---
_id: '40984'
abstract:
- lang: eng
  text: A two-step seeded-growth method was refined to synthesize Au@Pd core@shell
    nanoparticles with thin Pd shells, which were then deposited onto alumina to obtain
    a supported Au@Pd/Al2O3 catalyst active for prototypical CO oxidation. By the
    strict control of temperature and Pd/Au molar ratio and the use of l-ascorbic
    acid for making both Au cores and Pd shells, a 1.5 nm Pd layer is formed around
    the Au core, as evidenced by transmission electron microscopy and energy-dispersive
    spectroscopy. The core@shell structure and the Pd shell remain intact upon deposition
    onto alumina and after being used for CO oxidation, as revealed by additional
    X-ray diffraction and X-ray photoemission spectroscopy before and after the reaction.
    The Pd shell surface was characterized with in situ infrared (IR) spectroscopy
    using CO as a chemical probe during CO adsorption–desorption. The IR bands for
    CO ad-species on the Pd shell suggest that the shell exposes mostly low-index
    surfaces, likely Pd(111) as the majority facet. Generally, the IR bands are blue-shifted
    as compared to conventional Pd/alumina catalysts, which may be due to the different
    support materials for Pd, Au versus Al2O3, and/or less strain of the Pd shell.
    Frequencies obtained from density functional calculations suggest the latter to
    be significant. Further, the catalytic CO oxidation ignition-extinction processes
    were followed by in situ IR, which shows the common CO poisoning and kinetic behavior
    associated with competitive adsorption of CO and O2 that is typically observed
    for noble metal catalysts.
author:
- first_name: Yanyue
  full_name: Feng, Yanyue
  last_name: Feng
- first_name: Andreas
  full_name: Schaefer, Andreas
  last_name: Schaefer
- first_name: Anders
  full_name: Hellman, Anders
  last_name: Hellman
- first_name: Mengqiao
  full_name: Di, Mengqiao
  last_name: Di
- first_name: Hanna
  full_name: Härelind, Hanna
  last_name: Härelind
- first_name: Matthias
  full_name: Bauer, Matthias
  id: '47241'
  last_name: Bauer
  orcid: 0000-0002-9294-6076
- first_name: Per-Anders
  full_name: Carlsson, Per-Anders
  last_name: Carlsson
citation:
  ama: Feng Y, Schaefer A, Hellman A, et al. Synthesis and Characterization of Catalytically
    Active Au Core─Pd Shell Nanoparticles Supported on Alumina. <i>Langmuir</i>. 2022;38(42):12859-12870.
    doi:<a href="https://doi.org/10.1021/acs.langmuir.2c01834">10.1021/acs.langmuir.2c01834</a>
  apa: Feng, Y., Schaefer, A., Hellman, A., Di, M., Härelind, H., Bauer, M., &#38;
    Carlsson, P.-A. (2022). Synthesis and Characterization of Catalytically Active
    Au Core─Pd Shell Nanoparticles Supported on Alumina. <i>Langmuir</i>, <i>38</i>(42),
    12859–12870. <a href="https://doi.org/10.1021/acs.langmuir.2c01834">https://doi.org/10.1021/acs.langmuir.2c01834</a>
  bibtex: '@article{Feng_Schaefer_Hellman_Di_Härelind_Bauer_Carlsson_2022, title={Synthesis
    and Characterization of Catalytically Active Au Core─Pd Shell Nanoparticles Supported
    on Alumina}, volume={38}, DOI={<a href="https://doi.org/10.1021/acs.langmuir.2c01834">10.1021/acs.langmuir.2c01834</a>},
    number={42}, journal={Langmuir}, publisher={American Chemical Society (ACS)},
    author={Feng, Yanyue and Schaefer, Andreas and Hellman, Anders and Di, Mengqiao
    and Härelind, Hanna and Bauer, Matthias and Carlsson, Per-Anders}, year={2022},
    pages={12859–12870} }'
  chicago: 'Feng, Yanyue, Andreas Schaefer, Anders Hellman, Mengqiao Di, Hanna Härelind,
    Matthias Bauer, and Per-Anders Carlsson. “Synthesis and Characterization of Catalytically
    Active Au Core─Pd Shell Nanoparticles Supported on Alumina.” <i>Langmuir</i> 38,
    no. 42 (2022): 12859–70. <a href="https://doi.org/10.1021/acs.langmuir.2c01834">https://doi.org/10.1021/acs.langmuir.2c01834</a>.'
  ieee: 'Y. Feng <i>et al.</i>, “Synthesis and Characterization of Catalytically Active
    Au Core─Pd Shell Nanoparticles Supported on Alumina,” <i>Langmuir</i>, vol. 38,
    no. 42, pp. 12859–12870, 2022, doi: <a href="https://doi.org/10.1021/acs.langmuir.2c01834">10.1021/acs.langmuir.2c01834</a>.'
  mla: Feng, Yanyue, et al. “Synthesis and Characterization of Catalytically Active
    Au Core─Pd Shell Nanoparticles Supported on Alumina.” <i>Langmuir</i>, vol. 38,
    no. 42, American Chemical Society (ACS), 2022, pp. 12859–70, doi:<a href="https://doi.org/10.1021/acs.langmuir.2c01834">10.1021/acs.langmuir.2c01834</a>.
  short: Y. Feng, A. Schaefer, A. Hellman, M. Di, H. Härelind, M. Bauer, P.-A. Carlsson,
    Langmuir 38 (2022) 12859–12870.
date_created: 2023-01-30T16:22:57Z
date_updated: 2023-01-31T08:00:11Z
department:
- _id: '35'
- _id: '306'
doi: 10.1021/acs.langmuir.2c01834
intvolume: '        38'
issue: '42'
keyword:
- Electrochemistry
- Spectroscopy
- Surfaces and Interfaces
- Condensed Matter Physics
- General Materials Science
language:
- iso: eng
page: 12859-12870
publication: Langmuir
publication_identifier:
  issn:
  - 0743-7463
  - 1520-5827
publication_status: published
publisher: American Chemical Society (ACS)
status: public
title: Synthesis and Characterization of Catalytically Active Au Core─Pd Shell Nanoparticles
  Supported on Alumina
type: journal_article
user_id: '48467'
volume: 38
year: '2022'
...