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

Author:

Galkina Irina1ORCID,Faid Alaa Y.2,Jiang Wulyu1,Scheepers Fabian1,Borowski Patrick3,Sunde Svein2,Shviro Meital14,Lehnert Werner15,Mechler Anna K.678

Affiliation:

1. Forschungszentrum Jülich GmbH Institute of Energy and Climate Research Electrochemical Process Engineering (IEK‐14) 52425 Jülich Germany

2. Department of Materials Science and Engineering Norwegian University of Science and Technology Trondheim 7491 Norway

3. Evonik Operations GmbH 45772 Marl Germany

4. Chemistry and Nanoscience Center National Renewable Energy Laboratory (NREL) Golden CO 80401 USA

5. RWTH Aachen University Faculty of Mechanical Engineering Modeling in Electrochemical Process Engineering 52056 Aachen Germany

6. RWTH Aachen University Electrochemical Reaction Engineering (AVT.ERT) 52056 Aachen Germany

7. Forschungszentrum Jülich GmbH Institute of Energy and Climate Research Fundamentals of Electrochemistry (IEK‐9) 52425 Jülich Germany

8. JARA‐ENERGY 52056 Aachen Germany

Abstract

AbstractAnion 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.

Funder

Fuel Cells and Hydrogen Joint Undertaking

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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