fig1

Figure 1. (A) Diagram of the preparation process of Pt-WOx-MOF-74(Co); (B-D) TEM pictures of Pt-WOx, Pt-MOF-74(Co) and Pt-WOx-MOF-74(Co); (E and F) HAADF-STEM images from the [110] projection of Pt-MOF-74(Co) and Pt-WOx-MOF-74(Co); (G) HAADF-STEM image of Pt-WOx; (H-J) EDS elemental mappings of Pt-WOx, Pt-MOF-74(Co) and Pt-WOx-MOF-74(Co). MOF: Metal-organic framework; TEM: transmission electron microscopy; HAADF-STEM: high-angle annular dark field scanning TEM; EDS: energy-dispersive X-ray spectroscopy.