Skip to main content
placeholder image

A new in situ strategy to eliminate partial internal short circuit in Ce0.8Sm0.2O1.9-based solid oxide fuel cells

Journal Article


Abstract


  • Partial internal short circuit resulting from the Ce4+/Ce3+ redox reaction is currently one of the most critical

    issues that hinder the practical application of solid oxide fuel cells (SOFCs) with doped ceria electrolytes. In

    this work, a new strategy utilizing a Sr diffusion induced in situ solid-state reaction to generate a blocking

    layer to prevent Ce0.8Sm0.2O1.9 (SDC) from reduction is proposed for the first time. As a proof of concept,

    Ni-SrCe0.95Yb0.05O3d is deployed as a Sr source for the electron-blocking interlayer and was evaluated as

    an anode for SDC-based SOFCs. A thin interlayer composed of SrCe1x(Sm,Yb)xO3d and SDC is formed in

    situ during the sintering process of the half cell due to the interdiffusion of metal cations, and the interlayer

    thickness is highly dependent on the sintering temperature. The high-resolution TEM results indicate that

    the SrCe1x(Sm,Yb)xO3d perovskite phase is generated and coated on the SDC grains, forming an

    SDC@SrCe1x(Sm,Yb)xO3d core–shell structure. The SrCe1x(Sm,Yb)xO3d phase effectively suppresses

    the Ce4+/Ce3+ redox reaction and hence eliminates electronic conduction through the electrolyte

    membrane. Consequently, the OCVs of the fuel cell are significantly improved after incorporating the

    electron-blocking interlayer and increase with increasing the interlayer thickness. The OCVs of the cell

    sintered at 1250 C reach 0.962, 0.989, 1.017, and 1.039 V at 650, 600, 550, and 500 C, respectively.

    The present results demonstrate that Ni-SrCeO3-based composites are promising alternative anodes for

    CeO2-based SOFCs towards enhanced working efficiency at high operating voltages.

Authors


  •   Gong, Zheng (external author)
  •   Sun, Wenping
  •   Cao, Jiafeng (external author)
  •   Wu, Yusen (external author)
  •   Miao, Lina (external author)
  •   Liu, Wei (external author)

Publication Date


  • 2017

Citation


  • Gong, Z., Sun, W., Cao, J., Wu, Y., Miao, L. & Liu, W. (2017). A new in situ strategy to eliminate partial internal short circuit in Ce0.8Sm0.2O1.9-based solid oxide fuel cells. Journal of Materials Chemistry A, 5 (25), 12873-12878.

Scopus Eid


  • 2-s2.0-85021664192

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2601

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 12873

End Page


  • 12878

Volume


  • 5

Issue


  • 25

Place Of Publication


  • United Kingdom

Abstract


  • Partial internal short circuit resulting from the Ce4+/Ce3+ redox reaction is currently one of the most critical

    issues that hinder the practical application of solid oxide fuel cells (SOFCs) with doped ceria electrolytes. In

    this work, a new strategy utilizing a Sr diffusion induced in situ solid-state reaction to generate a blocking

    layer to prevent Ce0.8Sm0.2O1.9 (SDC) from reduction is proposed for the first time. As a proof of concept,

    Ni-SrCe0.95Yb0.05O3d is deployed as a Sr source for the electron-blocking interlayer and was evaluated as

    an anode for SDC-based SOFCs. A thin interlayer composed of SrCe1x(Sm,Yb)xO3d and SDC is formed in

    situ during the sintering process of the half cell due to the interdiffusion of metal cations, and the interlayer

    thickness is highly dependent on the sintering temperature. The high-resolution TEM results indicate that

    the SrCe1x(Sm,Yb)xO3d perovskite phase is generated and coated on the SDC grains, forming an

    SDC@SrCe1x(Sm,Yb)xO3d core–shell structure. The SrCe1x(Sm,Yb)xO3d phase effectively suppresses

    the Ce4+/Ce3+ redox reaction and hence eliminates electronic conduction through the electrolyte

    membrane. Consequently, the OCVs of the fuel cell are significantly improved after incorporating the

    electron-blocking interlayer and increase with increasing the interlayer thickness. The OCVs of the cell

    sintered at 1250 C reach 0.962, 0.989, 1.017, and 1.039 V at 650, 600, 550, and 500 C, respectively.

    The present results demonstrate that Ni-SrCeO3-based composites are promising alternative anodes for

    CeO2-based SOFCs towards enhanced working efficiency at high operating voltages.

Authors


  •   Gong, Zheng (external author)
  •   Sun, Wenping
  •   Cao, Jiafeng (external author)
  •   Wu, Yusen (external author)
  •   Miao, Lina (external author)
  •   Liu, Wei (external author)

Publication Date


  • 2017

Citation


  • Gong, Z., Sun, W., Cao, J., Wu, Y., Miao, L. & Liu, W. (2017). A new in situ strategy to eliminate partial internal short circuit in Ce0.8Sm0.2O1.9-based solid oxide fuel cells. Journal of Materials Chemistry A, 5 (25), 12873-12878.

Scopus Eid


  • 2-s2.0-85021664192

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2601

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 12873

End Page


  • 12878

Volume


  • 5

Issue


  • 25

Place Of Publication


  • United Kingdom