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Enhancing grain boundary ionic conductivity in mixed ionic–electronic conductors

Author

Listed:
  • Ye Lin

    (University of South Carolina)

  • Shumin Fang

    (University of South Carolina)

  • Dong Su

    (Center for Functional Nanomaterials, Brookhaven National Laboratory)

  • Kyle S Brinkman

    (Clemson University)

  • Fanglin Chen

    (University of South Carolina)

Abstract

Mixed ionic–electronic conductors are widely used in devices for energy conversion and storage. Grain boundaries in these materials have nanoscale spatial dimensions, which can generate substantial resistance to ionic transport due to dopant segregation. Here, we report the concept of targeted phase formation in a Ce0.8Gd0.2O2−δ–CoFe2O4 composite that serves to enhance the grain boundary ionic conductivity. Using transmission electron microscopy and spectroscopy approaches, we probe the grain boundary charge distribution and chemical environments altered by the phase reaction between the two constituents. The formation of an emergent phase successfully avoids segregation of the Gd dopant and depletion of oxygen vacancies at the Ce0.8Gd0.2O2−δ–Ce0.8Gd0.2O2−δ grain boundary. This results in superior grain boundary ionic conductivity as demonstrated by the enhanced oxygen permeation flux. This work illustrates the control of mesoscale level transport properties in mixed ionic–electronic conductor composites through processing induced modifications of the grain boundary defect distribution.

Suggested Citation

  • Ye Lin & Shumin Fang & Dong Su & Kyle S Brinkman & Fanglin Chen, 2015. "Enhancing grain boundary ionic conductivity in mixed ionic–electronic conductors," Nature Communications, Nature, vol. 6(1), pages 1-9, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7824
    DOI: 10.1038/ncomms7824
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    1. Zhao, Wenjuan & Lin, Bin & Wang, Hao & Wang, Faze & Asghar, Muhammad Imran & Wang, Jun & Zhu, Bin & Lund, Peter, 2024. "A half-metallic heterostructure fuel cell with high performance," Renewable Energy, Elsevier, vol. 232(C).

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