Figure 2

Microscopic and compositional observations of a single Pt monolayer on a Ru/C nanoparticle electrocatalyst.
(a) HRTEM image of Ru/C; (b and c) HRTEM images of Ru@Pt/C; (d) HAADF-STEM image of Ru@Pt/C; (e) Ru@Pt/C nanoparticle chosen for EELS and ADF scanning analyses and the scanning track line; (f) the Pt+Ru signal profile obtained from simultaneous ADF and the Ru profile provided by STEM-EELS scanning analysis of Ru alone.