Publication detail

Generation and Stabilization of Small Platinum Clusters Pt12±x Inside a Metal−Organic Framework

KRATZL, K. KRATKY, T. GÜNTHER, S. TOMANEC, O. ZBOŘIL, R. MICHALIČKA, J. MACÁK, J. COKOJA, M. FISCHER, R.

Original Title

Generation and Stabilization of Small Platinum Clusters Pt12±x Inside a Metal−Organic Framework

Type

journal article in Web of Science

Language

English

Original Abstract

The generation and matrix stabilization of ligand-free, small platinum nanoclusters (NCs) Pt12±x is presented. The metal–organic framework-template approach is based on encapsulating CO-ligated, atom-precise Pt9 Chini clusters [{Pt3(CO)6}3]2– into the zeolitic imidazolate framework ZIF-8. The selective formation of the air-stable inclusion compound [NBu4]2[{Pt3(CO)6}4]@ZIF-8 of defined atomicity Pt12 and with Pt loadings of 1–20 wt % was monitored by UV/vis and IR spectroscopy and was confirmed by high-resolution transmission electron microscopy (HR-TEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray photoelectron spectroscopy (XPS), and powder X-ray diffraction (PXRD). Thermally induced decarbonylation at 200 °C yields the composite material Ptn@ZIF-8 with a cluster atomicity n close to 12, irrespective of the Pt loading. The PtNCs retain their size even during annealing at 300 °C for 24 h and during catalytic hydrogenation of 1-hexene at 25 °C in the liquid phase. The Ptn@ZIF-8 material can conveniently be used for storing small PtNCs and their further processing. Removal of the protective ZIF-8 matrix under acidic conditions and transfer of the PtNCs to carbon substrates yields defined aggregation to small Pt nanoparticles (1.14 ± 0.35 nm, HR-TEM), which have previously shown exceptional performance in the electrocatalytic oxygen reduction reaction (ORR).

Keywords

CATALYTIC-ACTIVITY; CARBONYL DIANIONS; GOLD CLUSTERS; IMIDAZOLATE FRAMEWORKS; SIZE; NANOPARTICLES; LIGANDS; PHASE; MOF; OXIDATION

Authors

KRATZL, K.; KRATKY, T.; GÜNTHER, S.; TOMANEC, O.; ZBOŘIL, R.; MICHALIČKA, J.; MACÁK, J.; COKOJA, M.; FISCHER, R.

Released

4. 9. 2019

ISBN

0002-7863

Periodical

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

Year of study

141

Number

35

State

United States of America

Pages from

13962

Pages to

13969

Pages count

8

URL

https://pubs.acs.org/doi/abs/10.1021/jacs.9b07083

BibTex

@article{BUT158988,
  author="Kathrin {Kratzl} and Tim {Kratky} and Sebastian {Günther} and Ondřej {Tomanec} and Radek {Zbořil} and Jan {Michalička} and Jan {Macák} and Mirza {Cokoja} and Roland A. {Fischer}",
  title="Generation and Stabilization of Small Platinum Clusters Pt12±x Inside a Metal−Organic Framework",
  journal="JOURNAL OF THE AMERICAN CHEMICAL SOCIETY",
  year="2019",
  volume="141",
  number="35",
  pages="13962--13969",
  doi="10.1021/jacs.9b07083",
  issn="0002-7863",
  url="https://pubs.acs.org/doi/abs/10.1021/jacs.9b07083"
}