Going beyond atom visualization—Characterization of supported two-atom single-cluster catalysts with scanning transmission electron microscopy

As an innovative development of single-atom catalysts (SACs), single-cluster (SCCs) such as dual-atom have attracted considerable interest due to their excellent performance in catalysis. one the most powerful and visualizable tools, scanning transmission electron microscopy (STEM) has been widely applied characterization SCCs. Herein, nitrogen-doped carbon-supported FeFe CoFe, two representative examples homonuclear heteronuclear SCCs, are characterized by STEM. Furthermore, image processing program is developed analyze STEM images obtain locations atoms, well projected distances between atoms possible pairs. The dimer both CoFe exhibit a trimodal distribution, which can correspond energy-favorable atomic structures theoretical simulations. Our work offers avenue for directly revealing configurations sites SCCs via big data statistics strong