NO Adsorption on Ag/Pt(110)-(1×2) Bimetallic Surfaces: Unexpected Formation of Nitrite/nitrate Surface Species

NO adsorption on Ag/Pt(110)-(1×2) bimetallic surfaces at room temperature was inves-tigated by means of Auger electron spectroscopy, X-ray photoelectron spectroscopy and thermal desorption spectroscopy. An unexpected formation of nitrite/nitrate surface species on Ag/Pt(110)-(1×2) bimetallic surfaces is observed, then decompose at elevated tempera-tures to form N₂. However, such nitrite/nitrate surface species do not form on clean Pt(110) and Ag-Pt alloy surfaces upon NO exposure at room temperature. The formation of ni-trite/nitrate surface species on Ag/Pt(110)-(1×2) bimetallic surfaces is attributed to highreactivity of highly coordination-unsaturated Ag clusters and the synergetic effect between Ag clusters and Pt substrate.