Fig. 1: Dynamic phase diagram.
From: In situ observation of oscillatory redox dynamics of copper
a–c SEM images showing different surface states corresponding to, respectively, regimes A, B and C of the phase diagram presented in d. In regime A, the reductant dominates and the catalyst remains in the metallic state. Some grains show oxygen induced reconstruction. In regime B, the counteracting oxidizing and reducing agents induce dynamic interconversion between simultaneously present oxidized and reduced domains. In regime C, the oxidant dominates and copper is oxidized. The scale bar measures 5 μm. The measurements used to generate the phase diagram are indicated by circles and were performed in the pressure range between 20 and 50 Pa.
