论文标题
成像电化学环境中铂纳米颗粒的呼吸
Imaging the Breathing of a Platinum Nanoparticle in Electrochemical Environment
论文作者
论文摘要
表面应变广泛用于气相催化和电催化中，以控制金属表面上的吸附物的结合能。但是，$ $ $ $ $ situ $或$ operando $菌株测量在实验上具有挑战性，尤其是在纳米材料上。在这里，我们利用了4 $^{th} $发电的极其出色的来源，在欧洲同步加速器辐射设施（ESRF-EBS，Grenoble，France，France）来量化PT纳米颗粒内部的应变分布，并确定其在电化学环境中的形态。我们的结果首次表明了高度协调（{100}和{111}方面）与未协调的原子（边缘和角落）之间的异质和潜在依赖性应变分布的证据，以及从表面到纳米粒子的大块的应变传播的证据。这些结果提供了动态的结构见解，以更好地模拟和设计有效的纳米催化剂来存储和转换应用。
Surface strain is widely used in gas phase catalysis and electrocatalysis to control the binding energies of adsorbates on metal surfaces. However, $in$ $situ$ or $operando$ strain measurements are experimentally challenging, especially on nanomaterials. Here, we take advantage of the 4$^{th}$ generation Extremely Brilliant Source at the European Synchrotron Radiation Facility (ESRF-EBS, Grenoble, France) to quantify the distribution of strain inside a Pt nanoparticle, and to determine its morphology in an electrochemical environment. Our results show for the first time evidence of heterogeneous and potential-dependent strain distribution between highly-coordinated ({100} and {111} facets) and under-coordinated atoms (edges and corners) as well as evidence of strain propagation from the surface to the bulk of the nanoparticle. These results provide dynamic structural insights to better simulate and design efficient nanocatalysts for energy storage and conversion applications.
