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Tuning of the surface composition of octahedral PtNi nanoparticles

1. Oktober 2012

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Octahedral PtNi nanoparticle catalysts – Exceptional oxygen reduction activity by tuning the alloy particle surface composition


by Chunhua Cui, Lin Gan, Hui-Hui Li, Shu-Hong Yu, Marc Heggen, and Peter Strasser


In a recent study researchers from the Technical University Berlin, The University of Science and Technology of China in Hefei and the Jülich Research Centre demonstrate how shape selectivity and optimised surface composition result in exceptional oxygen reduction activity of octahedral PtNi nanoparticles (NPs).

The alloy octahedra were obtained by utilising a facile, completely surfactant-free solvothermal synthesis. It was shown that the choice of precursor ligands controls the shape, while the reaction time tunes the surface Pt:Ni composition. The 9.5 nm sized PtNi octahedra reached a 10-fold surface area-specific (~ 3.14 mA/cm^2_{Pt} ) as well as an unprecedented 10-fold Pt mass based (∼1.45 A/mg_{Pt}) activity gain over the state-of-art Pt electrocatalyst, approaching the theoretically predicted limits.


Further reading:

Chunhua Cui, Lin Gan, Hui-Hui Li, Shu-Hong Yu, Marc Heggen, and Peter Strasser: Octahedral PtNi nanoparticle catalysts - exceptional oxygen reduction activity by tuning the alloy particle surface composition, Nano Letters XXX (2012) YYY-ZZZ.


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