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Proton Content and Nature in Perovskite Ceramic Membranes for Medium Temperature Fuel Cells and Electrolysers
LADIR, UMR7075 CNRS, Université Pierre et Marie Curie (UPMC), 4 Place Jussieu, Paris 75005, France
* Author to whom correspondence should be addressed.
Received: 28 April 2012; in revised form: 8 June 2012 / Accepted: 28 June 2012 / Published: 25 July 2012
Abstract: Recent interest in environmentally friendly technology has promoted research on green house gas-free devices such as water steam electrolyzers, fuel cells and CO2/syngas converters. In such applications, proton conducting perovskite ceramics appear especially promising as electrolyte membranes. Prior to a successful industrial application, it is necessary to determine/understand their complex physical and chemical behavior, especially that related to proton incorporation mechanism, content and nature of bulk protonic species. Based on the results of quasi-elastic neutron scattering (QNS), thermogravimetric analysis (TGA), Raman and IR measurements we will show the complexity of the protonation process and the importance of differentiation between the protonic species adsorbed on a membrane surface and the bulk protons. The bulk proton content is very low, with a doping limit (~1–5 × 10−3 mole/mole), but sufficient to guarantee proton conduction below 600 °C. The bulk protons posses an ionic, covalent bond free nature and may occupy an interstitial site in the host perovskite structure.
Keywords: perovskite; proton conductor; ceramic; membrane; QNS; TGA; IR; Raman
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Colomban, P.; Zaafrani, O.; Slodczyk, A. Proton Content and Nature in Perovskite Ceramic Membranes for Medium Temperature Fuel Cells and Electrolysers. Membranes 2012, 2, 493-509.
Colomban P, Zaafrani O, Slodczyk A. Proton Content and Nature in Perovskite Ceramic Membranes for Medium Temperature Fuel Cells and Electrolysers. Membranes. 2012; 2(3):493-509.
Colomban, Philippe; Zaafrani, Oumaya; Slodczyk, Aneta. 2012. "Proton Content and Nature in Perovskite Ceramic Membranes for Medium Temperature Fuel Cells and Electrolysers." Membranes 2, no. 3: 493-509.