Phosphine-capped nanoparticles for electrocatalysis

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Date

2021-01-25

Authors

Baar, Kevin Thomas

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Abstract

In this work, a new method of synthesizing gold-rhodium alloyed nanoparticles (Au-Rh NPs), stabilized by triphenylphosphine (PPh₃) ligands is reported. This method has only previously been used to synthesize monometallic Au₅₅(PPh₃)₁₂Cl₆ (Au55) and Rh₅₅(PPh₃)₁₂Cl₆ (Rh55) nanoparticles. The NPs were characterized using transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDS), nuclear magnetic resonance (NMR), and time-offlight secondary ion mass spectrometry (TOF-SIMS). It was observed that the synthesis produced NPs with the same size as Au55 and Rh55 and a wide range of alloy compositions as well as gold nanoparticles (AuNPs) and rhodium nanoparticles (RhNPs). The electrocatalytic activity for the oxygen reduction reaction (ORR) is explored for the AuRh NPs and compared with the activities of Au55 and Rh55 using cyclic voltammetry (CV) and rotating ring disk voltammetry (RRDV).

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