Journal Article

FZJ-2023-01720

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Core‐passivation: A concept for stable core‐shell nanoparticles in aqueous electrocatalysis

Göhl, D. (Corresponding author)Extern* ; Paciok, P. (Corresponding author)FZJ* ; Wang, Z.Extern* ; Kang, J. S.Extern* ; Heggen, M.FZJ* ; Mayrhofer, K.FZJ* ; Román-Leshkov, Y.Extern* ; Ledendecker, M. (Corresponding author)FZJ*

2023
Wiley-VCH Weinheim, Germany

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Please use a persistent id in citations: http://hdl.handle.net/2128/34334  doi:10.1002/nano.202200240

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

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 5351 - Platform for Correlative, In Situ and Operando Characterization (POF4-535) (POF4-535)
2. POREForm - Entwicklung von porenoptimierten Katalysatoren u. Katalysatorschichten f. Hochleistungs-Polmer-Elektrolyt-Membran- Brennstoffzellen -- Höchstauflösende elektronenmikroskopische Charakterisierung der Porenstruktur u. Katalysator-Ionomer Grenzflächen (DFG-100455697) (DFG-100455697)

Appears in the scientific report 2023

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