Atomic Structure and Composition of "Pt3Co" Nanocatalysts in Fuel Cells: An Aberration-Corrected STEM HAADF Study
Atomic Structure and Composition of "Pt3Co" Nanocatalysts in Fuel Cells: An Aberration-Corrected STEM HAADF Study
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DOI：
10.1021/cm3029164
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发表时间：
2013-02-26
影响因子：
8.6
通讯作者：
Ferreira, Paulo J.
中科院分区：
文献类型：
--
作者：
Patrick, Brian;Ham, Hyung Chul;Ferreira, Paulo J.
Pt3Co纳米颗粒用于促进氧还原动力学和提高质子交换膜（PEM）燃料电池的效率。第一次，像差校正的扫描透射电子显微镜（STEM），STEM图像模拟和DFT计算相结合，以提供洞察Pt3Co纳米粒子的增强催化的起源。酸浸的纳米粒子表现出固溶体结构，但不均匀的组合物，而热处理的纳米粒子表现出有序的结构，除了前三个表面层中观察到Pt富集。
Pt3Co nanoparticles are used to promote the oxygen reduction kinetics and increase the efficiency of proton exchange membrane (PEM) fuel cells. For the first time, aberration-corrected scanning transmission electron microscopy (STEM), STEM image simulations, and DFT calculations are combined to provide insight into the origin of enhanced catalysis of Pt3Co nanoparticles. Acid-leached nanoparticles exhibit a solid-solution structure but heterogeneous composition, while heat-treated nanoparticles exhibit an ordered structure, except for the first three surface layers where Pt enrichment is observed.