Fig. 1: Characterizations of multiple active sites in the Pt-Fe-N-C electrocatalyst. | Nature Catalysis

Fig. 1: Characterizations of multiple active sites in the Pt-Fe-N-C electrocatalyst.

From: Atomically dispersed Pt and Fe sites and Pt–Fe nanoparticles for durable proton exchange membrane fuel cells

Fig. 1

a,b, TEM image (a) and HAADF-STEM image (b) of the hybrid Pt-Fe-N-C catalyst. c, HAADF-STEM image of an individual small nanoparticle with a simulated STEM image and atomic models along the [100] zone axis (white and yellow spheres represent Pt and Fe, respectively). d,e, HAADF-STEM image (d) and corresponding EELS analysis (e) to verify the coexistence of Pt and Fe at the atomic level in the Pt-Fe-N-C electrocatalyst (the spots in the blue and red dashed circles are ascribed to the Fe and Pt single atoms, respectively). f,g, Comparisons of the X-ray absorption near-edge structure spectra of Pt-Fe-N-C, Fe–N–C, Fe foil, FeO, Fe2O3 and Pt foil: Pt L3 edge (f) and Fe K edge (g). a.u., arbitrary units; sim, simulation.

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