Science· 2014Q1
Highly Crystalline Multimetallic Nanoframes with Three-Dimensional Electrocatalytic Surfaces
- 2,762citations
- Q1SCImago
- 2014year
Short summary
A new class of electrocatalysts, Pt3Ni nanoframes, were synthesized by transforming PtNi3 polyhedra, achieving 36x mass activity and 22x specific activity for oxygen reduction reactions compared to state-of-the-art Pt-C catalysts.
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Key points
- Pt3Ni nanoframes were synthesized from PtNi3 polyhedra via interior erosion.
- The nanoframes possess 3D molecular accessibility with nanosegregated Pt-skin structure on all surfaces.
- Pt3Ni nanoframes achieved 36x mass activity and 22x specific activity for oxygen reduction reactions (ORR).
- The new catalysts show enhanced durability under reaction conditions compared to Pt-C catalysts.
AI-generated from the title and abstract; the full text is not read.
Abstract
Control of structure at the atomic level can precisely and effectively tune catalytic properties of materials, enabling enhancement in both activity and durability. We synthesized a highly active and durable class of electrocatalysts by exploiting the structural evolution of platinum-nickel (Pt-Ni) bimetallic nanocrystals. The starting material, crystalline PtNi3 polyhedra, transforms in solution by interior erosion into Pt3Ni nanoframes with surfaces that offer three-dimensional molecular accessibility. The edges of the Pt-rich PtNi3 polyhedra are maintained in the final Pt3Ni nanoframes. Both the interior and exterior catalytic surfaces of this open-framework structure are composed of the nanosegregated Pt-skin structure, which exhibits enhanced oxygen reduction reaction (ORR) activity. The Pt3Ni nanoframe catalysts achieved a factor of 36 enhancement in mass activity and a factor of 22 enhancement in specific activity, respectively, for this reaction (relative to state-of-the-art platinum-carbon catalysts) during prolonged exposure to reaction conditions.
The authors' abstract, as published at the source. Science, 2014 · DOI ↗
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Field: Renewable Energy, Sustainability and the Environment
Renewable Energy, Sustainability and the EnvironmentEnergy