Fig. 1
From: In situ spectroscopy-guided engineering of rhodium single-atom catalysts for CO oxidation
Course of the operando experiments and correlating operando spectra. a Operando XAS experiments at the Rh K-edge under different atmospheres and reaction temperatures: (black squares) air; (red circles) 5% CO/He; (blue triangles) 7% O2/He; (green down-pointing triangles) 2.9% CO/2.9% O2/He. b Proposed catalyst structure before exposure to CO with one oxygen molecule bound to Rh. Atom colors: W (gray), O (red), C (black), Rh (blue). Rh K-edge spectra under c CO, d O2, and e O2/CO at increasing temperatures (from bottom to top). The dashed lines are highlighting the pre-edge feature and have no physical meaning
