Uda, Tetsuya and Boysen, Dane A. and Haile, Sossina M. (2005) Thermodynamic Analysis and Electrochemical Evaluation of CsHSO_4. Solid State Ionics, 176 (1-2). pp. 127-133. ISSN 0167-2738. https://resolver.caltech.edu/CaltechAUTHORS:20131122-145418331
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Abstract
A thermodynamic analysis of CsHSO₄ in oxygen and hydrogen atmospheres has been carried out. In an oxygen atmosphere, the phase relationship for the dehydration of CsHSO₄ as a function of H₂O partial pressure was established. It is concluded that CsHSO₄ is stable in a humidified oxygen atmosphere, pH₂O=0.03 atm, up to 170 °C. However, in hydrogen atmospheres, it was affirmed that CsHSO₄ is reduced to H₂S and Cs₂SO₄. Electromotive force (EMF) measurements in a humidified oxygen concentration cell, pH₂O=0.03 atm confirmed the ionic nature of the charge-carrying species. Upon thermal cycling, the voltage obtained from the high temperature phase (T=149 °C) remained unchanged for over 85 h of measurement. The volume change upon transformation to the superprotonic phase, as directly measured by high temperature X-ray powder diffraction, is +0.54%. These results demonstrate not only the stability of CsHSO₄ in oxygen but also the viability of solid acid-based electrochemical devices that would likely be subjected to thermal cycling during operation.
| Item Type: | Article | |||||||||
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| Alternate Title: | Thermodynamic Analysis and Electrochemical Evaluation of CsHSO4 | |||||||||
| Additional Information: | Copyright © 2004 Elsevier B.V. Received 2 October 2003. Revised 5 April 2004. Accepted 27 April 2004. Available online 22 October 2004. Funding for this work was provided by the Office of Naval Research, Office of Electrochemical Power Science and Technology. | |||||||||
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| Subject Keywords: | Fuel cell; Superprotonic transition; Thermodynamics; Solid acid; Proton conductor | |||||||||
| Issue or Number: | 1-2 | |||||||||
| Classification Code: | PACS: 84.60.Dn(Electrochemical conversion and storage: electrochemical cells and batteries; fuel cells); 66.10.Ed(Ionic conduction); 82.60.Hc(Chemical equilibria and equilibrium constants) | |||||||||
| Record Number: | CaltechAUTHORS:20131122-145418331 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20131122-145418331 | |||||||||
| Official Citation: | Tetsuya Uda, Dane A. Boysen, Sossina M. Haile, Thermodynamic, thermomechanical, and electrochemical evaluation of CsHSO4, Solid State Ionics, Volume 176, Issues 1–2, 14 January 2005, Pages 127-133, ISSN 0167-2738, http://dx.doi.org/10.1016/j.ssi.2004.04.017. (http://www.sciencedirect.com/science/article/pii/S0167273804001833) | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 42665 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Jonathan Gross | |||||||||
| Deposited On: | 27 Nov 2013 21:48 | |||||||||
| Last Modified: | 03 Oct 2019 06:00 |
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