Observation of *N2H3 Intermediates by In Situ Electrochemical SERS: New Pathway of Ammonia Oxidation on High-Durability PtIr Catalysts

without the formation of toxic byproducts. Therefore, PtIr alloy catalysts exhibit significantly enhanced durability compared to monometallic Pt catalysts. This work highlights the paramount importance of directly observing key reaction intermediates via in situ spectroscopy for elucidating catalytic mechanisms.