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- In relation to this article, we declare that there is no conflict of interest.
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Received May 8, 2008
Accepted December 31, 2008
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Preparation of silica-based proton conductors for intermediate temperature fuel cells
Department of Chemical and Biomolecular Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea
Korean Journal of Chemical Engineering, July 2009, 26(4), 1016-1021(6), 10.1007/s11814-009-0169-8
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Abstract
The ternary system SiO2-P2O5-ZrO2 electrolyte and phosphotungstic acid (PWA) doped SiO2-P2O5-ZrO2 electrolyte were prepared for intermediate temperature fuel cell by using sol-gel technique. These silica-based proton conductors were confirmed to be non-crystalline structure without phase separation and good thermal stability by XRD and TG/DTA analysis. The doped PWA was found to be stabilized within the silica matrix and to enhance the proton conductivity. The proton conductivities of SiO2-P2O5-ZrO2 and SiO2-P2O5-ZrO2-PWA electrolytes showed 3.3×10^(-5) and 1.8×10^(-3) S/cm at 90 ℃, respectively, and the cell performance of SiO2-P2O5-ZrO2-PWA electrolyte was obtained as 0.02-0.25 mA/cm2 at 300 ℃ under humid condition.
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