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首页> 外文期刊>Electrocatalysis >Electrochemical and Fuel Cell Evaluation of Ptlr/C Electrocatalysts for Ethanol Electrooxidation in Alkaline Medium
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Electrochemical and Fuel Cell Evaluation of Ptlr/C Electrocatalysts for Ethanol Electrooxidation in Alkaline Medium

机译：Ptlr / C电催化剂在碱性介质中乙醇电氧化的电化学和燃料电池评估

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Ptlr/C electrocatalysts prepared by borohydride reduction process were characterized by X-ray diffraction, transmission electron microscopy, and cyclic voltammetry. The X-ray diffraction measurements suggested the Ptlr alloy formation; furthermore, peaks of IrO2 were not observed; nevertheless, the presence of Ir oxides in small amounts and amorphous forms cannot be discarded. The transmission electron microscopy showed the average particle diameter between 4.0 and 6.0 nm for all compositions prepared. The catalytic activity for ethanol electrooxidation in alkaline medium at room temperature (cyclic voltammetry and chronoamperometry results) showed that Ptlr/C (70:30) and Ptlr (90:10) exhibited higher performance toward ethanol oxidation than the other electrocatalysts. Experiments using direct ethanol alkaline fuel cell at 75 °C showed Ptlr (90:10) as the best electrocatalyst and hVC as virtually inactive for ethanol oxidation in real conditions. The best result obtained using Ptlr/C may be associated to the electronic effect between Pt and Ir that could decrease the poisoning on catalyst surface and also by the occurrence of bifunctional mechanism.
机译：通过X射线衍射，透射电镜和循环伏安法对硼氢化物还原法制得的Ptlr / C电催化剂进行了表征。 X射线衍射测量表明形成了Ptlr合金。另外，未观察到IrO 2的峰。然而，不能丢弃少量和无定形形式的Ir氧化物。透射电子显微镜显示所有制备的组合物的平均粒径在4.0和6.0nm之间。室温下碱性介质中乙醇电氧化的催化活性（循环伏安法和计时电流法结果）显示，Ptlr / C（70:30）和Ptlr（90:10）表现出比其他电催化剂更高的乙醇氧化性能。在75°C下使用直接乙醇碱性燃料电池进行的实验表明，Ptlr（90:10）是最好的电催化剂，而hVC在实际条件下对于乙醇氧化几乎没有活性。使用Ptlr / C获得的最佳结果可能与Pt和Ir之间的电子效应有关，该电子效应可以减少催化剂表面的中毒现象，并且还可能与双功能机理的发生有关。

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