Improved oxygen surface exchange kinetics at grain boundaries in nanocrystalline yttria-stabilized zirconia

Joong Sun Park; Timothy P. Holme; Joon Hyung Shim; Fritz B. Prinz

doi:10.1557/mrc.2012.18

Improved oxygen surface exchange kinetics at grain boundaries in nanocrystalline yttria-stabilized zirconia

Joong Sun Park, Timothy P. Holme, Joon Hyung Shim, Fritz B. Prinz

Department of Mechanical Engineering

Research output: Contribution to journal › Article

14 Citations (Scopus)

Abstract

Quantum simulations of oxygen incorporation at a Σ5 grain boundary in yttria-stabilized zirconia (YSZ), a common solid oxide fuel cells (SOFCs) electrolyte, show that the incorporation energy is reduced compared with YSZ with no grain boundaries. The simulation results are supported by electrochemical impedance spectroscopy (EIS) measurements conducted on a single crystalline YSZ substrate with nanogranular interlayered YSZ. EIS results showed that single crystalline YSZ membranes with nanogranular surface (i.e., high grain boundary densities) exhibit small electrode impedances than the reference single crystalline YSZ. The 20-nm-thick nanogranular YSZ interlayer was fabricated by atomic layer deposition and the performance for SOFCs with nanograined interlayer was increased by factor of 2 at operating temperatures between 350 and 450 °C.

Original language	English
Pages (from-to)	107-111
Number of pages	5
Journal	MRS Communications
Volume	2
Issue number	3
DOIs	https://doi.org/10.1557/mrc.2012.18
Publication status	Published - 2012

ASJC Scopus subject areas

Materials Science(all)

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10.1557/mrc.2012.18

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Park, J. S., Holme, T. P., Shim, J. H., & Prinz, F. B. (2012). Improved oxygen surface exchange kinetics at grain boundaries in nanocrystalline yttria-stabilized zirconia. MRS Communications, 2(3), 107-111. https://doi.org/10.1557/mrc.2012.18

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abstract = "Quantum simulations of oxygen incorporation at a Σ5 grain boundary in yttria-stabilized zirconia (YSZ), a common solid oxide fuel cells (SOFCs) electrolyte, show that the incorporation energy is reduced compared with YSZ with no grain boundaries. The simulation results are supported by electrochemical impedance spectroscopy (EIS) measurements conducted on a single crystalline YSZ substrate with nanogranular interlayered YSZ. EIS results showed that single crystalline YSZ membranes with nanogranular surface (i.e., high grain boundary densities) exhibit small electrode impedances than the reference single crystalline YSZ. The 20-nm-thick nanogranular YSZ interlayer was fabricated by atomic layer deposition and the performance for SOFCs with nanograined interlayer was increased by factor of 2 at operating temperatures between 350 and 450 °C.",

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