Evaluating the 3D Structures of PtNi Nanoparticles from Single Projection ADF STEM Images and EDX Maps
Evaluating the 3D Structures of PtNi Nanoparticles from Single Projection ADF STEM Images and EDX Maps
复制标题
从单投影 ADF STEM 图像和 EDX 图评估 PtNi 纳米粒子的 3D 结构
DOI：
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发表时间：
2018
影响因子：
2.8
通讯作者：
R. Dunin‐Borkowski
中科院分区：
文献类型：
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作者：
K. MacArthur;M. Heggen;R. Dunin‐Borkowski
Pt基纳米颗粒已经证明了作为氢燃料电池中氧还原反应（ORR）催化剂的巨大前景[1]。第二过渡金属如Ni或Co的加入不仅由于Pt金属负载量的减少而降低了催化剂的成本，而且还提供了活性的增加。最近，八面体PtNi纳米颗粒由于Pt3Ni（111）[2]证明的对ORR的异常高的活性而引起了相当大的兴趣。在许多研究中，八面体纳米颗粒的原子尺度结构与其催化性能之间存在着密切的联系。催化的进步依赖于具有精心定制的结构和组成的纳米颗粒的合成和表征。因此，高分辨率三维（3D）表征是其进一步改进的重要步骤。
Pt-based bimetallic nanoparticles have demonstrated great promise as catalysts for the oxygen reduction reaction (ORR) in hydrogen fuel cells [1]. The addition of a second transition metal, such as Ni or Co, not only reduces the cost of the catalyst due to the reduction in Pt metal loading, but also provides an increase in activity. Recently, octahedral PtNi nanoparticles have attracted considerable interest due to the exceptionally high activity for the ORR demonstrated by Pt3Ni (111) [2]. A strong link has been demonstrated between the atomic-scale structures of octahedral nanoparticles and their catalytic performance in a number of studies. Advances in catalysis rely on the synthesis and characterisation of nanoparticles that have carefully tailored structures and compositions. Therefore, high-resolution threedimensional (3D) characterisation is an essential step in their further improvement.