Catalysis in Frequency Space : Resolving Hidden Oscillating Minority Phases and Their Catalytic Properties
In situ catalysis studies typically correlate catalytic function and majority surface structures, but neglect that difficult-to-detect minority structures might govern catalysis. Here we use an oscillating CO:O2 gas composition to drive structural oscillations on a catalytically active Pd(100) surface and collect X-ray photoelectron spectroscopy data at high measurement frequency to demonstrate th