In-Situ X-RAY diffraction studies for the LaSrFeO3-Ba(Ce,Zr)O3 cathode composite / Muhammad Adlan Faris Nor Azizan

• Main Author: Nor Azizan, Muhammad Adlan Faris
• Format: Thesis
• Language: English
• Published: 2021
• Subjects: Thermal conductivity; Force and energy
• Online Access: https://ir.uitm.edu.my/id/eprint/49648/1/49648.pdf; https://ir.uitm.edu.my/id/eprint/49648/
• Institution: Universiti Teknologi Mara

Owing to its high-power performance, solid oxide fuel cell (SOFC) is highly efficient in energy production. However, its high operation temperatures ranging from 800℃ to 1000℃ increase the cost which prevents its applications from expanding. Proton conducting fuel cell (PCFC) was developed, as it can work at intermediate temperature ranging from 400℃ to 800℃. Due to reduced activation energy and comparatively elevated proton conductivity at intermediate temperature, PCFC can boost durability and performance. In this study, La0.6Sr0.4Co0.2Fe0.8O3-δ–BaCe0.54Zr0.36Y0.1O3-δ (LSCF-BCZY) was used as composite cathode. By using the Rietveld refinement method, the structure parameters of LSCF-BCZY were determined at different temperatures from room temperature to 700℃, resulting in fulfilment of the phase refinement requirement. The goodness of fit fill the necessity below four. The materials’ XRD shows orthorhombic crystal symmetry for LSCF and cubic crystal symmetry for BCZY with space group Pbnm (the name indicates a primitive lattice with b-glide plane perpendicular to the x-axis, n-glide plane perpendicular to the y-axis and mirror plane perpendicular to the z-axis) and Pm-3m (the name refers a primitive lattice with mirror plane perpendicular to x-axis, y-axis and z-axis, them threefold symmetry of body diagonals), respectively. Other structural studies have been using the Rietveld refinement process, such as space group, lattice parameters and crystal structure. All the properties studied here suggest it may be a promising candidate of cathode at intermediate temperature for PCFC.