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Issue 7, 2016
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Effect of tri- and tetravalent metal doping on the electrochemical properties of lanthanum tungstate proton conductors

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Abstract

Rare-earth tungstates (La28−yW4+yO54+δ2−δ) have attracted attention recently because of their relatively high proton-electron conductivity and high stability in a CO2 environment. Since doping on the tungsten-site may increase the conductivity, a new series of compounds with composition La5.5W1−xMxO11.25−δ (M = Al, Ti and Zr; x = 0, 0.05 and 0.10) have been investigated. The crystal structure of these materials has been studied using X-ray and time-of-flight neutron powder diffraction by Rietveld analysis. The concentration of oxygen vacancies for hydration in the structure has been indirectly determined by thermogravimetric analysis, and the total conductivity in several pO2, pH2O and pD2O atmospheres has been studied by impedance spectroscopy. An increase in the conductivity is observed, ranging from 4.1 mS cm−1 for the undoped sample to 9.2 mS cm−1 for La5.5W0.9Ti0.1O11.25−δ, in wet N2 at 800 °C.

Graphical abstract: Effect of tri- and tetravalent metal doping on the electrochemical properties of lanthanum tungstate proton conductors

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Supplementary files

Article information


Submitted
01 Oct 2015
Accepted
11 Jan 2016
First published
11 Jan 2016

Dalton Trans., 2016,45, 3130-3138
Article type
Paper
Author version available

Effect of tri- and tetravalent metal doping on the electrochemical properties of lanthanum tungstate proton conductors

J. M. Porras-Vázquez, L. dos Santos-Gómez, D. Marrero-López, P. R. Slater, N. Masó, A. Magrasó and E. R. Losilla, Dalton Trans., 2016, 45, 3130
DOI: 10.1039/C5DT03833B

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