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Issue 7, 2013
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Proton conductivity of columnar ceria thin-films grown by chemical vapor deposition

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Abstract

Columnar thin films of undoped ceria were grown by metal–organic chemical vapor deposition. The films, deposited on Pt-coated MgO(100) substrates, display a columnar microstructure with nanometer scale grain size and ∼30% overall porosity. Through-plane (thickness mode) electrical conductivity was measured by AC impedance spectroscopy. Proton conduction is observed below 350–400 °C, with a magnitude that depends on gas-phase water vapor pressure. The overall behavior suggests proton transport that occurs along exposed grain surfaces and parallel grain boundaries. No impedance due to grain boundaries normal to the direction of transport is observed. The proton conductivity in the temperature range of 200–400 °C is approximately four times greater than that of nanograined bulk ceria, consistent with enhanced transport along aligned grain surfaces in the CVD films.

Graphical abstract: Proton conductivity of columnar ceria thin-films grown by chemical vapor deposition

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Publication details

The article was received on 30 Aug 2012, accepted on 03 Dec 2012 and first published on 03 Dec 2012


Article type: Paper
DOI: 10.1039/C2CP43036C
Citation: Phys. Chem. Chem. Phys., 2013,15, 2466-2472
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    Proton conductivity of columnar ceria thin-films grown by chemical vapor deposition

    T. Oh, D. A. Boyd, D. G. Goodwin and S. M. Haile, Phys. Chem. Chem. Phys., 2013, 15, 2466
    DOI: 10.1039/C2CP43036C

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