Atomic Structure and Composition of "Pt3Co" Nanocatalysts in Fuel Cells: An Aberration-Corrected STEM HAADF Study

作者：Patrick Brian; Ham Hyung Chul; Shao Horn Yang; Allard Lawrence F; Hwang Gyeong S; Ferreira Paulo J^*

来源：Chemistry of Materials, 2013, 25(4): 530-535.

DOI：10.1021/cm3029164

• PEM fuel cells
• platinum-alloyed catalysts
• aberration-corrected STEM
• nanoparticles

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.

• 出版日期2013-2-26