Stability of Ni–Fe-Layered Double Hydroxide Under Long-Term Operation in AEM Water Electrolysis

Irina Galkina, Alaa Y. Faid, Wulyu Jiang, Fabian Scheepers, Patrick Borowski, Svein Sunde, Meital Shviro, Werner Lehnert, Anna K. Mechler

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Anion exchange membrane water electrolysis (AEMWE) is an attractive method for green hydrogen production. It allows the use of non-platinum group metal catalysts and can achieve performance comparable to proton exchange membrane water electrolyzers due to recent technological advances. While current systems already show high performances with available materials, research gaps remain in understanding electrode durability and degradation behavior. In this study, the performance and degradation tracking of a Ni3Fe–LDH-based single-cell is implemented and investigated through the correlation of electrochemical data using chemical and physical characterization methods. A performance stability of 1000 h, with a degradation rate of 84 µV h−1 at 1 A cm−2 is achieved, presenting the Ni3Fe−LDH-based cell as a stable and cost-attractive AEMWE system. The results show that the conductivity of the formed Ni-Fe-phase is one key to obtaining high electrolyzer performance and that, despite Fe leaching, change in anion-conducting binder compound, and morphological changes inside the catalyst bulk, the Ni3Fe−LDH-based single-cells demonstrate high performance and durability. The work reveals the importance of longer stability tests and presents a holistic approach of electrochemical tracking and post-mortem analysis that offers a guideline for investigating electrode degradation behavior over extended measurement periods.

Original languageEnglish
JournalSmall
Early online date25 Jan 2024
DOIs
StatePublished - Jun 2024
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2024 The Authors. Small published by Wiley-VCH GmbH.

Funding

This project received funding from the Fuel Cells and Hydrogen 2 Joint Undertaking under grant agreement No 875088. This Joint undertaking received support from the European Union's Horizon 2020 research innovation program, as well as Hydrogen Europe and Hydrogen Europe Research. The authors thank Dr. Heinrich Hartmann for conducting the XPS analysis and to Dr. Felix Lohmann‐Richters for his contributions to result‐related discussions. Thanks to the Ernst Ruska‐Centre for Microscopy and Spectroscopy with Electrons (ER‐C) for conducting the fib‐SEM analysis.

FundersFunder number
European Union's Horizon 2020 research innovation program
Hydrogen Europe and Hydrogen Europe Research
Fuel Cells and Hydrogen Joint Undertaking875088

    Keywords

    • NiFe LDH catalysts
    • anion exchange membrane water electrolysis
    • catalyst layers
    • electrode degradation studies
    • electrolyzer durability
    • post-mortem analysis
    • water electrolysis

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