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Graphene/Zirconia Composites for Components in Solid Oxide Fuel Cells: Microstructure and Electrical Conductivity.

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Title: Graphene/Zirconia Composites for Components in Solid Oxide Fuel Cells: Microstructure and Electrical Conductivity.
Authors: Coto-Ruiz, Francisco J.1,2 (AUTHOR), de la Cruz-Blanco, Ana1,2 (AUTHOR), Moriche, Rocío1,2 (AUTHOR), Morales-Rodríguez, Ana2 (AUTHOR), Poyato, Rosalía1 (AUTHOR) rosalia.poyato@icmse.csic.es
Source: Nanomaterials (2079-4991). Sep2025, Vol. 15 Issue 17, p1314. 17p.
Subjects: Graphene, Solid oxide fuel cells, Impedance spectroscopy, Electric conductivity, Sintering, Microstructure, Composite materials, Zirconium oxide
Abstract: In this paper, 8 mol% yttria cubic stabilized zirconia (8YCSZ) composites with reduced graphene oxide (rGO) contents up to 10 vol% were consolidated by spark plasma sintering (SPS) at two different temperatures with the aim of evaluating the relationship of their electrical properties with the graphene content, the rGO crystallinity, and the microstructural features. Successful in situ reduction of GO was accomplished during SPS, and highly densified composites with homogeneous rGO distribution, even at the highest contents, were obtained. The electrical properties were analyzed using impedance spectroscopy. Measurements were taken up to 700 °C, revealing an inductive response for the composites with 5 and 10 vol% rGO and a capacitive response for the composites with 1 and 2.5 vol% rGO. The results indicate that, along with the ionic conduction typical of zirconia, there are additional polarization mechanisms associated with the presence of graphene at ceramic grain boundaries that substantially modify the impedance response. A minor electronic conductivity contribution was identified in the composites below the percolation threshold. These characteristics make the 8YCSZ composites promising candidates for application as SOFC components, as ceramic interconnects when the graphene content is above the percolation threshold, or as electrolytes when the graphene content is below this limit. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Graphene/Zirconia Composites for Components in Solid Oxide Fuel Cells: Microstructure and Electrical Conductivity.
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  Data: <searchLink fieldCode="AR" term="%22Coto-Ruiz%2C+Francisco+J%2E%22">Coto-Ruiz, Francisco J.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22de+la+Cruz-Blanco%2C+Ana%22">de la Cruz-Blanco, Ana</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Moriche%2C+Rocío%22">Moriche, Rocío</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Morales-Rodríguez%2C+Ana%22">Morales-Rodríguez, Ana</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Poyato%2C+Rosalía%22">Poyato, Rosalía</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rosalia.poyato@icmse.csic.es</i>
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Sep2025, Vol. 15 Issue 17, p1314. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Graphene%22">Graphene</searchLink><br /><searchLink fieldCode="DE" term="%22Solid+oxide+fuel+cells%22">Solid oxide fuel cells</searchLink><br /><searchLink fieldCode="DE" term="%22Impedance+spectroscopy%22">Impedance spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+conductivity%22">Electric conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Composite+materials%22">Composite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Zirconium+oxide%22">Zirconium oxide</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this paper, 8 mol% yttria cubic stabilized zirconia (8YCSZ) composites with reduced graphene oxide (rGO) contents up to 10 vol% were consolidated by spark plasma sintering (SPS) at two different temperatures with the aim of evaluating the relationship of their electrical properties with the graphene content, the rGO crystallinity, and the microstructural features. Successful in situ reduction of GO was accomplished during SPS, and highly densified composites with homogeneous rGO distribution, even at the highest contents, were obtained. The electrical properties were analyzed using impedance spectroscopy. Measurements were taken up to 700 °C, revealing an inductive response for the composites with 5 and 10 vol% rGO and a capacitive response for the composites with 1 and 2.5 vol% rGO. The results indicate that, along with the ionic conduction typical of zirconia, there are additional polarization mechanisms associated with the presence of graphene at ceramic grain boundaries that substantially modify the impedance response. A minor electronic conductivity contribution was identified in the composites below the percolation threshold. These characteristics make the 8YCSZ composites promising candidates for application as SOFC components, as ceramic interconnects when the graphene content is above the percolation threshold, or as electrolytes when the graphene content is below this limit. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.3390/nano15171314
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      – Code: eng
        Text: English
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        PageCount: 17
        StartPage: 1314
    Subjects:
      – SubjectFull: Graphene
        Type: general
      – SubjectFull: Solid oxide fuel cells
        Type: general
      – SubjectFull: Impedance spectroscopy
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      – SubjectFull: Electric conductivity
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      – SubjectFull: Sintering
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      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Composite materials
        Type: general
      – SubjectFull: Zirconium oxide
        Type: general
    Titles:
      – TitleFull: Graphene/Zirconia Composites for Components in Solid Oxide Fuel Cells: Microstructure and Electrical Conductivity.
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            NameFull: Coto-Ruiz, Francisco J.
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            NameFull: de la Cruz-Blanco, Ana
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            NameFull: Moriche, Rocío
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            NameFull: Morales-Rodríguez, Ana
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            NameFull: Poyato, Rosalía
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            – D: 01
              M: 09
              Text: Sep2025
              Type: published
              Y: 2025
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