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Steam Electrolysis vs. Co-Electrolysis: Mechanistic Studies of Long-Term Solid Oxide Electrolysis Cells

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  • Stephanie E. Wolf

    (Institute of Energy and Climate Research, Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
    Institute of Physical Chemistry, RWTH Aachen University, 52074 Aachen, Germany)

  • Vaibhav Vibhu

    (Institute of Energy and Climate Research, Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany)

  • Eric Tröster

    (Institute of Energy and Climate Research, Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany)

  • Izaak C. Vinke

    (Institute of Energy and Climate Research, Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany)

  • Rüdiger-A. Eichel

    (Institute of Energy and Climate Research, Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
    Institute of Physical Chemistry, RWTH Aachen University, 52074 Aachen, Germany)

  • L. G. J. (Bert) de Haart

    (Institute of Energy and Climate Research, Fundamental Electrochemistry (IEK-9), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany)

Abstract

High-temperature electrolysis using solid oxide electrolysis cells (SOECs) is an innovative technology to temporarily store unused electrical energy from renewable energy sources. However, they show continuous performance loss during long-term operation, which is the main issue preventing their widespread use. In this work, we have performed the long-term stability tests up to 1000 h under steam and co-electrolysis conditions using commercial NiO-YSZ/YSZ/GDC/LSC single cells in order to understand the degradation process. The electrolysis tests were carried out at different temperatures and fuel gas compositions. Intermittent AC- and DC- measurements were performed to characterize the single cells and to determine the responsible electrode processes for the degradation during long-term operation. An increased degradation rate is observed at 800 °C compared to 750 °C under steam electrolysis conditions. Moreover, a lower degradation rate is noticed under co-electrolysis operation in comparison to steam electrolysis operation. Finally, the post-test analyses using SEM-EDX and XRD were carried out in order to understand the degradation mechanism. The delamination of LSC is observed under steam electrolysis conditions at 800 °C, however, such delamination is not observed during co-electrolysis operation. In addition, Ni-depletion and agglomeration are observed on the fuel electrode side for all the cells.

Suggested Citation

  • Stephanie E. Wolf & Vaibhav Vibhu & Eric Tröster & Izaak C. Vinke & Rüdiger-A. Eichel & L. G. J. (Bert) de Haart, 2022. "Steam Electrolysis vs. Co-Electrolysis: Mechanistic Studies of Long-Term Solid Oxide Electrolysis Cells," Energies, MDPI, vol. 15(15), pages 1-17, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5449-:d:873542
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    References listed on IDEAS

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    1. Vaibhav Vibhu & Izaak C. Vinke & Fotios Zaravelis & Stylianos G. Neophytides & Dimitrios K. Niakolas & Rüdiger-A. Eichel & L. G. J. (Bert) de Haart, 2022. "Performance and Degradation of Electrolyte-Supported Single Cell Composed of Mo-Au-Ni/GDC Fuel Electrode and LSCF Oxygen Electrode during High Temperature Steam Electrolysis," Energies, MDPI, vol. 15(8), pages 1-11, April.
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    Cited by:

    1. Jiming Yuan & Zeming Li & Benfeng Yuan & Guoping Xiao & Tao Li & Jian-Qiang Wang, 2023. "Optimization of High-Temperature Electrolysis System for Hydrogen Production Considering High-Temperature Degradation," Energies, MDPI, vol. 16(6), pages 1-18, March.
    2. Mohsen Fallah Vostakola & Hasan Ozcan & Rami S. El-Emam & Bahman Amini Horri, 2023. "Recent Advances in High-Temperature Steam Electrolysis with Solid Oxide Electrolysers for Green Hydrogen Production," Energies, MDPI, vol. 16(8), pages 1-50, April.

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