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Active and Stable Pt–Ni Alloy Octahedra Catalyst for Oxygen Reduction via Near-Surface Atomical Engineering
journal contribution
posted on 2020-03-19, 18:41 authored by Fanpeng Kong, Zhouhong Ren, Mohammad Norouzi Banis, Lei Du, Xin Zhou, Guangyu Chen, Lei Zhang, Junjie Li, Sizhe Wang, Minsi Li, Kieran Doyle-Davis, Yulin Ma, Ruying Li, Alan Young, Lijun Yang, Matthew Markiewicz, Yujin Tong, Geping Yin, Chunyu Du, Jun Luo, Xueliang SunShape-controlled
Pt-based bimetallic nanocrystals with ultrathin
Pt-rich surfaces are appealing electrocatalysts for some key electrochemical
reactions such as the oxygen reduction reaction (ORR) because of the
synergistic tuning of topological atom configuration and strengthened
electronic effects. However, it is rather challenging to fabricate
such particular structures that can remain intact in harsh electrochemical
environments, as such Pt-based nanocatalysts are unable to simultaneously
achieve both unparalleled activity and robust stability. Here, a facile
surface engineering strategy is proposed and employed to atomically
tailor the near-surface structure of the Pt1.5Ni octahedra.
The engineered Pt–Ni octahedra consist of an ultrathin Pt-rich
shell (∼two atomic layers) and Pt-rich bulk composition. The
optimized octahedral catalyst exhibits superior specific and mass
activity (7.7 mA/cm2 Pt and 1.9 A/mg Pt at 0.9 V) for ORR, ∼20 and ∼10 times higher than commercial
Pt/C, respectively. The ligand and strain effects arising from the
near-surface engineering are unraveled to be responsible for the remarkable
ORR activity. Moreover, it shows robust stability with just 9.2% decay
in mass activity after accelerated degradation tests (ADTs), as its
compositional nature prevents surface Pt atoms and interior Ni atoms
from diffusion and dissolution, compared with a decrease of 33% for
commercial Pt/C. Our atomical engineered surface strategy illustrates
a facile and effective design for a class of Pt-based nanocatalysts
with excellent activity and stability.
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stabilityoptimized octahedral catalyst exhibitsPt 1.5 Ni octahedraPt-based nanocatalystsNear-Surface Atomical Engineering Shape-controlled Pt-based bimetallic nanocrystalssurface Pt atomsoxygen reduction reactionPt-rich bulk compositionADTsurface engineering strategyORRtopological atom configurationultrathin Pt-rich surfaces
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