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Schematic of Pt/TiO2-Ov design and characterization. (a) Diagram of preparation process of Pt/TiO2-Ov; (b) XRD spectra of Pt/TiO2-Ov and TiO2-Ov; (c) SEM image and (d) N2 adsorption/ desorption isotherm of TiO2 etched in 0.5% HF; (e, f) TEM of Pt/TiO2-Ov; (g) HR-TEM images of Pt/TiO2-Ov; (h) HAADF-STEM image of Pt/TiO2-Ov; (i–m) elemental mapping images of Ti, Pt, O, Si of Pt/TiO2-Ov.

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