Operando XAS combined with DFT calculations allows us to draw a phase diagram of the surface chemical state as a function of applied potential, showing hydroxyl filling process and potential-dependent deprotonation process.
Operando X-ray absorption spectroscopy (XAS) technique unravels that the CoFe nanoparticles in a new type of lanthana-anchored CoFe catalyst are nearly transformed into unique (Co/Fe)O(OH) under the electrochemical condition, as real active species for oxygen evolution reaction.
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