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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

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  • Vaibhav Vibhu

    (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)

  • Fotios Zaravelis

    (Institute of Chemical Engineering Sciences, FORTH/ICE-HT, 26504 Patras, Greece)

  • Stylianos G. Neophytides

    (Institute of Chemical Engineering Sciences, FORTH/ICE-HT, 26504 Patras, Greece)

  • Dimitrios K. Niakolas

    (Institute of Chemical Engineering Sciences, FORTH/ICE-HT, 26504 Patras, Greece)

  • 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

Ni-gadolinia-doped ceria (GDC) based electrode materials have drawn significant attention as an alternative fuel electrode for solid oxide cells (SOCs) owing to mixed ionic conductivity of GDC and high electronic and catalytic activity of Ni. Moreover, the catalytic activity and electrochemical performance of the Ni-GDC electrode can be further improved by dispersing small quantities of other metal additives, such as gold or molybdenum. Therefore, herein, we considered gold and molybdenum modified Ni-GDC electrodes and focused on the upscaling; hence, we prepared 5 × 5 cm 2 electrolyte-supported single cells. Their electrochemical performance was investigated at different temperatures and fuel gas compositions. The long-term steam electrolysis test, up to 1700 h, was performed at 900 °C with −0.3 A·cm −2 current load. Lastly, post-test analyses of measured cells were carried out to investigate their degradation mechanisms. Sr-segregation and cobalt oxide formation towards the oxygen electrode side, and Ni-particle coarsening and depletion away from the electrolyte towards the fuel electrode side, were observed, and can be considered as a main reason for the degradation. Thus, modification of Ni/GDC with Au and Mo seems to significantly improve the electro-catalytic activity of the electrode; however, it does not significantly mitigate the Ni-migration phenomenon after prolonged operation.

Suggested Citation

  • 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.
  • Handle: RePEc:gam:jeners:v:15:y:2022:i:8:p:2726-:d:789247
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    References listed on IDEAS

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    1. Nikolaidis, Pavlos & Poullikkas, Andreas, 2017. "A comparative overview of hydrogen production processes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 67(C), pages 597-611.
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    1. 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.

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