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Surface analysis and electrochemical characterization of palladium–cobalt nanoring formation from molecular precursor, [Et 3 NH] 2 [CoPd 2 (μ‐4‐I‐3,5‐Me 2 pz) 4 Cl 4 ], on highly ordered pyrolytic graphite
Author(s) -
ArroyoRamírez Lisandra,
Raptis Raphael G.,
Cabrera Carlos R.
Publication year - 2013
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5318
Subject(s) - bimetallic strip , highly oriented pyrolytic graphite , palladium , materials science , x ray photoelectron spectroscopy , cobalt , electrochemistry , catalysis , nanotechnology , chemical engineering , chemistry , scanning tunneling microscope , metal , electrode , organic chemistry , engineering , metallurgy
A Pd 2 Co precursor, [Et 3 NH] 2 [CoPd 2 (μ‐4‐I‐3,5‐Me 2 pz) 4 Cl 4 ], was used to synthesize palladium–cobalt nanorings and nanoparticles on highly ordered pyrolytic graphite (HOPG) surface. Different types of nanostructures were formed on HOPG surfaces and were controlled by relative humidity (%RH). These structures included Pd 2 Co nanorings on HOPG surface by self‐assembly with humidity control. The %RH affects the size and dispersion of the self‐formation of the Pd 2 Co rings on HOPG surfaces. The modified HOPG surface with Pd 2 Co precursor at 80%RH has rings of similar sizes, while modification at 76%RH gives well‐formed rings and 70%RH with smaller diameters. After thermal reduction of the Pd 2 Co precursor on HOPG, bimetallic nanostructures were formed. X‐ray photoelectron spectroscopy, atomic force microscopy and scanning electron microscopy with energy‐dispersive X‐ray fluorescence spectroscopy techniques were employed to study the composition and morphology of the nanostructures formations on the HOPG surface. Electrochemical characterization of the Pd 2 Co nanostructures was performed. Moreover, the bimetallic catalyst has electrocatalytic activity for the oxygen reduction reaction. Copyright © 2013 John Wiley & Sons, Ltd.