fig2

Figure 2. (A and B) TEM images and (C) HR-TEM image of STG-PtCo/EC. (D) HAADF-STEM image and EDS mapping images of STG-PtCo/EC. (E) Particle size distribution of the prepared electrocatalysts. (F) Thickness of the carbon encapsulation layer on the prepared electrocatalysts. (G) Raman spectra and (H) EPR spectra of the as-synthesized electrocatalysts. XPS spectra of (I) Pt 4f and (J) Co 2p for the additive-assisted and additivefree H₂PtCl₆-CoCl₂/EC precursor powders.