双金属纳米颗粒中容纳氢摄取的相变直接观察
Direct observation of phase change accommodating hydrogen uptake in bimetallic nanoparticles
AI总结：
本研究利用前沿X射线与电子技术观察Pd-Ni双金属纳米颗粒吸氢时的相变，发现Pd核破裂成小区块以增加表面积并提升储氢容量，为设计经济高效的多金属储氢系统提供了原子级理解。
摘要：
氢作为化石燃料的更清洁替代品前景广阔，但其高效且经济的存储仍是一项重大挑战。诸如 Pd-Ni 的双金属系统为存储氢提供了有前景的选择。本研究结合多种前沿 X 射线与电子技术，观察了 Pd-Ni 纳米颗粒的转变，其最初由环绕富 Pd 核的富 NiO 壳层组成，但在与氢相互作用时发生了重大转变。在暴露于氢期间，Pd 核破裂成更小的区块，显著增加了其表面积并提升了储氢容量，尤其是在 Pd 含量较低的纳米颗粒中。这些发现为储氢过程中原子尺度的形态变化提供了深刻理解，并有助于利用多金属系统设计经济高效的储氢方案。
英文摘要：
Hydrogen holds great promise as a cleaner alternative to fossil fuels, but its efficient and affordable storage remains a significant challenge. Bimetallic systems, such as Pd-Ni, present a promising option for storing hydrogen. In this study, using the combination of different cuttingedge X-ray and electron techniques, we observed the transformations of Pd-Ni nanoparticles, which initially consist of a NiO-rich shell surrounding a Pd-rich core but undergo a major transformation when interacting with hydrogen. During the hydrogen exposure, the Pd core breaks into smaller pockets, dramatically increasing its surface area and enhancing the hydrogen storage capacity, especially in nanoparticles with lower Pd content. The findings provide deep understanding of the morphological changes at the atomic level during hydrogen storage and contribute for designing cost-effective hydrogen storage using multi-metallic systems.
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