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X-ray diffraction (XRD) patterns (a), ultraviolet–visible light (UV–Vis) diffuse reflectance spectra (DRS) (b), and photoluminescence spectra (c) of prepared photocatalysts. Photocurrent transient response (d) and electrochemical impedance spectroscopy (EIS) Nyquist plots (inset) of the sample electrodes of TiO2, N–TiO2, Au2Pt2/TiO2, Au2Pt2/N–TiO2 under visible-light irradiation.
