Engineering stable electrocatalysts by synergistic stabilization between carbide cores and Pt shells
Name
02b70b_4a395e9f431f469aa97ef10846bd581a.pdf
Description
Accepted version
Size
1.5 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Göhl, Daniel
Garg, Aaron R.
Paciok, Paul
Mayrhofer, Karl J. J.
Heggen, Marc
Shao-Horn, Yang
Dunin-Borkowski, Rafal E.
Román- Leshkov, Yuriy
Ledendecker, Marc
Date Issued
December 2019
Journal
Nature Catalysis
Publisher
Springer Science and Business Media LLC
Citation
Göhl, Daniel et al. "Engineering stable electrocatalysts by synergistic stabilization between carbide cores and Pt shells." Nature Materials 19, 3 (March 2020): 287–291 © 2020 The Author(s)
Version
Author's final manuscript
Abstract
Core–shell particles with earth-abundant cores represent an effective design strategy for improving the performance of noble metal catalysts, while simultaneously reducing the content of expensive noble metals. However, the structural and catalytic stabilities of these materials often suffer during the harsh conditions encountered in important reactions, such as the oxygen reduction reaction (ORR). Here, we demonstrate that atomically thin Pt shells stabilize titanium tungsten carbide cores, even at highly oxidizing potentials. In situ, time-resolved experiments showed how the Pt coating protects the normally labile core against oxidation and dissolution, and detailed microscopy studies revealed the dynamics of partially and fully coated core–shell nanoparticles during potential cycling. Particles with complete Pt coverage precisely maintained their core–shell structure and atomic composition during accelerated electrochemical ageing studies consisting of over 10,000 potential cycles. The exceptional durability of fully coated materials highlights the potential of core–shell architectures using earth-abundant transition metal carbide (TMC) and nitride (TMN) cores for future catalytic applications.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1038/s41563-019-0555-5
