| Download | - View accepted manuscript: Proton conductivity and stability of Ba2In2O5 in hydrogen containing atmospheres (PDF, 920 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1149/1.3511787 |
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| Author | Search for: Jankovic, Jasna1; Search for: Wilkinson, David P.1; Search for: Hui, Rob1 |
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| Affiliation | - National Research Council of Canada. NRC Institute for Fuel Cell Innovation
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| Format | Text, Article |
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| Subject | proton conductive ceramics; intermediate temperature; fuel cell; Ba2In2O5 |
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| Abstract | Ba₂In₂O₅ is one of the oxygen deficient ceramic materials widely investigated for both oxygen ion conduction and proton conduction in oxidizing atmospheres. However, its electrochemical properties have not been studied in hydrogen containing atmospheres. In this work, the electrical conductivity of Ba₂In₂O₅ in hydrogen containing atmospheres was investigated by ac impedance spectroscopy in the temperature range between 100 and 500°C and compared to its conductivity in air and nitrogen in order to estimate the contribution of proton conductivity to the total conductivity. A stable electrical conductivity of over 0.3 S/cm was achieved in the temperature range of 300–480°C in a 50% vol H₂/50% vol N₂ atmosphere. Electromotive force measurements (and complimentary open circuit cell voltage measurements) revealed high proton transport numbers over the temperature range. Ba₂In₂O₅ shows chemical stability in hydrogen containing atmospheres at temperatures up to 480°C, while decomposing at higher temperatures. Mechanical instability was noticed in humid atmospheres at 400°C and above. This previously unreported high conductivity in H₂ atmosphere creates an opportunity for use of Ba₂In₂O₅ as a proton conductive material for a range of intermediate temperature electrochemical devices. |
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| Publication date | 2010-11-19 |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 16869222 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | d95f9ad6-2651-415c-af6b-2cc577630a5b |
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| Record created | 2011-02-15 |
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| Record modified | 2020-04-17 |
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