Proton Content and Nature in Perovskite Ceramic Membranes for Medium Temperature Fuel Cells and Electrolysers

Membranes

Philippe Colomban¹  Oumaya Zaafrani² 

[1] LADIR, UMR7075 CNRS, Université Pierre et Marie Curie (UPMC); 4 Place Jussieu, Paris 75005, France;

关键词: perovskite;    proton conductor;    ceramic;    membrane;    QNS;    TGA;    IR;    Raman;   

DOI  :  10.3390/membranes2030493

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.