Structural and Electrochemical Properties of Lanthanum Silicate Apatites La10Si6- x -0.2AlxZn0.2O27- δfor Solid Oxide Fuel Cells (SOFCs)


Afroze S. Absah H.Q.H.H. Reza M.S. Somalu M.R. Park J.-Y. Nekoonam S. Issakhov A. Azad A.K.
2021Hindawi Limited

International Journal of Chemical Engineering
2021#2021

An excellent oxide ion conductivity with high oxygen transportation of lanthanum silicate apatite at the solid oxide fuel cell (SOFC) can be achieved through the solid-state reaction method. The doped La10Si6-x-0.2AlxZn0.2O27-δ (x = 0.2 and 0.4) materials sintered at 1600°C accomplished crystallinity and crystal structure of apatite-type. The structural and electrochemical characterizations of La10Si6-x-0.2AlxZn0.2O27-δ (x = 0.2 and 0.4) were executed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and electrochemical impedance spectroscopy (EIS) measurements. The total oxide ion conductivities of La10Si6-x-0.2AlxZn0.2O27-δ (x = 0.2 and 0.4) were measured from low to intermediate operating temperature range (450 to 800°C) using electrochemical impedance spectroscopy. Room temperature XRD patterns of La10Si6-x-0.2AlxZn0.2O27-δ (x = 0.2 and 0.4) exhibited La10Si6O27 apatite phase with space group P63/m as the main phase with the minor appearance of La2SiO5 as an impurity phase. The highest total oxide ion conductivity of 3.24 × 10-3 Scm-1 and corresponding activation energy of 0.30 eV at 800°C were obtained for La10Si5.6Al0.2Zn0.2O26.7 which contains a low concentration of Al3+ dopant.



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Faculty of Integrated Technologies, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, Bandar Seri Begawan, BE 1410, Brunei Darussalam
Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, Bandar Seri Begawan, BE 1410, Brunei Darussalam
Faculty of Science, Universiti Kebangsaan Malaysia, Bangi, Selangor, X 43600, Malaysia
Department of Nanoscience and Advanced Materials Engineering, Sejong University, HMC, 209 Neungdong-ro, Gunja-dong, Gwangjin-gu, Seoul, 05006, South Korea
Department of Renewable Energies and Environment, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
Faculty of Mechanics and Mathematics, Department of Mathematical and Computer Modelling, Al-Farabi Kazakh National University, Almaty, Kazakhstan

Faculty of Integrated Technologies
Faculty of Science
Faculty of Science
Department of Nanoscience and Advanced Materials Engineering
Department of Renewable Energies and Environment
Faculty of Mechanics and Mathematics

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