fig4
![Applications of <i>in situ</i> electron microscopy in oxygen electrocatalysis](https://image.oaes.cc/6a894aee-bef2-4c0f-be41-3155aa90e967/4529.fig.4.jpg)
Figure 4. IL-STEM and corresponding elemental mapping images of Pt/TiWC before (upper panel) and after (bottom panel) the durability test. The white and orange arrows indicate particles with complete and incomplete Pt shells, respectively. Scale bars: (A) 5 nm and (B) 4 nm. (C) First CV curve at 2 mV/s in 0.1 M HClO4 (upper panel) and the corresponding dissolution concentration (C) profiles of W (middle panel) and Pt (bottom panel) as a function of the applied potential[63]. IL-STEM: Identical location scanning transmission electron microscopy.