Preparation and hydrogen permeation of BaCe0.95Nd0.05O3-δ membranes

verfasst von
Mingya Cai, Song Liu, Konstantin Efimov, Jürgen Caro, Armin Feldhoff, Haihui Wang
Abstract

A mixed proton-electron conducting perovskite made of BaCe0.95Nd0.05O3-δ (BCN) was prepared by EDTA/citric acid complexing method. The precursor was characterized by differential scanning calorimetry (DSC), thermogravimetry (TG), and X-ray diffraction (XRD). In order to learn the perovskite formation process during the calcination, the intermediate, i.e. the sample calcined at 750 °C for 5 h, was investigated by scanning (STEM), energy-filtered (EFTEM), and high-resolution transmission electron microscopy (HRTEM) as well as electron energy-loss spectroscopy (EELS). The results revealed that the perovskite structure was formed via a solid-state reaction between barium-cerium mixed carbonate and cerium-neodymium mixed oxide particles. Dense mixed proton-electron conducting BCN membranes were made by pressing BCN powder followed by sintering. The microstructure of the sintered membranes was investigated by scanning electron microscopy (SEM). Hydrogen permeation through the BCN membrane was studied using a high-temperature permeator. The hydrogen permeation fluxes under wet conditions are higher than those under dry conditions, which is due to increased proton concentrations in the H+ hopping via OH groups. The hydrogen permeation increased with increasing hydrogen and steam concentrations in the feed. For a steam concentration of 15 vol.%, the hydrogen permeation flux reaches 0.026 ml/min cm2.

Organisationseinheit(en)
Institut für Physikalische Chemie und Elektrochemie
Externe Organisation(en)
South China University of Technology
Typ
Artikel
Journal
Journal of membrane science
Band
343
Seiten
90-96
Anzahl der Seiten
7
ISSN
0376-7388
Publikationsdatum
01.11.2009
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Biochemie, Allgemeine Materialwissenschaften, Physikalische und Theoretische Chemie, Filtration und Separation
Elektronische Version(en)
https://doi.org/10.1016/j.memsci.2009.07.011 (Zugang: Geschlossen)