Revealing Sintering Kinetics of MoS2-Supported Metal Nanocatalysts in Atmospheric Gas Environments via Operando Transmission Electron Microscopy
Abstract
The decoration of two-dimensional (2D) substrates with nanoparticles (NPs) serve as heterostructures for various catalysis applications. Deep understanding of catalyst degradation mechanisms during service conditions is crucial to improve the catalyst durability. In this work, we studied the sintering behavior of Pt and bimetallic Au-core Pt-shell (Au@Pt core–shell) NPs on MoS2 supports at high temperatures under vacuum, nitrogen (N2), hydrogen (H2), and air environments by in situ gas-cell transmission electron microscopy (TEM). The key observations are summarized as effect of environment: while particle migration and coalescence (PMC) was the main mechanism that led to Pt and Au@Pt NPs degradation under vacuum, N2, and H2 environments, the degradation of MoS2 substrate was prominent under exposure to air at high temperatures. Pt NPs were less stable in H2 environment when compared with the Pt NPs under vacuum or N2, due to Pt–H interactions that weakened the adhesion of Pt on MoS2. Effect of NP composition: under H2, the stability of Au@Pt NPs was higher in comparison to Pt NPs. This is because H2 promotes the alloying of Pt–Au, thus reducing the number of Pt at the surface (reducing H2 interactions) and increasing Pt atoms in contact with MoS2. Effect of NP size:more »
- Authors:
-
[1];
[2];
[3];
[1];
[2];
[4];
[1]
- Univ. of Illinois, Chicago, IL (United States)
- Univ. of Pittsburgh, PA (United States)
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
- Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
- Sponsoring Org.:
- National Science Foundation (NSF); USDOE Office of Science (SC)
- OSTI Identifier:
- 1632853
- Grant/Contract Number:
- AC02-06CH11357; DMR-1809439; DMR-1809085; DMR-0959470
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Nano
- Additional Journal Information:
- Journal Volume: 14; Journal Issue: 4; Journal ID: ISSN 1936-0851
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 2D materials; gas-cell; in situ TEM; sintering; noble metal catalyst; thermal degradation
Citation Formats
Song, Boao, Yang, Timothy T., Yuan, Yifei, Sharifi-Asl, Soroosh, Cheng, Meng, Saidi, Wissam A., Liu, Yuzi, and Shahbazian-Yassar, Reza. Revealing Sintering Kinetics of MoS2-Supported Metal Nanocatalysts in Atmospheric Gas Environments via Operando Transmission Electron Microscopy. United States: N. p., 2020.
Web. doi:10.1021/acsnano.9b08757.
Song, Boao, Yang, Timothy T., Yuan, Yifei, Sharifi-Asl, Soroosh, Cheng, Meng, Saidi, Wissam A., Liu, Yuzi, & Shahbazian-Yassar, Reza. Revealing Sintering Kinetics of MoS2-Supported Metal Nanocatalysts in Atmospheric Gas Environments via Operando Transmission Electron Microscopy. United States. https://doi.org/10.1021/acsnano.9b08757
Song, Boao, Yang, Timothy T., Yuan, Yifei, Sharifi-Asl, Soroosh, Cheng, Meng, Saidi, Wissam A., Liu, Yuzi, and Shahbazian-Yassar, Reza. Mon .
"Revealing Sintering Kinetics of MoS2-Supported Metal Nanocatalysts in Atmospheric Gas Environments via Operando Transmission Electron Microscopy". United States. https://doi.org/10.1021/acsnano.9b08757. https://www.osti.gov/servlets/purl/1632853.
@article{osti_1632853,
title = {Revealing Sintering Kinetics of MoS2-Supported Metal Nanocatalysts in Atmospheric Gas Environments via Operando Transmission Electron Microscopy},
author = {Song, Boao and Yang, Timothy T. and Yuan, Yifei and Sharifi-Asl, Soroosh and Cheng, Meng and Saidi, Wissam A. and Liu, Yuzi and Shahbazian-Yassar, Reza},
abstractNote = {The decoration of two-dimensional (2D) substrates with nanoparticles (NPs) serve as heterostructures for various catalysis applications. Deep understanding of catalyst degradation mechanisms during service conditions is crucial to improve the catalyst durability. In this work, we studied the sintering behavior of Pt and bimetallic Au-core Pt-shell (Au@Pt core–shell) NPs on MoS2 supports at high temperatures under vacuum, nitrogen (N2), hydrogen (H2), and air environments by in situ gas-cell transmission electron microscopy (TEM). The key observations are summarized as effect of environment: while particle migration and coalescence (PMC) was the main mechanism that led to Pt and Au@Pt NPs degradation under vacuum, N2, and H2 environments, the degradation of MoS2 substrate was prominent under exposure to air at high temperatures. Pt NPs were less stable in H2 environment when compared with the Pt NPs under vacuum or N2, due to Pt–H interactions that weakened the adhesion of Pt on MoS2. Effect of NP composition: under H2, the stability of Au@Pt NPs was higher in comparison to Pt NPs. This is because H2 promotes the alloying of Pt–Au, thus reducing the number of Pt at the surface (reducing H2 interactions) and increasing Pt atoms in contact with MoS2. Effect of NP size: The alloying effect promoted by H2 was more pronounced in small size Au@Pt NPs resulting in their higher sintering resistance in comparison to large size Au@Pt NPs and similar size Pt NPs. The present work provides key insights into the parameters affecting the catalyst degradation mechanisms on 2D supports.},
doi = {10.1021/acsnano.9b08757},
journal = {ACS Nano},
number = 4,
volume = 14,
place = {United States},
year = {Mon Apr 13 00:00:00 EDT 2020},
month = {Mon Apr 13 00:00:00 EDT 2020}
}
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