Issue 13, 2022

Remarkable stability of a molecular ruthenium complex in PEM water electrolysis

Abstract

The dinuclear Ru diazadiene olefin complex, [Ru2(OTf)(μ-H)(Me2dad)(dbcot)2], is an active catalyst for hydrogen evolution in a Polymer Exchange Membrane (PEM) water electrolyser. When supported on high surface area carbon black and at 80 °C, [Ru2(OTf)(μ-H)(Me2dad)(dbcot)2]@C evolves hydrogen at the cathode of a PEM electrolysis cell (400 mA cm−2, 1.9 V). A remarkable turn over frequency (TOF) of 7800 molH2 molcatalyst−1 h−1 is maintained over 7 days of operation. A series of model reactions in homogeneous media and in electrochemical half cells, combined with DFT calculations, are used to rationalize the hydrogen evolution mechanism promoted by [Ru2(OTf)(μ-H)(Me2dad)(dbcot)2].

Graphical abstract: Remarkable stability of a molecular ruthenium complex in PEM water electrolysis

Supplementary files

Article information

Article type
Edge Article
Submitted
28 Dec 2021
Accepted
03 Mar 2022
First published
03 Mar 2022
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2022,13, 3748-3760

Remarkable stability of a molecular ruthenium complex in PEM water electrolysis

M. Bellini, J. Bösken, M. Wörle, D. Thöny, J. J. Gamboa-Carballo, F. Krumeich, F. Bàrtoli, H. A. Miller, L. Poggini, W. Oberhauser, A. Lavacchi, H. Grützmacher and F. Vizza, Chem. Sci., 2022, 13, 3748 DOI: 10.1039/D1SC07234J

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