Abstract The Sn-modified PdPt (Sn/PdPt) electrodes, prepared on Au film substrates by sputtering the PdPt alloy followed by Sn-adsorption, were characterized by cyclic voltammetry and X-ray photoelectron spectroscopy and examined for the reduction of nitrate. The unmodified PdPt (Pd/Pt = 31/69) electrodes did not show any catalytic activity for the nitrate reduction. Tin-modification of the electrodes significantly increased the reduction activity, and the maximum activity was obtained at the Sn surface coverage (θSn) of 0.8. The main reduction product was N2 (44%). Based on the comparison of the observed electrocatalytic activity and product distribution on the Sn/PdPt electrodes and that expected for a physical mixture of Sn/Pt and Sn/Pd, it became clear that there exist synergetic effects between the Pd and Pt on both the activity and N2 production. Further analysis of the product distribution based on the number of bond formations and cleavage clarified that the N2 production capability was enhanced as a result of the enhanced N O bond cleavage, N N bond formation, and the reduced N H bond formation.

中文翻译：

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锡改性钯铂电极上硝酸盐的还原

摘要 Sn 修饰的 PdPt (Sn/PdPt) 电极是通过溅射 PdPt 合金然后吸附 Sn 在 Au 膜基板上制备的，通过循环伏安法和 X 射线光电子能谱进行表征，并检查硝酸盐的还原情况。未改性的 PdPt (Pd/Pt = 31/69) 电极对硝酸盐还原没有表现出任何催化活性。电极的锡改性显着提高了还原活性，并且在 Sn 表面覆盖率 (θSn) 为 0.8 时获得了最大活性。主要的还原产物是 N2 (44%)。基于在 Sn/PdPt 电极上观察到的电催化活性和产物分布与预期的 Sn/Pt 和 Sn/Pd 物理混合物的比较，很明显，Pd 和 Pt 之间对活性和 N2 产生存在协同效应。基于键形成和断裂的数量对产物分布的进一步分析表明，由于 NO 键断裂、NN 键形成和 NH 键形成减少，N2 生产能力增强。