Abstract
PtNi alloy nano-octahedra after thermal reductive annealing: imperfect PtNi octahedra with concave Pt curvature catalytically outperform well-alloyed cuboctahedral nanoparticles with {111} and {100} nanofacets in electrochemical ORR.
Highlights
Single crystal studies have revealed that the oxygen reduction reaction (ORR) on platinum surfaces is a highly structuresensitive electrocatalytic reaction.[1,2] The trend in ORR activity of low-index pure Pt single crystal surfaces in non-adsorbing electrolytes follows the order Pt(100) ( Pt(111) z Pt(110).[3,4]Likewise, Pt alloy surfaces have demonstrated a sensitive dependence of their catalytic ORR activity on their surface atomic arrangement.[4]
This is most likely because none of the reported synthetic routes toward nano-octahedra involved thermal annealing at sufficiently high temperatures, where the thermal segregation of a Pt monolayer on
We study the in uence of the local atomic structural and compositional order of facets of Ni-rich PtNi nano-octahedra on their electrocatalytic ORR activity
Summary
Single crystal studies have revealed that the oxygen reduction reaction (ORR) on platinum surfaces is a highly structuresensitive electrocatalytic reaction.[1,2] The trend in ORR activity of low-index pure Pt single crystal surfaces in non-adsorbing electrolytes follows the order Pt(100) ( Pt(111) z Pt(110).[3,4]Likewise, Pt alloy surfaces have demonstrated a sensitive dependence of their catalytic ORR activity on their surface atomic arrangement.[4]. We analyse the structure, and image and element-map the morphology and composition of PtNi nanoparticles a er thermal reductive annealing, and link them to their ORR activity and stability during potential cycling.
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