Unexpected compositional and structural modification of CoPt3 nanoparticles by extensive surface purification
Abstract
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.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- 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)
- OSTI Identifier:
- 1481421
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nanoscale
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 14; Journal ID: ISSN 2040-3364
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY
Citation Formats
Mizrahi, Martín D., Krylova, Galyna, Giovanetti, Lisandro J., Ramallo-López, José M., Liu, Yuzi, Shevchenko, Elena V., and Requejo, Félix G.. Unexpected compositional and structural modification of CoPt3 nanoparticles by extensive surface purification. United States: N. p., 2018.
Web. doi:10.1039/c8nr00060c.
Mizrahi, Martín D., Krylova, Galyna, Giovanetti, Lisandro J., Ramallo-López, José M., Liu, Yuzi, Shevchenko, Elena V., & Requejo, Félix G.. Unexpected compositional and structural modification of CoPt3 nanoparticles by extensive surface purification. United States. https://doi.org/10.1039/c8nr00060c
Mizrahi, Martín D., Krylova, Galyna, Giovanetti, Lisandro J., Ramallo-López, José M., Liu, Yuzi, Shevchenko, Elena V., and Requejo, Félix G.. Mon .
"Unexpected compositional and structural modification of CoPt3 nanoparticles by extensive surface purification". United States. https://doi.org/10.1039/c8nr00060c. https://www.osti.gov/servlets/purl/1481421.
@article{osti_1481421,
title = {Unexpected compositional and structural modification of CoPt3 nanoparticles by extensive surface purification},
author = {Mizrahi, Martín D. and Krylova, Galyna and Giovanetti, Lisandro J. and Ramallo-López, José M. and Liu, Yuzi and Shevchenko, Elena V. and Requejo, Félix G.},
abstractNote = {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.},
doi = {10.1039/c8nr00060c},
journal = {Nanoscale},
number = 14,
volume = 10,
place = {United States},
year = {2018},
month = {2}
}
Web of Science
Figures / Tables:

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