Core‐passivation: A concept for stable core‐shell nanoparticles in aqueous electrocatalysis
Name
Nano Select - 2023 - Göhl - Core‐passivation A concept for stable core‐shell nanoparticles in aqueous electrocatalysis.pdf
Description
Published version
Size
1.2 MB
Format
Adobe PDF
Checksum (MD5)
425beede3c1d638806e608ac02e37a63
Author(s)
Göhl, Daniel
Paciok, Paul
Wang, Zhenshu
Kang, Jin Soo
Heggen, Marc
Mayrhofer, Karl JJ
Román‐Leshkov, Yuriy
Ledendecker, Marc
Date Issued
January 19, 2023
Journal
Nano Select
Publisher
Wiley
Citation
Göhl, Daniel, Paciok, Paul, Wang, Zhenshu, Kang, Jin Soo, Heggen, Marc et al. 2023. "Core‐passivation: A concept for stable core‐shell nanoparticles in aqueous electrocatalysis." Nano Select, 4 (4).
Version
Final published version
Abstract
The stability of nanoparticles is a major challenge in thermal and electrocatalysis. This is especially true for core‐shell nanoparticles where only a few monolayers of noble metal protect the usually non‐noble core material. In this work, we utilize the practical nobility concept to engineer stable core‐shell nanoparticles with a self‐passivating core material. Specifically, tantalum carbide as core material in combination with a 1–3 monolayer thick platinum shell exhibits exceptional stability in aqueous media. The core‐shell catalyst shows no sign of structural changes after 10,000 degradation cycles up to 1.0 VRHE. Due to the efficient passivation of tantalum carbide at the solid/liquid interface, the dissolution reduces by a factor of eight compared to bare Pt. Our findings confirm that passivating core materials are highly beneficial for the stabilization of core‐shell nanomaterials in aqueous media. They open up new ways for the rational design of cost‐efficient but stable non‐noble core – platinum shell nanoparticles where harsh, oxidizing conditions are employed.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1002/nano.202200240
