Chengshuang Zhou, Gennaro Liccardo, Adam S Hoffman, Jinwon Oh, Sarah E Holmes, Arturas Vailionis, Simon R Bare, Matteo Cargnello
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引用次数: 0
摘要
由不相溶元素制成的双金属合金的特点是在宏观尺度上具有离析倾向，但已知其行为在纳米尺度上会发生变化。在这里，我们证明了在 Ru-In 系统中，In 原子优先装饰 6 nm Ru 纳米粒子的表面，形成 Ru-In 表层不相溶合金。这种表面装饰极大地影响了该体系的催化性能，即使添加到 Ru 中的 In 原子分数很小。Ru 和 In 之间的界面使二氧化碳加氢产生甲醇的能力得到了前所未有的提高，其性能不仅优于单个成分，也优于有序的 RuIn3 金属间合金。我们的工作表明，表面不相溶合金的形成可为理解和设计异相催化剂提供新的见解。
Understanding and Harnessing Nanoscale Immiscibility in Ru-In Alloys for Selective CO2 Hydrogenation.
Bimetallic alloys made from immiscible elements are characterized by their tendency to segregate on the macroscopic scale, but their behavior is known to change at the nanoscale. Here, we demonstrate that in the Ru-In system, In atoms preferentially decorate the surface of 6 nm Ru nanoparticles, forming Ru-In superficial immiscible alloys. This surface decoration dramatically affects the catalytic performance of the system, even at small atomic fractions of In added to Ru. The interfaces between Ru and In enabled unexplored methanol productivity from CO2 hydrogenation, which outperformed not only the individual constituents but also ordered RuIn3 intermetallic alloys. Our work highlights that the formation of superficial immiscible alloys could offer new insights into the understanding and design of heterogeneous catalysts.
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