Electrochemical Oxidation of Size-Selected Pt Nanoparticles Studied Using in 
Situ High-Energy-Resolution X-ray Absorption Spectroscopy

Merte, Lindsay R.; Behafarid, Farzad; Miller, Daniel J.; Friebel, Daniel; Cho, Sangwan; Mbuga, Felix; Sokaras, Dimosthenis; Alonso-Mori, Roberto; Weng, Tsu-Chien; Nordlund, Dennis; Nilsson, Anders; Roldan Cuenya, Beatriz

doi:10.1021/cs300494f

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Electrochemical Oxidation of Size-Selected Pt Nanoparticles Studied Using in Situ High-Energy-Resolution X-ray Absorption Spectroscopy

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Merte, L. R., Behafarid, F., Miller, D. J., Friebel, D., Cho, S., Mbuga, F., et al. (2012). Electrochemical Oxidation of Size-Selected Pt Nanoparticles Studied Using in Situ High-Energy-Resolution X-ray Absorption Spectroscopy. ACS Catalysis, 2(11), 2371-2376. doi:10.1021/cs300494f.

Cite as: https://hdl.handle.net/21.11116/0000-0006-CD0E-5

Abstract

High-energy-resolution fluorescence-detected X-ray absorption spectroscopy (HERFD-XAS) has been applied to study the chemical state of ∼1.2 nm size-selected Pt nanoparticles (NPs) in an electrochemical environment under potential control. Spectral features due to chemisorbed hydrogen, chemisorbed O/OH, and platinum oxides can be distinguished with increasing potential. Pt electro-oxidation follows two competitive pathways involving both oxide formation and Pt dissolution.