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Fig. 3. (a) XRD pattern of Pt-MnNC. (b) N2 adsorption-desorption isotherms and (c) corresponding pore size distribution curves of MnNC and Pt-MnNC. (d) N 1s XPS spectrum of Pt-MnNC. (e) Pt 4f XPS spectra of Pt-MnNC and commercial Pt/C catalyst. (f) Pt L3-edge XANES spectra, (g) Pt L3-edge FT-EXAFS spectra, and (h) Pt L3-edge k3-weighted wavelet diagrams of Pt-MnNC, Pt foil, and PtO2.