Octahedral PtNi Nanoparticle Catalysts: Exceptional Oxygen Reduction Activity by Tuning the Alloy Particle Surface Composition

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• 作者：Chunhua Cui ; Lin Gan ; Hui-Hui Li ; Shu-Hong Yu ; Marc Heggen ; Peter Strasser
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：November 14, 2012
• 年：2012
• 卷：12
• 期：11
• 页码：5885-5889
• 全文大小：310K
• 年卷期：v.12,no.11(November 14, 2012)
• ISSN：1530-6992

文摘

We demonstrate how shape selectivity and optimized surface composition result in exceptional oxygen reduction activity of octahedral PtNi nanoparticles (NPs). The alloy octahedra were obtained by utilizing a facile, completely surfactant-free solvothermal synthesis. We show 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_Pt²) 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.

Keywords:

Surface composition; PtNi octahedra; oxygen reduction reaction; ligand control