Fig. 4: Illustration of the reaction pathway of WGSR at Pt/CeO2 interface. | Communications Materials

Fig. 4: Illustration of the reaction pathway of WGSR at Pt/CeO2 interface.

From: Tracking the dynamics of catalytic Pt/CeO2 active sites during water-gas-shift reaction

Fig. 4

To better visualize the dynamic surface under reaction conditions, the size of each atom is optimized, which does not reflect the real scale. Red: oxygen; yellow: cerium; white: hydrogen; dark blue: oxidized Pt (Ptδ+); light blue: metallic Pt (Pt0); gray: carbon; V: oxygen vacancy. a The initial structure of active site (Ptδ+ – O – Ce4+ with the presence of OH groups) at Pt/CeO2 interface after O2-H2 pretreatment. b CO reacts with surface OH groups to form oxygen vacancy and metallic Pt (Pt0 – Ov – Ce3+). c Dissociation of water on the oxygen vacancy site and formation of CO2 and H2 products.

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