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- W2078334080 abstract "The paper examines formation of a monolayer and submonolayers of Schem on Pt(111) electrodes accomplished through its immersion in aqueous Na2S solution. The Schem monolayer, having the (1×1) structure at θSchem=1, can be gradually removed by oxidative desorption at E≥0.95 V, RHE, and the Schem coverage can be precisely controlled. The Schem layer suppresses the HUPD and anion adsorption as well as it affects the oxide growth behavior on Pt(111). LEED data reveal that Schem forms well-defined structures on Pt(111) for 0.50≥θSchem≥0.25: c(2×2) at θSchem=1/2, (3×3)R30° at θSchem=1/3, and p(2×2) at θSchem=1/4; when θSchem≤0.20, structured islands of Schem are observed. AES and CEELS data indicate that the adsorbed S is not present in an oxidized state; it is almost of atomic character with an incomplete negative charge due to partial charge transfer between Schem and the Pt(111) substrate. Presence of Schem influences thermodynamics of the HUPD on Pt(111) resulting in less-negative values of ΔGads(S)(HUPD). In the absence of Schem, the HUPD is enthalpy-driven whereas in the presence of Schem it becomes entropy-driven. The Pt(111)–HUPD bond energy is weaker in the presence of Schem than in its absence, and this bond energy diminution may be assigned to local electronic effects arising from presence of Schem." @default.
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- W2078334080 date "1998-11-01" @default.
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- W2078334080 title "Coverage evolution of sulfur on Pt(111) electrodes: From compressed overlayers to well-defined islands" @default.
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- W2078334080 doi "https://doi.org/10.1016/s0013-4686(98)00206-0" @default.
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