Raman evaluation of the proton diffusion coefficient in the pressure protonated perovskite electrolytes

Aneta Slodczyk 1,2Oumaya Zaafrani 1Denis Baron 1Philippe Colomban 1

1. Lab Dynamique Interaction et Reactivite, CNRS and Univ Paris VI (LADIR), 2 rue Henry Dunant, Thiais 94320, France
2. AREVA NP, Centre Technique, Chalon sur Saone 71328, France

Abstract

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

 

Related papers
  1. Proton diffusion in perovskites by Elastic and Quasi-Elastic Neutron Scattering measurement
  2. High pressure phase transitions in proton-conductor SrZrO3–based perovskites
  3. Raman intensity : an important tool in the study of nanomaterials and nanostructures

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