Mudenda, S and Kale, GM orcid.org/0000-0002-3021-5905 (2017) Electrochemical determination of activity of Na2O in Na2Ti6O13-TiO2 two phase system between 803–1000 K. Electrochimica Acta, 258. pp. 1059-1063. ISSN 0013-4686
Abstract
Sodium oxide (Na 2 O) activity in NT6-TiO 2 was measured using the EMF method with test electrode Pt,Na 2 Ti 6 O 13 +TiO 2 (NT6-TiO 2 ). NASICON (Na 2 Zr 2 Si 2 PO 12 ) was used as the solid electrolyte in conjunction with a biphasic mixture of alpha alumina (α-Al 2 O 3 ) and sodium beta alumina (Na 2 O.x Al 2 O 3 (8.5≤x < 11)) as the reference electrode and measurements taken over the temperature range of 803≤T≤1000 K. Internal consistency of the cell was ensured by approaching the equilibration target temperature from both sides, during cooling and heating. EMF measurements showed linear dependency with temperature in the temperature range under study. The activity of Na 2 O in NT6-TiO 2 in the temperature range under study was determined. This was found to be loga Na 2 O(NT6−TiO 2 ) =1.20−[Formula presented]. This data is important in the determination of theoretical EMF for the calibration electrochemical sensors employing NT6-TiO 2 electrode. Furthermore, it was found that, a Na 2 O(NT6−TiO 2 ) > a Na 2 O(NASICON) indicating chemical stability when in contact with NASICON at higher temperatures.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 Elsevier Ltd. All rights reserved. This is an author produced version of a paper published in Electrochimica Acta. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | NT6-TiO2; Na2Ti6O13 + TiO2; EMF method; Thermodynamics; Thermodynamic stability; NT6; NASICON; Sodium beta alumina; Sodium beta alumina |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 30 Jan 2018 14:57 |
Last Modified: | 23 Nov 2018 01:38 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.electacta.2017.11.158 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:126764 |