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. 2016 Aug 23;146(10):1867–1874. doi: 10.1007/s10562-016-1824-4

Fig. 2.

Fig. 2

Hydrogen oxidation on µm-sized domains of a polycrystalline Rh foil: a PEEM image of the same field of view as shown in Fig. 1a, but taken during the propagation of the reaction front accompanying the kinetic transition τA in b from the low catalytic activity state (“dark” surface) to the high activity state (“bright” surface); b hysteresis-like curve of the local PEEM intensity recorded during the cyclic variation of the hydrogen pressure at constant temperature of 493 K and an oxygen pressure of 7.7 × 10−7 mbar, τA and τB mark the kinetic transitions between the steady states of low and high catalytic activity. The ROI for which the PEEM intensity was registered, is marked in (a); c τA and τB values for different temperatures in the range of 433–493 K and constant oxygen pressure of 7.7 × 10−7 mbar, plotted in the p H2 vs 1/T coordinates (kinetic phase diagram). Regions of high and low catalytic activity and of bistability are marked