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Obtaining Clean and Well-dispersed Pt NPs with a Microwave-assisted Method

机译：微波辅助获得干净分散的Pt NPs

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摘要

Carbon-supported platinum nanoparticles Pt/C (NPs) are used in many fields of science. These kinds of materials have been extensively studied in electrochemistry due to the fact that they are applied in fuel cell technology. Although there are a myriad of methods for Pt NP synthesis the need for obtaining Pt/C NPs with a good dispersion (covering over the entire support), a narrow size distribution and clean surface (among other parameters) is far to be overcome. On this sense herein we describe a very easy and quick method of synthesis of highly dispersed PtNPs followed by a simple electrochemical cleaning step. The catalysts were elec-trochemically characterized by studying their behavior in 0.5 M H2SO4 and also by using CO as a probe during the CO electro-oxidation reaction (COEOR). This paper shows how to obtain highly dispersed and clean Pt/C NPs that produce very reproducible results. Besides, we demonstrate how the presence of impurities negatively affects the electrochemical reproducibility of Pt NPs with a clear impact on their catalytic activity.
机译：碳负载的铂纳米颗粒Pt / C（NPs）被用于许多科学领域。由于这类材料已应用于燃料电池技术，因此已在电化学领域进行了广泛的研究。尽管存在多种Pt NP合成方法，但仍需要克服获得具有良好分散性（覆盖整个载体），窄粒度分布和清洁表面（除其他参数外）的Pt / C NP的需要。在此意义上，我们描述了一种非常简单，快速的合成高度分散的PtNP的方法，然后进行简单的电化学清洗步骤。通过研究催化剂在0.5 M H2SO4中的行为以及在CO电氧化反应（COEOR）期间使用CO作为探针对催化剂进行电化学表征。本文展示了如何获得高度分散和清洁的Pt / C NP，它们可产生非常可重复的结果。此外，我们证明了杂质的存在如何对Pt NPs的电化学再现性产生负面影响，并对其催化活性产生明显影响。

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