Intermetallic Fe6Ge5 formation and decay of a core–shell structure during the oxygen evolution reaction

J. Niklas Hausmann; Roman A. Khalaniya; Chittaranjan Das; Ina Remy-Speckmann; Stefan Berendts; Andrei V. Shevelkov; Matthias Driess; Prashanth W. Menezes

doi:10.1039/D0CC08035G

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Intermetallic Fe₆Ge₅ formation and decay of a core–shell structure during the oxygen evolution reaction†

J. Niklas Hausmann,^a Roman A. Khalaniya,

^b Chittaranjan Das,

^c Ina Remy-Speckmann,^a Stefan Berendts,^a Andrei V. Shevelkov,^b Matthias Driess

*^a and Prashanth W. Menezes

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, Technische Universität Berlin, Strasse des 17, Juni 135, Sekr. C2, Berlin 10623, Germany
E-mail: matthias.driess@tu-berlin.de, prashanth.menezes@mailbox.tu-berlin.de

^b Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia

^c Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM-ESS), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen D-76344, Germany

Abstract

Herein, we report on intermetallic iron germanide (Fe₆Ge₅) as a novel oxygen evolution reaction (OER) precatalyst with a Tafel slope of 32 mV dec⁻¹ and an overpotential of 272 mV at 100 mA cm⁻² in alkaline media. Furthermore, we uncover the in situ formation of a core–shell like structure that slowly collapses under OER conditions.

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Article information

DOI: https://doi.org/10.1039/D0CC08035G
Article type: Communication
Submitted: 10 Dec 2020
Accepted: 22 Jan 2021
First published: 22 Jan 2021
This article is Open Access

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Chem. Commun., 2021,57, 2184-2187

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Intermetallic Fe₆Ge₅ formation and decay of a core–shell structure during the oxygen evolution reaction

J. N. Hausmann, R. A. Khalaniya, C. Das, I. Remy-Speckmann, S. Berendts, A. V. Shevelkov, M. Driess and P. W. Menezes, Chem. Commun., 2021, 57, 2184 DOI: 10.1039/D0CC08035G

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