%0 Journal Article
%A Göhl, Daniel
%A Paciok, Paul
%A Wang, Zhenshu
%A Kang, Jin Soo
%A Heggen, Marc
%A Mayrhofer, Karl
%A Román-Leshkov, Yuriy
%A Ledendecker, Marc
%T Core‐passivation: A concept for stable core‐shell nanoparticles in aqueous electrocatalysis
%J Nano select
%V 4
%N 4
%@ 2688-4011
%C Weinheim, Germany
%I Wiley-VCH
%M FZJ-2023-01720
%P  271-277
%D 2023
%X 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
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001176583100006
%R 10.1002/nano.202200240
%U https://juser.fz-juelich.de/record/1006572