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. 2021 Nov 11;12:6517. doi: 10.1038/s41467-021-26855-y

Fig. 3. Coexisting multistates in catalytic H2 oxidation on Rh.

Fig. 3

a Rh 3d5/2 SPEM map of 2/3 (red) and 1/4 (blue) oxygen-bound Rh states of regions 2 and 3 in Fig. 1a during H2 oxidation at T = 453 K, pO2 = 1.1 × 10−6 mbar, pH2 = 1.2 × 10−6 mbar; b reference Rh 3d5/2 XPS spectra for the catalytically active and inactive steady states on Rh(13 9 1) at T = 453 K, pO2 = 1.1 × 10−6 mbar, pH2 = 1.6 × 10−6 and 0.9 × 10−6 mbar, respectively. The XPS signal intensity in the energy window 306–307.25 eV is colour-coded; c atomic ball model of the Rh(18 1 1) surface and colour-coded spectral time series in the multi-state regime. The colour-coded active steady state reference spectrum from (b) is shown on the right hand side; d the same as in (c) but for the Rh(11 11 7) surface, with a reference spectrum of the inactive steady state on the left-hand side; e the same as in (c) but for the Rh(15 8 2) surface, with two reference spectra on both sides; f the same as in (e) but for Rh(13 9 1).