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首页> 外文期刊>Electrochimica Acta >Electrochemical and structural characterization of carbon-supported Pt-Pd bimetallic electrocatalysts prepared by electroless deposition
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Electrochemical and structural characterization of carbon-supported Pt-Pd bimetallic electrocatalysts prepared by electroless deposition

机译：化学沉积法制备的碳载Pt-Pd双金属电催化剂的电化学和结构表征

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摘要

Electrochemical and structural characteristics of various Pt-Pd/C bimetallic catalysts prepared by electroless deposition (ED) methods have been investigated. Structural analysis was conducted by X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy, scanning transmission electron microscopy, and energy dispersive X-ray spectroscopy (EDS). Monometallic Pt or Pd particles were not detected by EDS, indicating the ED methodology formed only bimetallic particles. The size of the Pt-Pd bimetallic particles was smaller than those of a commercially available Pt/C catalyst. The morphology of the Pt on Pd/C catalysts was identified and corresponded to Pd particles partially encapsulated by Pt. The electrochemical characteristics of the lowest Pd loading catalyst (7.0% Pt on 0.5% Pd/C) for the oxygen reduction reaction (ORR) have been investigated by the rotating ring disk electrode technique. The electrochemical activity was equal or lower than the commercially available Pt/C catalyst; however, the amount of hydrogen peroxide observed at the ring was reduced by the Pd, suggesting that such a catalyst has the potential to decrease ionomer degradation in applications. The Pt on Pd/C catalysts also show a higher tolerance to ripening induced by potential cycling. Therefore, catalyst suitability cannot be judged solely by its initial performance; information related to specific degradation mechanisms is also needed for a more complete assessment.
机译：研究了通过化学沉积（ED）方法制备的各种Pt-Pd / C双金属催化剂的电化学和结构特征。结构分析通过X射线衍射光谱，X射线光电子光谱，扫描透射电子显微镜和能量色散X射线光谱（EDS）进行。 EDS未检测到单金属Pt或Pd颗粒，这表明ED方法仅形成了双金属颗粒。 Pt-Pd双金属颗粒的尺寸小于市售Pt / C催化剂的尺寸。鉴定了Pd / C催化剂上Pt的形态，并对应于被Pt部分包裹的Pd颗粒。通过旋转环盘电极技术研究了用于氧还原反应（ORR）的最低Pd负载催化剂（7.0％Pt在0.5％Pd / C上）的电化学特性。电化学活性等于或低于市售的Pt / C催化剂。但是，在环上观察到的过氧化氢的量被Pd减少，表明这种催化剂具有减少应用中离聚物降解的潜力。 Pd / C催化剂上的Pt还表现出对潜在循环诱导的成熟的更高耐受性。因此，催化剂的适用性不能仅通过其初始性能来判断。还需要与特定降解机制有关的信息以进行更完整的评估。

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