Abstract Palladium-based electrocatalysts have become an important research field in energy generation. Introducing another metal element in palladium-based catalysts may improve the electrocatalytic performance while reducing costs. In this work, colloidal nanocrystal assembly (CNA) of Pd3Pb alloy has been synthesized via an aqueous-solution synthesis method. The content of Pb in Pd3Pb CNAs can be adjusted to obtain an optimal value with the highest catalytic current density of 3543 mA/mgPd. Meantime, the morphology of the Pd3Pb catalysts was found to form the well-separated spherical structures with the size range from 120 nm to 140 nm. The variation of the molar ratio of elements Pd and Pb in Pd3Pb CNAs leads to form mainly spherical assemblies with a minor part of nanoparticles. Combined the XRD, TEM and electrochemical results, the high catalytic performance towards electrooxidation of ethanol for Pd3Pb CNAs was suggested to be ascribed to the nature of small crystallite sizes and the assembly structure along with the formation of bimetallic alloy.

中文翻译：

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Pd3Pb胶体纳米晶组装体的合成及其对乙醇氧化的电催化活性

摘要 钯基电催化剂已成为能源发电的重要研究领域。在钯基催化剂中引入另一种金属元素可以提高电催化性能，同时降低成本。在这项工作中，通过水溶液合成方法合成了 Pd3Pb 合金的胶体纳米晶体组件 (CNA)。Pd3Pb CNA中Pb的含量可以调整以获得最佳值，最高催化电流密度为3543 mA/mgPd。同时，发现 Pd3Pb 催化剂的形态形成了分离良好的球形结构，尺寸范围为 120 nm 至 140 nm。Pd3Pb CNA 中元素 Pd 和 Pb 的摩尔比的变化导致形成主要为球形的组件和少量的纳米颗粒。结合XRD、TEM和电化学结果，