结合扫描透射电子显微技术、电子层析技术及能量色散谱(EDS)成分的三维重构对纳米多孔Au和纳米多孔Au-Pt孔棱的表面结构和成分进行了分析。利用原子分辨率的电子层析技术分析了纳米多孔Au孔棱表面的原子结构，发现表面的缺陷可以分为2类，一类是{111}平台上的扭折和台阶，一类是表面凹坑。相比于扭折和台阶，表面凹坑会引入更多低配位位点。将原子级电子层析与EDS成分三维重构相结合，分析了Pt元素在孔棱表面的偏聚情况，证明了Pt在孔棱表面低配位位点的偏聚。

Nanoporous metals have a porous structure with bicontinuous nanoscale voids and ligaments. Thus, nanoporous metals differ from their bulk counterparts in mechanical, physical, and chemical characteristics due to their unique ligament structure and high surface-to-volume ratio. The surface structure and chemistry of nanoporous metals play critical roles in their applications in catalysis, sensing, and other fields. The surfaces of nanoporous metals contain a substantial number of low-coordination sites, which are vital for improving their catalytic performance. Moreover, the addition of platinum to nanoporous gold has a massive impact on its catalytic and mechanical characteristics. High-resolution transmission electron microscopy (TEM) and high-resolution scanning transmission electron microscopy (STEM) are commonly used to study the atomic structure of crystals. However, since these techniques only provides two-dimensional projection images, it is usually hard or even impossible to directly and quantitatively resolve the three-dimensional (3D) structure of nanocrystals, especially their surface crystallography and coordination information. Compared to traditional TEM and STEM imaging technologies, electron tomography with atomic resolution provides a powerful means to resolve 3D atomic-resolution information of materials. In this work, the surface structure and chemical composition of nanoporous gold and nanoporous gold-platinum were analyzed using STEM, electron tomography, and three-dimensional reconstruction of energy dispersive spectroscopy (EDS) results. The atomic structure of the ligament surface was examined using electron tomography with atomic resolution. It was observed that, surface defects can be separated into two categories: kinks and steps on the {111} terrace, and dents and pits. Surface dents and pits introduce a greater number of low-coordination sites than kinks and steps. Furthermore, the segregation of Pt on the ligament surface was discovered by combining the atomic-resolution electron tomography with the 3D reconstruction of EDS results.