Fig. 3: Restructuring of a truncated Pd nanocube during an oscillatory CO oxidation reaction.

a Plots of the measured temperature, heater power, and b the corresponding amounts of the CO, O₂, and CO₂ gases during the oscillatory CO oxidation reaction at 420 °C and \({p}_{{{{{{\rm{CO}}}}}}}/{p}_{{{{{{{\rm{O}}}}}}}_{2}}\approx 0.5\). The arrows in b correspond to the timepoints of the image series shown in d, e. c STEM image and the schematic of a truncated nanocube. d In situ TEM image series of a truncated nanocube in low- and high-activity states during the oscillation. e High-resolution image series of the NP’s corner, as indicated by the yellow box in d. During the reaction, the corners of the truncated nanocube restructure between the round (at 204 s) and flat (at 102 and 326 s) facets (Supplementary Movie 2; see Supplementary Fig. 10 for the details of the rest of oscillation during 500 s < t < 700 s).