Proton conductivity and stability of Ba2In2O5 in hydrogen containing atmospheres

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Journal titleJournal of The Electrochemical Society
Subjectproton conductive ceramics; intermediate temperature; fuel cell; Ba2In2O5
AbstractBa₂In₂O₅ 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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AffiliationNRC Institute for Fuel Cell Innovation; National Research Council Canada
Peer reviewedYes
NPARC number16869222
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Record identifierd95f9ad6-2651-415c-af6b-2cc577630a5b
Record created2011-02-15
Record modified2016-05-09
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