Raman evaluation of the proton diffusion coefficient in the pressure protonated perovskite electrolytes
|Aneta Slodczyk 1,2, Oumaya Zaafrani 1, Denis Baron 1, Philippe Colomban 1|
1. Lab Dynamique Interaction et Reactivite, CNRS and Univ Paris VI (LADIR), 2 rue Henry Dunant, Thiais 94320, France
The design of electrolyser for working under moderate water pressure1 offers new impetus in the study of perovskite ceramics as membranes of the green house gas free devices such as the fuel cells and water electrolysers. We have recently pointed out that the protonation process of perovskite ceramic performed in the autoclave (high temperature, high pressure of H2O) gives rise to a broad “Raman” component, centred at ~2500cm-1 correlated to the protonic species content and the conductivity of a material2. The so-called Raman profilometry method which permits to map and control the homogeneity of the proton distribution on ceramic section is discussed. The Raman intensity distribution profile is fitted according to Fick’s diffusion laws in order to compare the proton diffusion coefficient at various temperatures and water pressure for different perovskites ((Ba/Sr)(Zr/Ti)O3).
1. PCT patent WO 2008/152317 A2 (18-12-2008), Method for optimising the conductivity provided by the displacement of H+ protons and/or OH- ions in a conductive membrane.
2. A. Slodczyk, Ph. Colomban, S. Willemin, O. Lacroix, B. Sala, Indirect Raman identification of the proton insertion in the high-temperature [BA/Sr][Zr/Ti]O3 modified perovskite protonic conductor, J. Raman Spectroscopy, 39 (2008) DOI 10.1002/jrs.2157
Presentation: Oral at E-MRS Fall Meeting 2009, Symposium G, by Oumaya Zaafrani
See On-line Journal of E-MRS Fall Meeting 2009
Submitted: 2009-05-11 11:50 Revised: 2009-06-07 00:48