Core‐passivation: A concept for stable core‐shell nanoparticles in aqueous electrocatalysis

Author:

Göhl Daniel1,Paciok Paul2,Wang Zhenshu3,Kang Jin Soo3,Heggen Marc2,Mayrhofer Karl J. J.45,Román‐Leshkov Yuriy3,Ledendecker Marc16

Affiliation:

1. Department of Chemistry Ernst‐Berl‐Institut für Technische und Makromolekulare Chemie Technical University of Darmstadt Darmstadt Germany

2. Ernst Ruska‐Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute Forschungszentrum Jülich GmbH Jülich Germany

3. Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA

4. Helmholtz‐Institute Erlangen‐Nürnberg for Renewable Energy Forschungszentrum Jülich GmbH Erlangen Germany

5. Department of Chemical and Biological Engineering Friedrich‐Alexander‐Universität Erlangen‐Nürnberg Erlangen Germany

6. Professorship Sustainable Energy Materials Technical University Munich Straubing Germany

Abstract

AbstractThe 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.

Funder

Bundesministerium für Bildung und Forschung

Publisher

Wiley

Subject

General Medicine

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