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Title: Proton conductivity of potassium doped barium zirconates

Abstract

Potassium doped barium zirconates have been synthesized by solid state reactions. It was found that the solubility limit of potassium on A-sites is between 5% and 10%. Introducing extra potassium leads to the formation of second phase or YSZ impurities. The water uptake of barium zirconates was increased even with 5% doping of potassium at the A-site. The sintering conditions and conductivity can be improved significantly by adding 1 wt% ZnO during material synthesis. The maximum solubility for yttrium at B-sites is around 15 at% after introducing 1 wt% zinc. The conductivity of Ba{sub 0.95}K{sub 0.05}Zr{sub 0.85}Y{sub 0.11}Zn{sub 0.04}O{sub 3-{delta}} at 600 deg. C is 2.2x10{sup -3} S/cm in wet 5% H{sub 2}. The activation energies for bulk and grain boundary are 0.29(2), 0.79(2) eV in wet 5% H{sub 2} and 0.31(1), 0.74(3) eV in dry 5% H{sub 2}. A power density of 7.7 mW/cm{sup 2} at 718 deg. C was observed when a 1 mm thick Ba{sub 0.95}K{sub 0.05}Zr{sub 0.85}Y{sub 0.11}Zn{sub 0.04}O{sub 3-{delta}} pellet was used as electrolyte and platinum electrodes. - Graphical abstract: Potassium doped barium zirconates have been synthesized by solid state reactions. It was found that the solubility limit of potassium on A-sites is between 5%more » and 10 %. The sintering conditions and conductivity can be improved significantly by adding 1 wt% ZnO during material synthesis. Five percent doping of potassium at A-site can double the total conductivity.« less

Authors:
 [1];  [1]
  1. School of Chemistry, University of St. Andrews, Fife KY16 9ST (United Kingdom)
Publication Date:
OSTI Identifier:
21372453
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 183; Journal Issue: 1; Other Information: DOI: 10.1016/j.jssc.2009.10.017; PII: S0022-4596(09)00501-5; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; BARIUM COMPOUNDS; DOPED MATERIALS; FUEL CELLS; GRAIN BOUNDARIES; HYDROGEN; PLATINUM; POTASSIUM COMPOUNDS; PROTON CONDUCTIVITY; SINTERING; SOLUBILITY; SYNTHESIS; ZINC OXIDES; ZIRCONATES; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; DIRECT ENERGY CONVERTERS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELECTROCHEMICAL CELLS; ELEMENTS; ENERGY; FABRICATION; IONIC CONDUCTIVITY; MATERIALS; METALS; MICROSTRUCTURE; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; PLATINUM METALS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; ZINC COMPOUNDS; ZIRCONIUM COMPOUNDS

Citation Formats

Xiaoxiang, Xu, Tao Shanwen, E-mail: s.tao@hw.ac.u, Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, and Irvine, John T.S. Proton conductivity of potassium doped barium zirconates. United States: N. p., 2010. Web.
Xiaoxiang, Xu, Tao Shanwen, E-mail: s.tao@hw.ac.u, Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, & Irvine, John T.S. Proton conductivity of potassium doped barium zirconates. United States.
Xiaoxiang, Xu, Tao Shanwen, E-mail: s.tao@hw.ac.u, Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, and Irvine, John T.S. 2010. "Proton conductivity of potassium doped barium zirconates". United States.
@article{osti_21372453,
title = {Proton conductivity of potassium doped barium zirconates},
author = {Xiaoxiang, Xu and Tao Shanwen, E-mail: s.tao@hw.ac.u and Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS and Irvine, John T.S.},
abstractNote = {Potassium doped barium zirconates have been synthesized by solid state reactions. It was found that the solubility limit of potassium on A-sites is between 5% and 10%. Introducing extra potassium leads to the formation of second phase or YSZ impurities. The water uptake of barium zirconates was increased even with 5% doping of potassium at the A-site. The sintering conditions and conductivity can be improved significantly by adding 1 wt% ZnO during material synthesis. The maximum solubility for yttrium at B-sites is around 15 at% after introducing 1 wt% zinc. The conductivity of Ba{sub 0.95}K{sub 0.05}Zr{sub 0.85}Y{sub 0.11}Zn{sub 0.04}O{sub 3-{delta}} at 600 deg. C is 2.2x10{sup -3} S/cm in wet 5% H{sub 2}. The activation energies for bulk and grain boundary are 0.29(2), 0.79(2) eV in wet 5% H{sub 2} and 0.31(1), 0.74(3) eV in dry 5% H{sub 2}. A power density of 7.7 mW/cm{sup 2} at 718 deg. C was observed when a 1 mm thick Ba{sub 0.95}K{sub 0.05}Zr{sub 0.85}Y{sub 0.11}Zn{sub 0.04}O{sub 3-{delta}} pellet was used as electrolyte and platinum electrodes. - Graphical abstract: Potassium doped barium zirconates have been synthesized by solid state reactions. It was found that the solubility limit of potassium on A-sites is between 5% and 10 %. The sintering conditions and conductivity can be improved significantly by adding 1 wt% ZnO during material synthesis. Five percent doping of potassium at A-site can double the total conductivity.},
doi = {},
url = {https://www.osti.gov/biblio/21372453}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 1,
volume = 183,
place = {United States},
year = {Fri Jan 15 00:00:00 EST 2010},
month = {Fri Jan 15 00:00:00 EST 2010}
}