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Journal Article

Operando Insights on the Degradation Mechanisms of Rhenium doped Molybdenum Disulfide Nanocatalysts for Electrolyzer Applications

MPS-Authors
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Aymerich Armengol,  Raquel
Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Vega Paredes,  Miguel
Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Mingers,  Andrea Maria
Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Efthimiopoulos,  Ilias
Spectroscopy at Electrochemical Interfaces, Project Groups, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Sahu,  Rajib
Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Rabe,  Martin
Spectroscopy at Electrochemical Interfaces, Project Groups, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Scheu,  Christina
Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Zhang,  Siyuan
Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Aymerich Armengol, R., Vega Paredes, M., Mingers, A. M., Camuti, L., Kim, J., Bae, J., et al. (2023). Operando Insights on the Degradation Mechanisms of Rhenium doped Molybdenum Disulfide Nanocatalysts for Electrolyzer Applications. arXiv preprint arXiv:2309.08977.


Cite as: https://hdl.handle.net/21.11116/0000-000D-B9B9-2
Abstract
MoS2 nanostructures are promising catalysts for proton-exchange-membrane (PEM) electrolyzers to replace expensive noble metals. Their broadscale application demands high activity for the hydrogen evolution reaction (HER) as well as good durability. Doping in MoS2 is commonly applied to enhance the HER activity of MoS2-based nanocatalysts, but the effect of dopants in the electrochemical and structural stability is yet to be discussed. Herein, we correlate operando electrochemical measurements to the structural evolution of the materials down to the nanometric scale by identical location electron microscopy and spectroscopy. Different degradation mechanisms at first electrolyte contact, open circuit stabilization and HER conditions are identified for MoS2 nanocatalysts with and without Rhenium doping. Our results demonstrate that doping in MoS2 nanocatalysts can not only improve their HER activity, but also their stability. Doping of MoS2-based nanocatalysts is validated as a promising strategy to follow for the continuous improvement of high performance and durable PEM electrolyzers.