Ionic Conductivity Increased by Two Orders of Magnitude in Micrometer-Thick Vertical Yttria-Stabilized ZrO2 Nanocomposite Films

Nano Letters
Shinbuhm LeeJudith L MacManus-Driscoll

Abstract

We design and create a unique cell geometry of templated micrometer-thick epitaxial nanocomposite films which contain ~20 nm diameter yttria-stabilized ZrO2 (YSZ) nanocolumns, strain coupled to a SrTiO3 matrix. The ionic conductivity of these nanocolumns is enhanced by over 2 orders of magnitude compared to plain YSZ films. Concomitant with the higher ionic conduction is the finding that the YSZ nanocolumns in the films have much higher crystallinity and orientation, compared to plain YSZ films. Hence, "oxygen migration highways" are formed in the desired out-of-plane direction. This improved structure is shown to originate from the epitaxial coupling of the YSZ nanocolumns to the SrTiO3 film matrix and from nucleation of the YSZ nanocolumns on an intermediate nanocomposite base layer of highly aligned Sm-doped CeO2 nanocolumns within the SrTiO3 matrix. This intermediate layer reduces the lattice mismatch between the YSZ nanocolumns and the substrate. Vertical ionic conduction values as high as 10(-2) Ω(-1) cm(-1) were demonstrated at 360 °C (300 °C lower than plain YSZ films), showing the strong practical potential of these nanostructured films for use in much lower operation temperature ionic devices.

References

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Citations

Jul 12, 2017·ACS Applied Materials & Interfaces·Kelvin H L ZhangMark G Blamire
Aug 19, 2017·Physical Chemistry Chemical Physics : PCCP·Pratik P DholabhaiBlas Pedro Uberuaga
Oct 29, 2018·Advanced Materials·Aiping ChenQuanxi Jia
Jun 18, 2021·Nano-micro Letters·Bowen ZhangJudith L MacManus-Driscoll
May 25, 2018·ACS Combinatorial Science·Ruiyun HuangSossina M Haile
Feb 23, 2019·ACS Applied Materials & Interfaces·Gang ChenKai Yu
Sep 29, 2020·Chemistry of Materials : a Publication of the American Chemical Society·Michael A HopeClare P Grey
Jan 12, 2021·ACS Applied Materials & Interfaces·Matthew P WellsJudith L MacManus-Driscoll
Sep 8, 2017·ACS Applied Materials & Interfaces·Jia-Mian HuLong-Qing Chen

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