"Electrochemical oxidation of size-selected Pt nanoparticles studied using in situ high-energy-resolution x-ray absorption spectroscopy"

Lindsay Merte,: Farzad Behafarid, Dan Miller, Daniel Friebel, Sang Wan Cho, Felix Mbuga, Dimosthenis Sokaras, Roberto Alonso-Mori, Tsu- Chien Weng, Dennis Nordlund, Anders Nilsson, and Beatriz Roldan Cuenya; ACS Catalysis, 10/01/12.

Additional Authors: Farzad Behafarid, Dan Miller, Daniel Friebel, Sang Wan Cho, Felix Mbuga, Dimosthenis Sokaras, Roberto Alonso-Mori, Tsu- Chien Weng, Dennis Nordlund, Anders Nilsson, and Beatriz Roldan Cuenya

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.