Lattice expansion and crystallite size analysis of 50NiO-50BaC0.54Z0.36Y0.1O3-δ anode composite for proton ceramic fuel cells application / Munirah Shafiqah Murat

• Main Author: Murat, Munirah Shafiqah
• Format: Thesis
• Language: English
• Published: 2022
• Subjects: Carbon disulfide. Graphene. Carbon; Physical and theoretical chemistry
• Online Access: https://ir.uitm.edu.my/id/eprint/71330/1/71330.pdf; https://ir.uitm.edu.my/id/eprint/71330/

This study reports on the structured analyses of 50NiO-50BCZY anode composite materials that is an essential element in proton ceramic fuel cells (PCFCs) aplication. Knowledge about the best materials used for anode composite is needed in order to enhance the performance of the PCFCs. Hence, study on anode lattice expansion is critical to ensure that each component has close thermal expansion coefficients under the desired working conditions. Recent study has discovered some problems occurs such as fracture formation caused by thermal mismatch between anode layers. Besides that, in order to understand the properties of anode composite materials, crystallite size must be determined appropriately. In this work, product of sintered NiO-BCZY anode composite is developed to understand the properties of the anode materials. Two objectives were carried out which is to investigate the lattice expansion 50NiO:50BCZY anode composite by using High Temperature XRD (HT-XRD) at operating temperature from room temperature until 700 °C, and to calculate the crystallite size for 50NiO:50BCZY anode composite by using Scherrer’s and Williamson Hall’s methods. The results obtained revealed that the diffraction peaks of NiO and BCZY were matched with the cubic phase perovskite structure where the lattice parameter for NiO is (a=b=c =4.1695 Å) and BCZY is (a=b=c = 4.3170 Å). Other than that, the unit cell volume for NiO is 72.49 Å3 and BCZY is 80.46 Å3. The observation also shows that the lattice expansion is increasing with the temperature. The result obtained from the analysis, it shows that the crystallite size is also strongly correlated with the lattice expansion where it is proved that the crystallite size is increased when the temperature is increased.