nyquist plots for EIS responses (Figure a,b and Figure S9) by a mathematical fitting ,,, (for details of the ω max 1 derivation see Supporting Information Section 2). The results of ω max 1 at different applied potential in 1 M NaOH at 100 mW cm –2 are presented in Figure c, whose values are verified by the experimentally recorded maximum angular frequency in the Nyquist plots as listed in Table S2.…”

“…As for the determination of k ct , it can be obtained from the angular frequency of the maximum imaginary component (ω max 1 ) of the second arc of Nyquist plots for EIS responses (Figure 3a,b and Figure S9) by a mathematical fitting 19,25,26,30 (for details of the ω max values are verified by the experimentally recorded maximum angular frequency in the Nyquist plots as listed in Table S2. As shown in Figure 3c, the k ct increases with the applied potential, implying that there is a potential drop across the Helmholtz layer (φ H ).…”