fig1
Figure 1. Synthesis and morphology characterization of materials. (A) The synthesis procedure of CoOOH-FeD-CoV; (B) SEM image of CoOOH-FeD-CoV with different magnifications; (C) AFM image of CoOOH-FeD-CoV, along the the height profile measured along the indicated straight line; (D) HAADF-STEM image of CoOOH-FeD-CoV and the corresponding mappings for different elements (Co, Fe and W); (E-G) High resolution of HAADF-STEM images and intensity profiles depicting the presence of Fe (CoOOH-FeD and CoOOH-FeD-CoV) as well as the complete removal of W dopants in CoOOH-CoV. SEM: Scanning electron microscope; AFM: atomic force microscopy; HAADF-STEM: high-angle annular dark-field scanning transmission electron microscopy.
