Several bimetallic PtSn catalysts supported on multiwalled carbon nanotubes for ethanol electro-oxidation were prepared by conventional impregnation-reduction method. The Pt loading was kept at 20 wt.% and Pt:Sn atomic ratios of 5:1, 3:1, and 1:1 were selected. The catalysts were structurally characterized by temperature programmed reduction, X-ray diffraction, X-ray photoelectron spectroscopy, H₂ chemisorption, cyclohexane dehydrogenation reaction, and transmission electron microscopy. The electrochemical characterization of the electrocatalytic materials was carried out in acid medium by cyclic voltammetry, linear sweep voltammetry, chronoamperometry, and CO stripping techniques. Among the different stoichiometries tested, the Pt(20)Sn(12.17)/CNT catalyst exhibited the highest electrocatalytic activity for ethanol oxidation reaction, with mass current density of 189.5 mA mgPt⁻¹ at 796 mV (vs. Ag/AgCl).

中文翻译：

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Sn含量对直接乙醇燃料电池应用的Pt/CNT电催化剂的影响

采用传统的浸渍-还原法制备了几种负载在多壁碳纳米管上的双金属 PtSn 催化剂用于乙醇电氧化。Pt 负载量保持在 20 wt.%，选择 Pt:Sn 原子比为 5:1、3:1 和 1:1。通过程序升温还原、X射线衍射、X射线光电子能谱、H _{2对催化剂进行结构表征}化学吸附、环己烷脱氢反应和透射电子显微镜。通过循环伏安法、线性扫描伏安法、计时电流法和CO汽提技术在酸性介质中对电催化材料进行电化学表征。在测试的不同化学计量比中，Pt(20)Sn(12.17)/CNT 催化剂对乙醇氧化反应表现出最高的电催化活性，在 796 mV 时质量电流密度为 189.5 mA mgPt ^-1（与 Ag/AgCl 相比）。