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#Multimetal nanoframes improve catalyst performance (Nanowerk News) A team of researchers has synthesized a highly active and durable class of electrocatalysts by exploiting the structural evolution of solid Pt-Ni bimetallic nanocrystals into porous
cage-like structures or nanoframes("Highly Crystalline Multimetallic Nanoframes with Three-dimensional Electrocatalytic Surfaces"."This novel material significantly enhanced catalytic activity for the oxygen reduction reaction--the splitting of an O2 molecule into two oxygen ions--that is critical to fuel cells and potentially other electrochemical applications.
The open structure of the nanoframes addresses some of the major design criteria for advanced nanoscale electrocatalysts, namely, high surface-to-volume ratio, three-dimensional surface accessibility to reactants,
and the University of Wisconsin synthesized a highly active and durable class of electrocatalysts by exploiting the structural evolution of solid Pt-Ni bimetallic nanocrystals into porous cage-like structures or nanoframes.
and at mild temperatures into Pt3ni nanoframes with surfaces that have three-dimensional molecular accessibility. The Pt-rich edges of the starting Ptni3 nanoparticles are maintained in the final Pt3ni nanoframes.
Both the interior and exterior surfaces of this open framework structure are composed of a Pt-rich skin structure that exhibits enhanced oxygen reduction reaction activity.
The Pt3ni nanoframe catalysts achieved a more than 36-fold and 22-fold enhancement in two different measures of catalytic activity (mass and specific activities, respectively) for the oxygen reduction reaction in comparison
The HER activity for highly crystalline Pt3nit-skin nanoframe surface was enhanced by almost one order of magnitude relative to Pt/C. Utilizing the spontaneous structural evolution of a bimetallic nanoparticle from solid polyhedra to hollow nanoframes with controlled size, structure,
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