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Figure 3. Photoelectrochemical properties and reactive oxygen species characterization of pristine BiFeO₃ and BiFe(Pt)O₃ photocatalysts: (A) TRPL decay spectra; (B) EIS Nyquist plots; (C) Bode phase plots; (D) Transient photocurrent responses of pristine BiFeO₃, and BiFe(Pt)O₃ under light irradiation (L) with individual external field of magnetic field (M), electric polarization (P), or ultrasonic vibration (U); (E) Transient photocurrent responses of BiFe(Pt)O₃ under different multi-field-assisted conditions; (F) ESR spectra of DMPO–•OH for pristine BiFeO₃ and BiFe(Pt)O₃ under light irradiation; (G) ESR spectra of DMPO–•OH for BiFe(Pt)O₃ under different multi-field-assisted conditions; (H) ESR spectra of DMPO–•O₂^- for pristine BiFeO₃ and BiFe(Pt)O₃ under light irradiation; (I) ESR spectra of DMPO–•O₂^- for BiFe(Pt)O₃ under different multi-field-assisted conditions. TRPL: Time-resolved photoluminescence; EIS: electrochemical impedance spectroscopy; ESR: electron spin resonance; DMPO: 5,5-dimethyl-1-pyrroline N-oxide.