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Adsorbate‐Induced Surface Segregation for Core–Shell Nanocatalysts
Author(s) -
Mayrhofer Karl J. J.,
Juhart Viktorija,
Hartl Katrin,
Hanzlik Marianne,
Arenz Matthias
Publication year - 2009
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200806209
Subject(s) - nanomaterial based catalyst , platinum , catalysis , alloy , annealing (glass) , nanoparticle , chemical engineering , materials science , particle (ecology) , carbon fibers , platinum nanoparticles , shell (structure) , chemistry , nanotechnology , metallurgy , composite material , organic chemistry , composite number , oceanography , geology , engineering
Coming to the surface : The surface composition of carbon‐supported Pt 3 Co catalyst particles changes upon a CO‐annealing treatment. Platinum atoms segregate to the particle surface so that nanoparticles with a platinum shell surrounding an alloy core are formed. This modified catalyst has a superior activity in the oxygen reduction reaction compared to both a plain platinum catalyst and the untreated alloy particles.