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Title: Modeling the interface of platinum and α-quartz(001): Implications for sintering

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [1];  [3];  [3];  [3];  [4]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  2. BASF Corp., Tarrytown, NY (United States)
  3. BASF SE, Ludwigshafen (Germany)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)

We present a first-principles study which aims to understand the metal–support interaction of platinum nanoparticles on α-quartz(001) and, more generally, silica. The thermodynamic stability of the α-quartz(001) surface and its interface with Pt(111) are investigated as a function of temperature and partial pressure of H2O and O2. Potential defects in the α-quartz(001) surface as well as the adsorption energies of the Pt atom are also studied. This allows us to draw conclusions concerning nanoparticle shape and the resistance toward particle migration based on the interface free energies. We find that, as for the clean α-quartz(001) surface, a dry, reconstructed interface is expected at temperatures that are high but within experimentally relevant ranges. On an ideal, dry, reconstructed surface, particle migration is predicted to be a fast sintering mechanism. On real surfaces, defects may locally prevent reconstruction and act as anchoring points. Finally, the energetics of the adsorption of platinum atoms on α-quartz(001) do not support surface-mediated single-atom migration as a viable path for sintering on the investigated surfaces.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1349408
Journal Information:
Journal of Physical Chemistry. C, Vol. 120, Issue 19; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (5)

Photoswitchable de/adsorption of an azobenzene-derived surfactant on a silica surface journal January 2019
Effects of surface hydroxylation on adhesion at zinc/silica interfaces journal January 2018
Perspective: On the active site model in computational catalyst screening journal January 2017
Structural, electronic and adhesion characteristics of zinc/silica interfaces: ab initio study on zinc/β-cristobalite journal January 2018
Density Functional Theory Study of Water Molecule Adsorption on the α-Quartz (001) Surface with and without the Presence of Na+, Mg2+, and Ca2+ journal July 2019

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