Synthesis of nano-crystalline apatite type electrolyte powders for solid oxide fuel cells |
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| Authors: | E Jothinathan K Vanmeensel J Vleugels O Van der Biest |
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| Affiliation: | 1. Laboratory of Industrial Chemistry, National School of Engineering of Sfax, BP 1173, Sfax 3038, Tunisia;2. Preparatory Institute for Engineering Studies of Monastir, Monastir 5019, Tunisia;3. Laboratory of Materials and Crystallochemistry, Preparatory Institute for Engineering Studies of Nabeul, Nabeul 8000, Tunisia;1. U.R. Matériaux et synthèse organique UR17ES31, Institut Préparatoire aux Etudes d''Ingénieur de Monastir, Université de Monastir, Monastir, 5019, Tunisia;2. Laboratoire des Interfaces et Matériaux Avancés, Faculté des Sciences de Monastir, Boulevard de l''Environnement, Université de Monastir, Monastir, 5019, Tunisia;3. Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire, Paris, F-75005, France;4. Laboratoire de Chimie Physique Générale, Université Mohammed V, Av. Ibn Batouta, Rabat, BP1014, Morocco;1. College of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, PR China;2. Hebei Province Key Laboratory of Photocatalytic and Electrocatalytic Materials for Environment, Tangshan 063009, PR China;1. Chemical Engineering College, Hebei Normal University of Science and Technology, Qinhuangdao, 066600, China;2. Key Laboratory of Advance Energy Materials Chemstry (Minstry of Education), Nankai University, Tianjin, 300071, China |
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| Abstract: | Rare earth silicates with apatite structure are being actively studied as an alternative electrolyte material for solid oxide fuel cells (SOFC) operating in the intermediate temperature range. In this paper we report on the synthesis of La9.33+x/3AlxSi6?xO26+δ (with x = 0–1.5) and La9.83Fe1.5Si4.5O26 powders using a modified sol–gel process. The parameters involved in the process have been optimized for preparing phase pure, homogeneous and nanometer sized powders. The obtained powders were characterized using scanning electron microscopy, X-ray diffraction and thermal analysis. Pressureless sintering experiments were performed and pellets having relative densities greater than 96% could be obtained after 5 h dwelling in the temperature range between 1500 and 1550 °C. |
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