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Synthesis, structure and electrical conductivity of a new perovskite type barium cobaltate BaCoO1.80(OH)0.86

Waidha, Aamir Iqbal and Lepple, Maren and Wissel, Kerstin and Benes, Alexander and Wollstadt, Stephan and Slater, Peter R. and Fortes, A. D. and Clemens, Oliver (2018):
Synthesis, structure and electrical conductivity of a new perovskite type barium cobaltate BaCoO1.80(OH)0.86.
In: Dalton Transactions, Royal Society of Chemistry, pp. 11136-11145, 47, (32), ISSN 1477-9226,
DOI: 10.1039/C8DT01326H,
[Online-Edition: https://doi.org/10.1039/C8DT01326H],
[Article]

Abstract

Perovskite oxides exhibiting mixed protonic and electronic conductivities have interesting applications in protonic ceramic fuel cells. In this work, we report on a hydrated phase of BaCoO1.80(OH)0.86 synthesized using nebulized spray pyrolysis. Structural analysis based on X-ray and neutron powder diffraction data showed that the compound is isotypic to BaFeO2.33(OH)0.33. The water loss behaviour was studied using simultaneous thermal analysis and high temperature X-ray diffraction, indicating that protons (respectively water) can be stabilized within the compound up to temperatures significantly above 673 K, confirmed by ex situ Fourier transform infrared spectroscopy studies. Impedance spectroscopy was used to determine the conductivity characteristics of BaCoO1.80(OH)0.86, finding and a total electrical conductivity in the order of 10−4 S cm−1 at ambient temperature with an activation energy of 0.28 eV.

Item Type: Article
Erschienen: 2018
Creators: Waidha, Aamir Iqbal and Lepple, Maren and Wissel, Kerstin and Benes, Alexander and Wollstadt, Stephan and Slater, Peter R. and Fortes, A. D. and Clemens, Oliver
Title: Synthesis, structure and electrical conductivity of a new perovskite type barium cobaltate BaCoO1.80(OH)0.86
Language: English
Abstract:

Perovskite oxides exhibiting mixed protonic and electronic conductivities have interesting applications in protonic ceramic fuel cells. In this work, we report on a hydrated phase of BaCoO1.80(OH)0.86 synthesized using nebulized spray pyrolysis. Structural analysis based on X-ray and neutron powder diffraction data showed that the compound is isotypic to BaFeO2.33(OH)0.33. The water loss behaviour was studied using simultaneous thermal analysis and high temperature X-ray diffraction, indicating that protons (respectively water) can be stabilized within the compound up to temperatures significantly above 673 K, confirmed by ex situ Fourier transform infrared spectroscopy studies. Impedance spectroscopy was used to determine the conductivity characteristics of BaCoO1.80(OH)0.86, finding and a total electrical conductivity in the order of 10−4 S cm−1 at ambient temperature with an activation energy of 0.28 eV.

Journal or Publication Title: Dalton Transactions
Volume: 47
Number: 32
Publisher: Royal Society of Chemistry
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
Date Deposited: 11 Dec 2018 14:24
DOI: 10.1039/C8DT01326H
Official URL: https://doi.org/10.1039/C8DT01326H
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