Atomistic Understanding on the Origin of High Oxygen Reduction Electrocatalytic Activity of Cuboctahedral Pt3Co-Pt Core-Shell Nanoparticles
This time, we report the synthesis of truncated cuboctahedral Pt3Co-Pt core-shell nanoparticles. These nanoparticles are composed of a complete Pt monolayer skin, followed by layers with a ~78 At% of Pt, in a Pt3Co configuration, and finally a Co rich core with just 64 At% of Pt. This specific configuration exhibit an electrocatalytic activity ~6 times higher than commercial 30%-Pt/Vulcan. This work has been published in the Journal of Catalysis Science & Technology, and can be downloaded here.
Guangzhi Hu, Eduardo Gracia-Espino, Robin Sandström, Tiva Sharifi, Shaodong Cheng, Hangjia Shen, Chuanyi Wang, Shaojun Guo, Guang Yang, Thomas Wågberg.
Catal. Sci.Technol., 2015, DOI: 10.1039/C5CY01128K
PtM-based core-shell nanoparticles are a new class of active and stable nanocatalysts to promote oxygen reduction reaction (ORR), however, the understanding at atomistic level of their high electrocatalytic performance for ORR is still a great challenge. Herein, we report a synthesis of highly ordered, and homogeneous truncated cuboctahedral Pt3Co-Pt core-shell nanoparticles (cs-Pt3Co). By combining atomic resolution electron microscopy, X-ray photoelectron spectroscopy, extensive first-principles calculations, and many other characterization techniques, we conclude that the cs-Pt3Co nanoparticles are composed of a complete or nearly complete Pt monolayer skin, followed by a secondary shell containing 5-6 layers with a ~78 At% of Pt, in a Pt3Co configuration, and finally a Co rich core with 64 At% of Pt. Only this particular structure is consistent with the very high electrocatalytic activity of cs-Pt3Co nanoparticles for ORR, which is about 6 times higher than commercial 30%-Pt/Vulcan, and 5 times more active than non-faceted (spherical) alloy Pt3Co nanoparticles. Our study gives an important insight into the atomistic design and understanding of advanced bimetallic nanoparticles for ORR catalysis and other important industrial catalytic applications.
Nano for Energy group
Comprehensive Study of an Earth-Abundant Bifunctional 3D Electrode for Efficient Water Electrolysis in Alkaline Medium.
ACS Appl. Mater. Interfaces, 2015, 7, 28148
C60/Collapsed Carbon Nanotube Hybrids - A Variant of Peapods.
Nano Lett., 2015, 15 (2), pp 829–834
Fabrication of One-Dimensional Zigzag [6,6]-Phenyl-C61-Butyric Acid Methyl Ester Nanoribbons from Two-Dimensional Nanosheets.
ACS Nano, 2015, 9, 10516
Hierarchical self-assembled structures based on nitrogen-doped carbon nanotubes as advanced negative electrodes for Li-ion batteries and 3D microbatteries.
J. P. Sources, 2015, 279, 581
.Self-Assembly Synthesis of Decorated Nitrogen-Doped Carbon Nanotubes with ZnO Nanoparticles: Anchoring Mechanism and the Effects of Sulfur.
J. Phys. Chem. C, 120, 27849 (2016)
Sn/Be Sequentially co-doped Hematite Photoanodes for Enhanced Photoelectrochemical Water Oxidation: Effect of Be2+ as co-dopant.
Sci Rep. 2016; 6: 23183.
Atomistic understanding of the origin of high oxygen reduction electrocatalytic activity of cuboctahedral Pt3Co–Pt core–shell nanoparticles.
Catal. Sci. Technol., 2016, 6, 1393-1401
Photocatalytic reduction of CO2 with H2O over modified TiO2 nanofibers: Understanding the reduction pathway.
Nano Res. (2016) 9: 1956.