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@ARTICLE{ArnAis:825374,
author = {Arán-Ais, Rosa M. and Solla-Gullón, José and Gocyla,
Martin and Heggen, Marc and Dunin-Borkowski, Rafal and
Strasser, Peter and Herrero, Enrique and Feliu, Juan M.},
title = {{T}he effect of interfacial p{H} on the surface atomic
elemental distribution and on the catalytic reactivity of
shape-selected bimetallic nanoparticles towards oxygen
reduction},
journal = {Nano energy},
volume = {27},
issn = {2211-2855},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2016-07837},
pages = {390 - 401},
year = {2016},
abstract = {The effect of interfacial pH during the surface cleaning of
shape-selected PtNi nanoparticles was investigated.
High-angle annular dark field (HAADF) scanning transmission
electron microscopy (STEM) and energy-dispersive X-ray (EDX)
elemental mapping techniques were used to analyze the
morphology and composition of the particles at the
nanoscale. The particles show similar atomic compositions
for both treated samples but different elemental
distribution on the surface of the nanooctahedra. X-ray
photoelectron spectroscopy (XPS) analysis confirmed
different surface compositions and the presence of different
oxidation states species at the outer part of the
nanoparticles. In addition, we compare characteristic
voltammetric profiles of these nanocatalysts when immersed
in three different aqueous supporting electrolytes (H2SO4,
HClO4 and NaOH). The behavior of the bimetallic
nanoparticles towards adsorbed CO oxidation has been
analyzed and compared with that observed after surface
disordering of the same catalysts. The electrocatalytic
activity of these nanoparticles has been also tested for the
electroreduction of oxygen showing high specific and mass
activity and better catalytic performance than pure Pt
shaped nanoparticles. The different treatments applied to
the surface of the nanocatalysts have led to remarkably
different catalytic responses, pointing out the outstanding
importance of the control of the surface of the alloyed
shape-selected nanoparticles after their synthesis and
before their use as electrocatalysts.},
cin = {PGI-5},
ddc = {540},
cid = {I:(DE-Juel1)PGI-5-20110106},
pnm = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
pid = {G:(DE-HGF)POF3-143},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000384910500043},
doi = {10.1016/j.nanoen.2016.07.024},
url = {https://juser.fz-juelich.de/record/825374},
}