Preparation of Nanoparticle Core−Shell Electrolyte Materials for Proton Ceramic Fuel Cells

作者：Zohreh Khani, Mélanie Taillades-Jacquin, Gilles Taillades, Deborah J. Jones, Mathieu Marrony, Jacques Rozière · 发表于：Chemistry of Materials · 年份：2010 · DOI：10.1021/cm9022908 · 被引用次数：28 · 研究领域：Advancements in Solid Oxide Fuel Cells、Fuel Cells and Related Materials、Electronic and Structural Properties of Oxides

The sinterability of yttrium-doped barium zirconate (BZY) has been improved through an original synthesis approach giving a core−shell type arrangement in which nanoparticulate BZY is enrobed by a thin coating of yttrium-doped barium cerate (BCY). A flash combustion route was first used to prepare BZY10 (10% yttrium-doped) in a nanopowder form with average particle diameter of 12−17 nm. The nanoparticles were then dispersed in a hydrogel generated from 3,3′,3′′-nitrilotripropionic acid complexed metal (yttrium, barium, cerium) acrylates. After thermal elimination of the organic moieties, a material of novel macroscopic architecture is obtained, which can be densified (apparent density ≥ 97%) by sintering compacted pellets at 1300 °C for 10 h, i.e. some 200 °C lower than is generally used to densify BZY. X-ray diffraction indicates that two phases corresponding to BCY10 and BZY10 are present and that no discernible migration of atoms occurs between the zirconate core and the cerate shell. Proton conductivities of densified pellets were determined in a moist nitrogen atmosphere in the range 300−600 °C using impedance spectroscopy. The total conductivity is in the range 4.1 × 10 −4 S/cm (300 °C)−9.5 × 10 −3 S/cm (600 °C), which is an order of magnitude higher than that of BZY10, prepared under equivalent conditions and the core−shell material displayed improved stability against carbonate formation in a CO 2 atmosphere. The densification, proton conductivity, and CO 2 uptake pro...