Unexpected compositional and structural modification of CoPt3 nanoparticles by extensive surface purification

Mizrahi, Martín D.; Krylova, Galyna; Giovanetti, Lisandro J.; Ramallo-López, José M.; Liu, Yuzi; Shevchenko, Elena V.; Requejo, Félix G.

doi:10.1039/c8nr00060c

Title: Unexpected compositional and structural modification of CoPt₃ nanoparticles by extensive surface purification

Journal Article · 19 February 2018 · Nanoscale

DOI: https://doi.org/10.1039/c8nr00060c · OSTI ID:1481421

^[1]; Krylova, Galyna ^[2]; Giovanetti, Lisandro J. ^[1]; Ramallo-López, José M. ^[1]; Liu, Yuzi ^[2];

^[2]; Requejo, Félix G. ^[1]

Univ. Nacional de La Plata, La Plata (Argentina). INIFTA, CONICET and Dpto. Química, Facultad de Ciencias Exactas
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials

We combined synchrotron small angle X-ray scattering, X-ray fluorescence and extended X-ray absorption fine structure spectroscopy to probe the structure of chemically synthesized CoPt₃ nanoparticles (NPs) after ligand removal via the commonly accepted solvent/nonsolvent approach. We showed that the improved catalytic activity of extensively purified NPs could not be explained only in terms of a “cleaner” surface. We found that extensive surface purification results in the substantial leaching of the Co atoms from the chemically synthesized CoPt₃ NPs transforming them into CoPt₃/Pt core/shell structures with an unexpectedly thick (~0.5 nm) Pt shell. We indicated that the improved catalytic activity of extensively purified NPs in octyne hydrogenation reaction can be explained by the formation of CoPt₃/Pt core/shell structures. Also, we demonstrated that drastic compositional and structural transformation of water transferred CoPt₃ NPs was rather a result of extensive removal of native ligands via a solvent/nonsolvent approach than leaching of cobalt atoms in aqueous media. We expect that these findings can be relevant to other transition metal based multicomponent NPs.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Scientific and Technical Research Council; Universidad Nacional de La Plata (UNLP); Laboratorio Nacional de Luz Sincrotron (LNLS)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1481421

Journal Information:: Nanoscale, Vol. 10, Issue 14; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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