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. 2022 Mar 29;119(14):e2114639119. doi: 10.1073/pnas.2114639119

Fig. 2.

Fig. 2.

Scheme of Pt1@CeO2 and single-molecule nanocatalysis. (A) Scheme to show that the number of Pt atoms on a single CeO2 nanocrystal is one or zero for Pt1@CeO2 with Pt loading of 0.1 ppm. (B) Experimental optical setup for TIRF microscopy and the single-molecule nanocatalysis in a microflow cell based on the reduction reaction of resazurin by H2 to produce resorufin catalyzed by atomically dispersed Pt1@CeO2. (C) Typical fluorescence intensity turnover trajectory of a single atomically dispersed Pt1@CeO2 in H2-saturated resazurin (10 nM) solution at 100-ms time resolution.