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Nano Letters 15 (2015) 7473-7480

Octahedral PtNiCo alloy nanoparticles as active electrocatalysts for oxygen reduction reactions: evolution of their atomic-scale structure, chemical composition and reactivity

by Rosa M Arán-Ais, Fabio Dionigi, Thomas Merzdorf, Martin Gocyla, Marc Heggen, Rafal E Dunin-Borkowski, Manuel Gliech, José Solla-Gullón, Enrique Herrero, Juan M Feliu, and Peter Strasser

Multimetallic shape-controlled nanoparticles offer great opportunities to tune the activity, selectivity and stability of electrocatalytic surface reactions. However, in many cases, the synthetic control over particle size, composition and shape is limited requiring trial and error. Deeper atomic-scale insight in the particle formation process would enable more rational syntheses.

In the present study, researchers from the Ernst Ruska-Centre togehter with colleagues from Universidad de Alicante and Technical Unversity Berlin have studied trimetallic PtNiCo nanooctahedrons obtained via a low-temperature, surfactant-free solvothermal “one-step” and a new developed "two-step" synthesis route. The composition and morphology of the particles was investigated at the atomic scale using high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and energy dispersive X-ray (EDX) elemental mapping techniques. Evidence is provided of a heterogeneous element distribution caused by element-specific anisotropic growth and create octahedral nanoparticles with tailored atomic composition.

Further reading:

Rosa M Arán-Ais, Fabio Dionigi, Thomas Merzdorf, Martin Gocyla, Marc Heggen, Rafal E Dunin-Borkowski, Manuel Gliech, José Solla-Gullón, Enrique Herrero, Juan M Feliu, and Peter Strasser: Octahedral PtNiCo alloy nanoparticles as active electrocatalysts for ORR: evolution of their atomic-scale structure, chemical composition and reactivity, Nano Letters 15 (2015) 7473-7480.
   
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